N-CSR

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D. C. 20549

FORM N-CSR

Investment Company Act file number 811-05970

Cash Account Trust

(Exact Name of Registrant as Specified in Charter)

345 Park Avenue

New York, NY 10154-0004

(Address of Principal Executive Offices) (Zip Code)

Registrant’s Telephone Number, including Area Code: (212) 454-7190

Paul Schubert

345 Park Avenue

New York, NY 10154-0004

(Name and Address of Agent for Service)

Date of fiscal year end: 4/30

Date of reporting period: 4/30/2010

ITEM 1. REPORT TO STOCKHOLDERS

APRIL 30, 2010

Annual Report
to Shareholders

Government & Agency Securities Portfolio

DWS Government Cash Institutional SharesFund #250

Government Cash Managed SharesFund #254

Contents

3 Portfolio Management Review

6 Information About Your Portfolio's Expenses

8 Portfolio Summary

9 Investment Portfolio

14 Financial Statements

18 Financial Highlights

20 Notes to Financial Statements

28 Report of Independent Registered Public Accounting Firm

29 Tax Information

30 Summary of Management Fee Evaluation by Independent Fee Consultant

35 Board Members and Officers

This report must be preceded or accompanied by a prospectus. To obtain a summary prospectus, if available, or prospectus for any of our funds, visit www.dws-investments.com. We advise you to consider the fund's objectives, risks, charges and expenses carefully before investing. The summary prospectus and prospectus contain this and other important information about the fund. Please read the prospectus carefully before you invest.

An investment in the Portfolio is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. Although the Portfolio seeks to preserve the value of your investment at $1.00 per share, this share price isn't guaranteed and you could lose money by investing in the Portfolio. The share price of money market funds can fall below the $1.00 share price. You should not rely on or expect the Advisor to enter into support agreements or take other actions to maintain the Portfolio's $1.00 share price. The credit quality of the Portfolio's holdings can change rapidly in certain markets, and the default of a single holding could have an adverse impact on the Portfolio's share price. The Portfolio's share price can also be negatively affected during periods of high redemption pressures and/or illiquid markets. The actions of a few large investors in one class of shares of the Portfolio may have a significant adverse effect on the share prices of all classes of shares of the Portfolio. See the prospectus for specific details regarding the Portfolio's risk profile.

The Portfolio's policies and procedures for voting proxies for portfolio securities and information about how the Portfolio voted proxies related to its portfolio securities during the 12-month period ended June 30 are available on our Web site — www.dws-investments.com (click on "proxy voting"at the bottom of the page) — or on the SEC's Web site — www.sec.gov. To obtain a written copy of the Portfolio's policies and procedures without charge, upon request, call us toll free at (800) 621-1048.

DWS Investments is part of Deutsche Bank's Asset Management division and, within the US, represents the retail asset management activities of Deutsche Bank AG, Deutsche Bank Trust Company Americas, Deutsche Investment Management Americas Inc. and DWS Trust Company.

NOT FDIC/NCUA INSURED NO BANK GUARANTEE MAY LOSE VALUE NOT A DEPOSIT NOT INSURED BY ANY FEDERAL GOVERNMENT AGENCY

Portfolio Management Review

Market Overview

The views expressed in the following discussion reflect those of the portfolio management team only through the end of the period of the report as stated on the cover. The management team's views are subject to change at any time based on market and other conditions and should not be construed as a recommendation. Past performance is no guarantee of future results. Current and future portfolio holdings are subject to risk.

During 2009, it became increasingly clear that a series of unprecedented initiatives by the US Federal Reserve Board (the Fed) and the US Treasury had markedly improved investor sentiment and the overall tone of the financial markets. Liquidity was gradually restored in the short end of the money market yield curve as yield spreads returned to more accustomed levels and credit markets functioned more efficiently.^1,2 In line with the recovery in the markets in 2009, short-term interest rates declined steadily and substantially. The US economy continued to improve as we saw the beginnings of a turnaround for employment, consumer confidence and the housing market.

At the end of the first quarter of 2010, the money market yield curve began to change configuration as — for the first time in 12 months — short-term money market rates rose across the board. The increase in rates came largely in response to Congress' raising of the nation's debt ceiling and political and budgetary concerns within the Eurozone, especially in Greece.³ The rise in money market yields was fairly slight, but it seemed to many observers that these rates — which had been extremely low for an extended period — were normalizing somewhat.

Positive Contributors to Portfolio Performance

We were able to maintain a competitive yield for the Government & Agency Securities Portfolio during the period. (All performance is historical and does not guarantee future results. Yields fluctuate and are not guaranteed.)

We have been maintaining an increased focus on overnight repurchase agreements as overnight yields have risen somewhat and firmed up. We have held off on extending maturity within the Portfolio until the direction of short-term rates becomes clearer.

Negative Contributors to Portfolio Performance

The types of securities that we were investing in tended to have lower yields than issues carrying more risk. We preferred to be cautious during a time of market uncertainty. In the end, this cost the Portfolio some yield, but we believe that this represented a prudent approach to preserving principal.

Outlook and Positioning

Though money market yields have risen slightly in the first four months of 2010, we continue to foresee an artificially low interest rate environment in the near term because of declining money market supply and a large number of money market issues maturing with principal needing to be reinvested. The market is awaiting the removal of the "extended period" (of near-zero short-term rates) language from the Federal Open Market Committee's public statements for a clear signal that the Fed's rate policy is changing in response to an improving US economy.

Another factor that should influence yield levels going forward is the amendments to the money market rules (Rule 2a-7) by the Securities & Exchange Commission (SEC) being phased in from May through December 2010. The amendments cover a number of areas, including portfolio average maturity, liquidity requirements and portfolio operations. We believe that these regulations will tend to steepen the money market yield curve (i.e., steadily higher yields for longer maturities) as more funds maintain shorter average maturity in line with the amendments.

We continue our insistence on the highest credit quality within the portfolio.⁴ We currently plan to maintain our conservative investment strategies and standards. We continue to apply a careful approach to investing and to seek competitive yield for our shareholders.

Portfolio Performance (as of April 30, 2010)

Performance is historical and does not guarantee future results. Current performance may be lower or higher than the performance data quoted.

An investment in a money market fund is not insured or guaranteed by the FDIC or any other government agency. Although money market funds seek to preserve the value of your investment at $1.00 per share, this share price isn't guaranteed and you could lose money by investing in money market funds. The share price of money market funds can fall below the $1.00 share price. You should not rely on or expect the Advisor to enter into support agreements or take other actions to maintain the Portfolio's $1.00 share price. The credit quality of the Portfolio's holdings can change rapidly in certain markets, and the default of a single holding could have an adverse impact on the Portfolio's share price. The Portfolio's share price can also be negatively affected during periods of high redemption pressures and/or illiquid markets. The actions of a few large investors in one class of shares of a Portfolio may have a significant adverse effect on the share prices of all classes of shares of that Portfolio.

	7-Day Current Yield
DWS Government Cash Institutional Shares	.05%*
Government Cash Managed Shares	.01%*
Yields are historical, will fluctuate and do not guarantee future performance. The 7-day current yield refers to the income paid by the portfolio over a 7-day period expressed as an annual percentage rate of the portfolio's shares outstanding. For the most current yield information, visit our Web site at www.dws-investments.com. * The investment advisor has agreed to voluntarily waive fees/reimburse expenses. This waiver may be changed or terminated at any time without notice. Otherwise, the 7-day current yield would have been 0.05% and -0.14% for DWS Government Cash Institutional Shares and Government Cash Managed Shares, respectively, as of April 30, 2010.

¹ "Spread" refers to the excess yield various fixed-income or money market securities or sectors offer over each other at similar maturities. When spreads widen, yield differences are increasing between securities in the two sectors being compared. When spreads narrow, the opposite is true.

² The yield curve is a graphical representation of how yields on bonds of different maturities compare. Normally, yield curves slant up, as bonds with longer maturities typically offer higher yields than short-term bonds.

³ The Eurozone refers to a currency union among the European Union member states that have adopted the euro as their sole currency.

⁴ Credit quality is a measure of a bond issuer's ability to repay interest and principal in a timely manner. Rating agencies assign letter designations such as AAA, AA and so forth. The lower the rating, the higher the probability of default.

Information About Your Portfolio's Expenses

As an investor of the Portfolio, you incur two types of costs: ongoing expenses and transaction costs. Ongoing expenses include management fees, distribution and service (12b-1) fees and other Portfolio expenses. Examples of transaction costs include account maintenance fees, which are not shown in this section. The following tables are intended to help you understand your ongoing expenses (in dollars) of investing in the Portfolio and to help you compare these expenses with the ongoing expenses of investing in other mutual funds. In the most recent six-month period, the Portfolio limited these expenses; had it not done so, expenses would have been higher for the DWS Government Cash Institutional Shares and the Government Cash Managed Shares. The example in the table is based on an investment of $1,000 invested at the beginning of the six-month period and held for the entire period (November 1, 2009 to April 30, 2010).

The tables illustrate your Portfolio's expenses in two ways:

• Actual Portfolio Return. This helps you estimate the actual dollar amount of ongoing expenses (but not transaction costs) paid on a $1,000 investment in each Portfolio using each Portfolio's actual return during the period. To estimate the expenses you paid over the period, simply divide your account value by $1,000 (for example, an $8,600 account value divided by $1,000 = 8.6), then multiply the result by the number in the "Expenses Paid per $1,000" line under the share class you hold.

• Hypothetical 5% Portfolio Return. This helps you to compare each Portfolio's ongoing expenses (but not transaction costs) with those of other mutual funds using each Portfolio's actual expense ratio and a hypothetical rate of return of 5% per year before expenses. Examples using a 5% hypothetical fund return may be found in the shareholder reports of other mutual funds. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period.

Please note that the expenses shown in these tables are meant to highlight your ongoing expenses only and do not reflect any transaction costs. The "Expenses Paid per $1,000" line of the tables is useful in comparing ongoing expenses only and will not help you determine the relative total expense of owning different funds. If these transaction costs had been included, your costs would have been higher.

Expenses and Value of a $1,000 Investment for the six months ended April 30, 2010
Actual Portfolio Return	DWS Government Cash Institutional Shares	Government Cash Managed Shares
Beginning Account Value 11/1/09	$ 1,000.00	$ 1,000.00
Ending Account Value 4/30/10	$ 1,000.41	$ 1,000.09
Expenses Paid per $1,000*	$ .94	$ 1.29
Hypothetical 5% Portfolio Return
Beginning Account Value 11/1/09	$ 1,000.00	$ 1,000.00
Ending Account Value 4/30/10	$ 1,023.85	$ 1,023.51
Expenses Paid per $1,000*	$ .95	$ 1.30

^*Expenses are equal to the Portfolio's annualized expense ratio, multiplied by the average account value over the period, multiplied by the number of days in the most recent six-month period, then divided by 365.

Annualized Expense Ratios
DWS Government Cash Institutional Shares	.19%
Government Cash Managed Shares	.26%

For more information, please refer to the Portfolio's prospectus.

Portfolio Summary

Government & Agency Securities Portfolio

Asset Allocation (As a % of Investment Portfolio)	4/30/10	4/30/09
Government & Agency Obligations	85%	46%
Repurchase Agreements	15%	54%
	100%	100%

Weighted Average Maturity	4/30/10	4/30/09
Cash Account Trust — Government & Agency Securities Portfolio	52 days	56 days
iMoneyNet Government & Agencies Retail Money Fund Average*	45 days	44 days

* The Portfolio is compared to its respective iMoney Net Category: Government & Agencies Retail Money Fund Average consists of all non-institutional government money market funds. Category includes the most broadly based of the government retail funds. These funds can invest in US Treasuries, US Other, Repos, whether or not they are backed by US Treasuries and government-backed Floating Rate Notes.

Weighted average maturity, also known as effective maturity, is the weighted average of the bonds held by the Portfolio taking into consideration any maturity shortening features.

Asset allocation and weighted average maturity are subject to change.

For more complete details about the Portfolio's holdings, see pages 9-13. A quarterly Fact Sheet is available upon request.

Following the Portfolio's fiscal first and third quarter-end, a complete portfolio holdings listing is filed with the SEC on Form N-Q. The form will be available on the SEC's Web site at www.sec.gov, and it also may be reviewed and copied at the SEC's Public Reference Room in Washington, D.C. Information on the operation of the SEC's Public Reference Room may be obtained by calling (800) SEC-0330. A complete list of the Portfolio's holdings is also posted on www.dws-investments.com from time to time. Please see the Portfolio's current prospectus for more information.

Investment Portfolio as of April 30, 2010

Government & Agency Securities Portfolio

		Principal Amount ($)	Value ($)
Government & Agency Obligations 85.0%
US Government Sponsored Agencies 79.0%
Federal Farm Credit Bank:
	0.038%**, 12/17/2010	25,000,000	24,993,396
	0.17%**, 6/7/2011	45,000,000	44,979,937
	0.18%**, 8/26/2010	50,000,000	49,998,269
	0.19%**, 11/4/2010	92,000,000	92,000,000
	0.191%**, 12/23/2010	50,000,000	49,998,019
	0.2%**, 6/21/2011	50,000,000	50,000,000
	0.219%**, 2/4/2011	75,000,000	74,970,982
	0.223%**, 2/14/2011	140,000,000	139,955,321
	0.23%**, 5/25/2011	50,000,000	50,000,000
	0.249%**, 7/6/2010	60,000,000	60,003,324
	0.263%**, 8/25/2010	50,000,000	50,004,826
	0.265%**, 2/28/2011	50,000,000	50,004,352
	0.265%**, 3/28/2011	40,000,000	39,985,447
	0.276%**, 1/20/2011	94,655,000	94,654,909
	0.276%*, 5/3/2010	50,000,000	49,998,889
	0.39%, 12/1/2010	68,500,000	68,500,000
	0.496%**, 1/20/2011	200,000,000	200,307,355
	0.511%**, 12/23/2010	70,000,000	70,100,892
	2.75%, 5/4/2010	195,750,000	195,781,375
Federal Home Loan Bank:
	0.048%*, 5/3/2010	10,631,000	10,630,965
	0.07%**, 11/17/2010	229,225,000	229,209,941
	0.101%**, 11/19/2010	350,000,000	349,961,296
	0.163%**, 7/15/2011	220,000,000	219,865,260
	0.18%, 5/4/2010	15,000,000	14,999,936
	0.184%**, 1/14/2011	100,000,000	100,000,000
	0.198%**, 7/13/2010	25,000,000	25,010,385
	0.23%**, 5/26/2011	392,000,000	392,000,000
	0.25%, 12/21/2010	16,000,000	15,990,099
	0.31%**, 7/9/2010	250,000,000	250,000,000
	0.39%**, 11/15/2010	170,000,000	169,986,029
	0.4%, 1/4/2011	32,800,000	32,796,573
	0.45%, 10/28/2010	10,000,000	10,008,258
	0.5%, 11/12/2010	45,000,000	45,005,501
	0.5%, 12/28/2010	41,300,000	41,300,000
	0.55%, 6/3/2010	88,900,000	88,900,000
	0.55%, 6/4/2010	50,000,000	50,000,000
	0.95%, 2/3/2011	33,770,000	33,898,887
	1.25%, 10/14/2010	71,340,000	71,635,457
	4.25%, 6/11/2010	5,370,000	5,394,050
	4.375%, 10/22/2010	17,625,000	17,966,135
Federal Home Loan Mortgage Corp.:
	0.094%**, 5/10/2011	200,000,000	200,000,000
	0.168%*, 5/3/2010	100,000,000	99,998,611
	0.168%*, 7/19/2010	32,400,000	32,387,913
	0.183%*, 8/24/2010	11,500,000	11,493,204
	0.188%*, 7/13/2010	25,000,000	24,990,368
	0.194%**, 7/12/2010	39,434,000	39,436,409
	0.197%*, 7/9/2010	90,000,000	89,965,500
	0.198%*, 7/23/2010	100,000,000	99,953,889
	0.198%*, 8/17/2010	45,000,000	44,973,000
	0.208%*, 8/13/2010	48,600,000	48,570,516
	0.208%*, 8/20/2010	42,000,000	41,972,805
	0.208%*, 8/24/2010	50,000,000	49,966,458
	0.228%*, 9/1/2010	60,000,000	59,952,850
	0.237%*, 7/12/2010	25,000,000	24,988,000
	0.278%*, 9/27/2010	48,334,000	48,277,986
	0.279%*, 10/26/2010	50,000,000	49,930,778
	0.329%*, 12/7/2010	18,800,000	18,762,087
	0.378%*, 10/25/2010	34,850,000	34,784,889
	0.388%**, 1/28/2011	45,000,000	45,055,516
	0.407%*, 5/17/2010	50,000,000	49,990,444
	2.375%, 5/28/2010	18,750,000	18,779,945
	2.875%, 6/28/2010	117,280,000	117,763,334
	2.875%, 11/23/2010	14,935,000	15,148,418
	3.75%, 7/30/2010	25,050,000	25,243,862
	4.125%, 7/12/2010	88,919,000	89,554,028
	4.125%, 10/18/2010	31,259,000	31,795,102
	4.75%, 10/4/2010	25,000,000	25,476,897
	4.75%, 12/8/2010	8,960,000	9,198,129
	5.125%, 8/23/2010	15,000,000	15,226,149
	6.875%, 9/15/2010	18,000,000	18,441,162
Federal National Mortgage Association:
	0.072%*, 5/4/2010	50,000,000	49,999,604
	0.185%*, 6/1/2010	135,000,000	134,977,912
	0.188%**, 7/13/2010	220,000,000	220,066,477
	0.199%**, 8/5/2010	164,000,000	164,084,014
	0.248%*, 9/1/2010	57,396,000	57,346,974
	0.248%*, 10/1/2010	100,000,000	99,893,750
	0.309%*, 12/20/2010	45,000,000	44,909,713
	0.328%*, 9/20/2010	85,000,000	84,889,358
	0.408%*, 11/15/2010	63,500,000	63,356,808
	0.437%*, 6/1/2010	45,000,000	44,982,562
	0.524%*, 7/26/2010	25,000,000	24,968,347
	0.525%*, 8/2/2010	25,000,000	24,965,771
	0.544%*, 8/5/2010	50,000,000	49,926,667
	2.875%, 10/12/2010	38,235,000	38,679,722
	3.0%, 7/12/2010	12,750,000	12,811,072
	7.125%, 6/15/2010	18,548,000	18,704,923
			6,247,437,988
US Treasury Obligations 6.0%
US Treasury Bills:
	0.49%*, 7/29/2010	15,000,000	14,981,829
	0.5%*, 7/29/2010	10,000,000	9,987,639
	0.53%*, 6/3/2010	31,350,000	31,334,769
	0.6%*, 6/3/2010	75,000,000	74,958,750
US Treasury Notes:
	1.5%, 10/31/2010	101,200,000	101,757,182
	2.375%, 8/31/2010	50,000,000	50,333,731
	2.75%, 7/31/2010	131,000,000	131,770,803
	2.875%, 6/30/2010	31,850,000	31,976,345
	4.5%, 11/15/2010	25,000,000	25,559,202
			472,660,250
Total Government & Agency Obligations (Cost $6,720,098,238)			6,720,098,238
Repurchase Agreements 14.9%
Banc of America Securities LLC, 0.2% dated 4/30/2010, to be repurchased at $249,967,861 on 5/3/2010 (a)		249,963,695	249,963,695
BNP Paribas, 0.2% dated 4/30/2010, to be repurchased at $200,003,333 on 5/3/2010 (b)		200,000,000	200,000,000
JPMorgan Securities, Inc., 0.19% dated 4/30/2010, to be repurchased at $100,001,583 on 5/3/2010 (c)		100,000,000	100,000,000
Morgan Stanley & Co., Inc., 0.19% dated 4/30/2010, to be repurchased at $350,005,542 on 5/3/2010 (d)		350,000,000	350,000,000
The Goldman Sachs & Co., 0.19% dated 4/30/2010, to be repurchased at $274,004,338 on 5/3/2010 (e)		274,000,000	274,000,000
Total Repurchase Agreements (Cost $1,173,963,695)			1,173,963,695

	% of Net Assets	Value ($)
Total Investment Portfolio (Cost $7,894,061,933)+	99.9	7,894,061,933
Other Assets and Liabilities, Net	0.1	8,337,776
Net Assets	100.0	7,902,399,709

* Annualized yield at time of purchase; not a coupon rate.

** These securities are shown at their current rate as of April 30, 2010. Floating rate securities' yields vary with a designated market index or market rate, such as the coupon-equivalent of the US Treasury bill rate.

⁺The cost for federal income tax purposes was $7,894,061,933.

(a) Collateralized by:

Principal Amount ($)	Security	Rate (%)	Maturity Date	Collateral Value ($)
54,000,000	Federal Farm Credit Bank	0.1-0.243	11/17/2010- 1/15/2013	53,849,700
79,458,000	Federal Home Loan Bank	0.13-0.198	5/3/2010- 5/13/2011	79,455,592
7,454,000	Federal Home Loan Mortgage Corp.	0.19-5.875	1/28/2011- 6/27/2016	7,849,245
16,549,000	Federal Home Loan Mortgage Corp. STRIPS	Zero Coupon	3/15/2013- 7/15/2023	12,673,208
272,100,000	Federal National Mortgage Association STRIPS	Zero Coupon	11/15/2011-11/15/2030	101,135,947
Total Collateral Value				254,963,692

(b) Collateralized by:

Principal Amount ($)	Security	Rate (%)	Maturity Date	Collateral Value ($)
90,460,400	US Treasury Bill	—	10/14/2010	90,367,226
105,140,700	US Treasury Notes	1.875-4.25	2/28/2014- 8/15/2014	113,632,812
Total Collateral Value				204,000,038

(c) Collateralized by $100,046,433 Government National Mortgage Association, 4.5%, with various maturity dates of 6/15/2039-2/15/2040 with a value of $102,000,458.

(d) Collateralized by:

Principal Amount ($)	Security	Rate (%)	Maturity Date	Collateral Value ($)
47,459,446	Federal Home Loan Mortgage Corp.	5.0	6/1/2025- 4/1/2040	49,387,453
297,663,730	Federal National Mortgage Association	3.866-5.0	1/1/2035- 2/1/2040	307,627,817
Total Collateral Value				357,015,270

(e) Collateralized by:

Principal Amount ($)	Security	Rate (%)	Maturity Date	Collateral Value ($)
30,123,602	Federal Home Loan Mortgage Corp.	5.0	1/15/2034	30,060,132
26,111,613	Federal National Mortgage Association	4.5	10/25/2039	25,997,662
324,006,874	Federal National Mortgage Association — Interest Only	5.0-6.202	11/25/2038- 5/25/2040	71,131,388
186,869,025	Federal National Mortgage Association — Principal Only	Zero Coupon	7/25/2039- 5/25/2040	152,290,818
Total Collateral Value				279,480,000

Interest Only: Interest Only (IO) bonds represent the "interest only" portion of payments on a pool of underlying mortgages or mortgage-backed securities. IO securities are subject to prepayment risk of the pool of underlying mortgages.

Principal Only: Principal Only (PO) bonds represent the "principal only" portion of payments on a pool of underlying mortgages or mortgage-backed securities.

STRIPS: Separate Trading of Registered Interest and Principal Securities

Fair Value Measurements

Various inputs are used in determining the value of the Portfolio's investments. These inputs are summarized in three broad levels. Level 1 includes quoted prices in active markets for identical securities. Level 2 includes other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds and credit risk). Level 3 includes significant unobservable inputs (including the Portfolio's own assumptions in determining the fair value of investments). The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities. Most securities held by a money market fund are reflected as Level 2 because the securities are valued at amortized cost (which approximates fair value) and, accordingly, the inputs used to determine value are not quoted prices in an active market.

The following is a summary of the inputs used as of April 30, 2010 in valuing the Portfolio's investments. For information on the Portfolio's policy regarding the valuation of investments, please refer to the Security Valuation section of Note A in the accompanying Notes to Financial Statements.

Assets	Level 1	Level 2	Level 3	Total
Government & Agency Obligations (f)	$ —	$ 6,720,098,238	$ —	$ 6,720,098,238
Repurchase Agreements	—	1,173,963,695	—	1,173,963,695
Total	$ —	$ 7,894,061,933	$ —	$ 7,894,061,933

(f) See Investment Portfolio for additional detailed categorizations.

The accompanying notes are an integral part of the financial statements.

Financial Statements

Government & Agency Securities Portfolio

Statement of Assets and Liabilities as of April 30, 2010
Assets	Government & Agency Securities Portfolio
Investments: Investments in securities, at value (cost $6,720,098,238)	$ 6,720,098,238
Repurchase agreements, at value (cost $1,173,963,695)	1,173,963,695
Total investments, at value (cost $7,894,061,933)	7,894,061,933
Cash	23,760
Receivable for Portfolio shares sold	243,841
Interest receivable	10,239,908
Other assets	326,581
Total assets	7,904,896,023
Liabilities
Payable for Portfolio shares redeemed	149,518
Distributions payable	175,324
Accrued management fee	607,726
Other accrued expenses and payables	1,563,746
Total liabilities	2,496,314
Net assets, at value	$ 7,902,399,709
Net Assets Consist of
Undistributed net investment income	191,341
Paid-in capital	7,902,208,368
Net assets, at value	$ 7,902,399,709

The accompanying notes are an integral part of the financial statements.

Statement of Assets and Liabilities as of April 30, 2010 (continued)
Net Asset Value	Government & Agency Securities Portfolio
Capital Assets Funds Shares Net Asset Value, offering and redemption price per share ($304,007,321 ÷ 303,984,612 outstanding shares of beneficial interest, no par value, unlimited number of shares authorized)	$ 1.00
Davidson Cash Equivalent Shares Net Asset Value, offering and redemption price per share ($19,904,663 ÷ 19,899,712 outstanding shares of beneficial interest, no par value, unlimited number of shares authorized)	$ 1.00
Davidson Cash Equivalent Plus Shares Net Asset Value, offering and redemption price per share ($50,235,972 ÷ 50,233,853 outstanding shares of beneficial interest, no par value, unlimited number of shares authorized)	$ 1.00
DWS Government & Agency Money Fund Net Asset Value, offering and redemption price per share ($232,512,614 ÷ 232,468,777 outstanding shares of beneficial interest, no par value, unlimited number of shares authorized)	$ 1.00
DWS Government Cash Institutional Shares Net Asset Value, offering and redemption price per share ($6,899,491,813 ÷ 6,899,325,406 outstanding shares of beneficial interest, no par value, unlimited number of shares authorized)	$ 1.00
Government Cash Managed Shares Net Asset Value, offering and redemption price per share ($279,676,061 ÷ 279,728,507 outstanding shares of beneficial interest, no par value, unlimited number of shares authorized)	$ 1.00
Service Shares Net Asset Value, offering and redemption price per share ($116,571,265 ÷ 116,549,753 outstanding shares of beneficial interest, no par value, unlimited number of shares authorized)	$ 1.00

The accompanying notes are an integral part of the financial statements.

Statement of Operations for the year ended April 30, 2010
Investment Income	Government & Agency Securities Portfolio
Income: Interest	$ 51,331,736
Expenses: Management fee	8,440,243
Administration fee	15,592,791
Services to shareholders	6,380,877
Custodian fee	473,383
Distribution and service fees	11,854,020
Professional fees	283,953
Trustees' fees and expenses	446,670
Reports to shareholders	575,342
Registration fees	308,262
Temporary guarantee program participation fee	1,862,809
Other	395,441
Total expenses before expense reductions	46,613,791
Expense reductions	(13,561,213)
Total expenses after expense reductions	33,052,578
Net investment income	18,279,158
Net realized gain (loss) from investments	683,254
Net increase (decrease) in net assets resulting from operations	$ 18,962,412

The accompanying notes are an integral part of the financial statements.

Statement of Changes in Net Assets	Government & Agency Securities Portfolio
	Years Ended April 30,
	2010	2009
Operations: Net investment income	$ 18,279,158	$ 104,309,706
Net realized gain (loss)	683,254	1,341,684
Net increase in net assets resulting from operations	18,962,412	105,651,390
Distributions to shareholders from: Net investment income: Capital Assets Funds Shares	(30,842)	(1,539,073)
Davidson Cash Equivalent Shares	(2,419)	(260,593)
Davidson Cash Equivalent Plus Shares	(3,042)	(256,560)
DWS Government & Agency Money Fund	(168,152)	(5,640,482)
DWS Government Cash Institutional Shares	(17,853,361)	(64,506,953)
Government Cash Managed Shares	(46,318)	(4,499,492)
Premier Money Market Shares	(176,438)	(26,628,276)
Service Shares	(13,091)	(1,083,854)
Net realized gains: Capital Assets Funds Shares	(34,871)	—
Davidson Cash Equivalent Shares	(2,710)	—
Davidson Cash Equivalent Plus Shares	(2,843)	—
DWS Government & Agency Money Fund	(32,168)	—
DWS Government Cash Institutional Shares	(1,560,440)	—
Government Cash Managed Shares	(38,058)	—
Premier Money Market Shares	(242,870)	—
Service Shares	(14,378)	—
Total distributions	(20,222,001)	(104,415,283)
Portfolio share transactions: Proceeds from shares sold	89,328,240,895	58,073,815,617
Reinvestment of distributions	9,173,740	73,218,265
Cost of shares redeemed	(101,467,650,200)	(43,392,972,552)
Net increase (decrease) in net assets from Portfolio share transactions	(12,130,235,565)	14,754,061,330
Increase (decrease) in net assets	(12,131,495,154)	14,755,297,437
Net assets at beginning of period	20,033,894,863	5,278,597,426
Net assets at end of period (including undistributed net investment income of $191,341 and $109,246, respectively)	$ 7,902,399,709	$ 20,033,894,863

The accompanying notes are an integral part of the financial statements.

Financial Highlights

Government & Agency Securities Portfolio DWS Government Cash Institutional Shares
Years Ended April 30,	2010	2009	2008	2007a
Selected Per Share Data
Net asset value, beginning of period	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Income (loss) from investment operations: Net investment income	.001	.015	.044	.010
Net realized and unrealized gain (loss)	.000***	.000***	.000***	.000***
Total from investment operations	.001	.015	.044	.010
Less distributions from: Net investment income	(.001)	(.015)	(.015)	(.010)
Net realized gains	(.000)***	—	—	—
Total distributions	(.001)	(.015)	(.015)	(.010)
Net asset value, end of period	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Total Return (%)b	.14	1.49	4.51	1.04**
Ratios to Average Net Assets and Supplemental Data
Net assets, end of period ($ millions)	6,899	14,646	1,156	325
Ratio of expenses before expense reductions (%)	.19	.21	.23	.24*
Ratio of expenses after expense reductions (%)	.18	.20	.21	.23*
Ratio of net investment income (%)	.14	.94c	4.24	5.12*
a For the period from February 16, 2007 (commencement of operations) to April 30, 2007. b Total return would have been lower had certain expenses not been reduced. c Due to the timing of the subscriptions and redemptions, the amount shown does not correspond to the total return during the period. * Annualized ** Not annualized *** Amount is less than $.0005.

Government & Agency Securities Portfolio Government Cash Managed Shares
Years Ended April 30,	2010	2009	2008	2007a
Selected Per Share Data
Net asset value, beginning of period	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Income (loss) from investment operations: Net investment income	.000***	.013	.042	.010
Net realized and unrealized gain (loss)	.000***	.000***	.000***	.000***
Total from investment operations	.000***	.013	.042	.010
Less distributions from: Net investment income	(.000)***	(.013)	(.042)	(.010)
Net realized gains	(.000)***	—	—	—
Total distributions	(.000)***	(.013)	(.042)	(.010)
Net asset value, end of period	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Total Return (%)b	.02	1.27	4.27	.99**
Ratios to Average Net Assets and Supplemental Data
Net assets, end of period ($ millions)	280	477	379	137
Ratio of expenses before expense reductions (%)	.42	.44	.44	.47*
Ratio of expenses after expense reductions (%)	.31	.43	.42	.46*
Ratio of net investment income (%)	.02	1.05c	4.03	4.89*
a For the period from February 16, 2007 (commencement of operations) to April 30, 2007. b Total return would have been lower had certain expenses not been reduced. c Due to the timing of the subscriptions and redemptions, the amount shown does not correspond to the total return during the period. * Annualized ** Not annualized *** Amount is less than $.0005.

Notes to Financial Statements

1. Organization and Significant Accounting Policies

Cash Account Trust (the "Trust") is registered under the Investment Company Act of 1940, as amended (the "1940 Act"), as an open-end investment management company organized as a Massachusetts business trust.

The Trust offers three portfolios: Money Market Portfolio, Government & Agency Securities Portfolio and Tax-Exempt Portfolio. These financial statements report on Government & Agency Securities Portfolio (the "Portfolio").

Government & Agency Securities Portfolio offers seven classes of shares: Capital Assets Funds Shares, Davidson Cash Equivalent Shares, Davidson Cash Equivalent Plus Shares, DWS Government & Agency Money Fund, DWS Government Cash Institutional Shares, Government Cash Managed Shares and Service Shares. The Premier Money Market Shares class was liquidated on February 16, 2010 and is no longer offered.

The financial highlights for all classes of shares, other than DWS Government Cash Institutional Shares and Government Cash Managed Shares, are provided separately and are available upon request.

The Portfolio's investment income, realized and unrealized gains and losses, and certain Portfolio-level expenses and expense reductions, if any, are borne pro rata on the basis of relative net assets by the holders of all classes of shares of the Portfolio, except that each class bears certain expenses unique to that class such as distribution and service fees, services to shareholders and certain other class-specific expenses. Differences in class-level expenses may result in payment of different per share dividends by class. All shares of the Trust have equal rights with respect to voting subject to class-specific arrangements.

The Portfolio's financial statements are prepared in accordance with accounting principles generally accepted in the United States of America which require the use of management estimates. Actual results could differ from those estimates. The policies described below are followed consistently by the Portfolio in the preparation of its financial statements.

Security Valuation. Portfolio securities are valued utilizing the amortized cost method permitted in accordance with Rule 2a-7 under the 1940 Act and certain conditions therein. Under this method, which does not take into account unrealized gains or losses on securities, an instrument is initially valued at its cost and thereafter assumes a constant accretion/amortization rate to maturity of any discount or premium.

Repurchase Agreements. The Portfolio may enter into repurchase agreements with certain banks and broker/dealers whereby the Portfolio, through its custodian or sub-custodian bank, receives delivery of the underlying securities, the amount of which at the time of purchase and each subsequent business day is required to be maintained at such a level that the value is equal to at least the principal amount of the repurchase price plus accrued interest. The custodial bank holds the collateral in a separate account until the agreement matures. If the value of the securities falls below the principal amount of the repurchase agreement plus accrued interest, the financial institution deposits additional collateral by the following business day. If the financial institution either fails to deposit the required additional collateral or fails to repurchase the securities as agreed, the Portfolio has the right to sell the securities and recover any resulting loss from the financial institution. If the financial institution enters into bankruptcy, the Portfolio's claims on the collateral may be subject to legal proceedings.

Federal Income Taxes. The Portfolio's policy is to comply with the requirements of the Internal Revenue Code, as amended, which are applicable to regulated investment companies and to distribute all of its taxable and tax-exempt income to its shareholders.

The Portfolio has reviewed the tax positions for the open tax years as of April 30, 2010 and has determined that no provision for income tax is required in the Portfolio's financial statements. The Portfolio's federal tax returns for the prior three fiscal years remain open subject to examination by the Internal Revenue Service.

Distribution of Income. Net investment income of the Portfolio is declared as a daily dividend and is distributed to shareholders monthly. The Portfolio may take into account capital gains and losses in its daily dividend declarations. The Portfolio may also make additional distributions for tax purposes if necessary.

Permanent book and tax basis differences relating to shareholder distributions will result in reclassifications to paid in capital. Temporary book and tax basis differences will reverse in a subsequent period. There were no significant book-to-tax differences for the Portfolio.

At April 30, 2010, the Portfolio's components of distributable earnings on a tax-basis are as follows:

Undistributed ordinary income* $ 366,665

In addition, during the years ended April 30, 2010 and April 30, 2009, the tax character of distributions paid to shareholders by the Portfolio is summarized as follows:

	Years Ended April 30,
	2010	2009
Distributions from ordinary income*	$ 20,222,001	$ 104,415,283

* For tax purposes, short-term capital gains distributions are considered ordinary income distributions.

Expenses. Expenses of the Trust arising in connection with a specific Portfolio are allocated to that Portfolio. Other Trust expenses which cannot be directly attributed to a Portfolio are apportioned pro rata on the basis of relative net assets among the Portfolios in the Trust.

Contingencies. In the normal course of business, the Portfolio may enter into contracts with service providers that contain general indemnification clauses. The Portfolio's maximum exposure under these arrangements is unknown as this would involve future claims that may be made against the Portfolio that have not yet been made. However, based on experience, the Portfolio expects the risk of loss to be remote.

Other. Investment transactions are accounted for on trade date. Interest income is recorded on the accrual basis. Realized gains and losses from investment transactions are recorded on an identified cost basis. All premiums and discounts are amortized/accreted for both tax and financial reporting purposes.

2. Related Parties

Management Agreement. Under an Amended and Restated Investment Management Agreement with Deutsche Investment Management Americas Inc. ("DIMA" or the "Advisor"), an indirect, wholly owned subsidiary of Deutsche Bank AG, the Advisor directs the investments of the Portfolio in accordance with its investment objectives, policies and restrictions. The Advisor determines the securities, instruments and other contracts relating to investments to be purchased, sold or entered into by the Portfolio.

The Portfolio pays a monthly management fee based on the combined average daily net assets of the Portfolios and allocated to each Portfolio based on relative net assets, computed and accrued daily and payable monthly, at the following annual rates:

First $500 million of the Portfolios' combined average daily net assets	.120%
Next $500 million of such net assets	.100%
Next $1 billion of such net assets	.075%
Next $1 billion of such net assets	.060%
Over $3 billion of such net assets	.050%

The Advisor has agreed to contractually reduce its management fee for the Portfolio such that the annual effective rate is limited to 0.05% of the Portfolio's average daily net assets.

Accordingly, for the year ended April 30, 2010, the Advisor waived a portion of its management fee on the Portfolio aggregating $644,276 and the amount charged aggregated $7,795,967.

Accordingly, for the year ended April 30, 2010, the Portfolio incurred a management fee equivalent to the following annual effective rate of the Portfolio's average daily net assets:

	Annual Effective Rate
Government & Agency Securities Portfolio	.05%

For the period from May 1, 2009 through September 30, 2010, the Advisor has contractually agreed to waive its fees and/or reimburse certain operating expenses of the DWS Government Cash Institutional Shares and Government Cash Managed Shares to the extent necessary to maintain the operating expenses (excluding certain expenses such as extraordinary expenses, taxes, brokerage and interest) at 0.23% and 0.46%, respectively.

The Advisor also has agreed to maintain expenses of certain other classes of the Trust. These rates are disclosed in the respective share classes' annual reports that are provided separately and are available upon request.

In addition, the Advisor has agreed to voluntarily waive additional expenses. The waiver may be changed or terminated at any time without notice. Under these arrangements, the Advisor waived certain expenses on Government Cash Managed Shares.

Administration Fee. Pursuant to an Administrative Services Agreement, DIMA provides most administrative services to the Portfolio. For all services provided under the Administrative Services Agreement, the Portfolio pays the Advisor an annual fee ("Administration Fee") of 0.10% of the Portfolio's average daily net assets, computed and accrued daily and payable monthly. For the year ended April 30, 2010, the Administration Fee was as follows:

	Administration Fee	Unpaid at April 30, 2010
Government & Agency Securities Portfolio	$ 15,592,791	$ 788,546

Service Provider Fees. DWS Investments Service Company ("DISC"), an affiliate of the Advisor, is the transfer agent, dividend-paying agent and shareholder service agent for the Portfolio. Pursuant to a sub-transfer agency agreement between DISC and DST Systems, Inc. ("DST"), DISC has delegated certain transfer agent, dividend-paying agent and shareholder service agent functions to DST. DISC compensates DST out of the shareholder servicing fee it receives from the Portfolio. For the year ended April 30, 2010, the amounts charged to the Portfolio by DISC were as follows:

Government & Agency Securities Portfolio:	Total Aggregated	Waived	Unpaid at April 30, 2010
Capital Assets Funds Shares	$ 818,161	$ 437,675	$ 38,407
Davidson Cash Equivalent Shares	53,987	22,519	7,971
Davidson Cash Equivalent Plus Shares	66,157	32,574	12,125
DWS Government & Agency Money Fund	244,459	21,700	70,500
DWS Government Cash Institutional Shares	491,619	—	60,198
Government Cash Managed Shares	292,775	—	105,067
Premier Money Market Shares	3,790,616	518,152	—
Service Shares	330,455	161,658	27,994

Distribution Service Agreement. Under the Distribution Service Agreement, in accordance with Rule 12b-1 under the 1940 Act, DWS Investments Distributors, Inc. ("DIDI"), an affiliate of the Advisor, receives a fee ("Distribution Fee"), calculated as a percentage of average daily net assets for the shares listed in the following table.

For the year ended April 30, 2010, the Distribution Fee was as follows:

Government & Agency Securities Portfolio:	Distribution Fee	Waived	Unpaid at April 30, 2010	Annual Effective Rate	Contractual Rate (Up To)
Capital Assets Funds Shares	$ 1,002,349	$ 1,002,349	$ —	.00%	.33%
Davidson Cash Equivalent Shares	71,424	71,424	—	.00%	.30%
Davidson Cash Equivalent Plus Shares	75,389	75,389	—	.00%	.25%
Premier Money Market Shares	4,274,710	4,274,710	—	.00%	.25%
Service Shares	774,702	774,702	—	.00%	.60%

In addition, DIDI provides information and administrative services for a fee ("Service Fee") for the shares listed in the following table. A portion of these fees may be paid pursuant to a Rule 12b-1 plan.

For the year ended April 30, 2010, the Service Fee was as follows:

Government & Agency Securities Portfolio:	Service Fee	Waived	Unpaid at April 30, 2010	Annual Effective Rate	Contractual Rate (Up To)
Capital Assets Funds Shares	$ 759,439	$ 759,439	$ —	.00%	.25%
Davidson Cash Equivalent Shares	59,519	59,519	—	.00%	.25%
Davidson Cash Equivalent Plus Shares	60,311	60,311	—	.00%	.20%
Government Cash Managed Shares	501,277	369,502	3,103	.04%	.15%
Premier Money Market Shares	4,274,900	4,274,900	—	.00%	.25%

Typesetting and Filing Service Fees. Under an agreement with DIMA, DIMA is compensated for providing typesetting and certain regulatory filing services to the Portfolio. For the year ended April 30, 2010, the amount charged to the Portfolio by DIMA included in the Statement of Operations under "reports to shareholders" expenses was as follows:

	Total Aggregated	Unpaid at April 30, 2010
Government & Agency Securities Portfolio	$ 71,392	$ 24,807

Trustees' Fees and Expenses. The Portfolio paid each Trustee not affiliated with the Advisor retainer fees plus specified amounts for various committee services and for the Board Chairperson.

3. Fee Reductions

The Government & Agency Securities Portfolio has entered into an arrangement with its custodian whereby credits realized as a result of uninvested cash balances are used to reduce a portion of the Portfolio's custodian expenses. During the year ended April 30, 2010, the Portfolio's custodian fee was reduced as follows:

	Custody Credits
Government & Agency Securities Portfolio	$ 414

4. Line of Credit

The Portfolio and other affiliated funds (the "Participants") share in a $450 million revolving credit facility provided by a syndication of banks. The Portfolio may borrow for temporary or emergency purposes, including the meeting of redemption requests that otherwise might require the untimely disposition of securities. The Participants are charged an annual commitment fee which is allocated based on net assets, among each of the Participants. Interest is calculated at a rate per annum equal to the sum of the Federal Funds Rate plus 1.25 percent plus, if LIBOR exceeds the Federal Funds Rate, the amount of such excess. The Portfolio may borrow up to a maximum of 33 percent of its net assets under the agreement.

5. Share Transactions

The following table summarizes share and dollar activity in the Portfolio:

	Year Ended April 30, 2010		Year Ended April 30, 2009
	Shares	Dollars	Shares	Dollars
Shares sold
Capital Assets Funds Shares	649,627,293	$ 649,627,293	681,683,695	$ 681,683,695
Davidson Cash Equivalent Shares	14,397,365	14,397,365	17,323,178	17,323,178
Davidson Cash Equivalent Plus Shares	185,485,990	185,485,990	119,369,805	119,369,805
DWS Government & Agency Money Fund	105,758,351	105,758,351	225,363,477	225,363,477
DWS Government Cash Institutional Shares	86,737,251,385	86,737,251,385	52,360,583,911	52,360,583,911
Government Cash Managed Shares	1,141,762,346	1,141,762,346	1,094,974,655	1,094,974,655
Premier Money Market Shares	265,266,569	265,266,569	2,888,567,400	2,888,567,400
Service Shares	228,691,596	228,691,596	685,949,496	685,949,496
		$ 89,328,240,895		$ 58,073,815,617
Shares issued to shareholders in reinvestment of distributions
Capital Assets Funds Shares	65,880	$ 65,880	1,539,074	$ 1,539,074
Davidson Cash Equivalent Shares	5,141	5,141	260,593	260,593
Davidson Cash Equivalent Plus Shares	5,913	5,913	256,560	256,560
DWS Government & Agency Money Fund	195,740	195,740	5,481,030	5,481,030
DWS Government Cash Institutional Shares	8,526,918	8,526,918	37,575,969	37,575,969
Government Cash Managed Shares	8,301	8,301	452,853	452,853
Premier Money Market Shares	338,346	338,346	26,611,609	26,611,609
Service Shares	27,501	27,501	1,040,577	1,040,577
		$ 9,173,740		$ 73,218,265
Shares redeemed
Capital Assets Funds Shares	(625,330,611)	$ (625,330,611)	(602,594,057)	$ (602,594,057)
Davidson Cash Equivalent Shares	(23,739,455)	(23,739,455)	(28,211,841)	(28,211,841)
Davidson Cash Equivalent Plus Shares	(158,769,431)	(158,769,431)	(127,331,307)	(127,331,307)
DWS Government & Agency Money Fund	(198,527,517)	(198,527,517)	(344,085,420)	(344,085,420)
DWS Government Cash Institutional Shares	(94,492,111,010)	(94,492,111,010)	(38,908,807,396)	(38,908,807,396)
Government Cash Managed Shares	(1,338,740,329)	(1,338,740,329)	(997,447,690)	(997,447,690)
Premier Money Market Shares	(4,366,260,819)	(4,366,260,819)	(1,749,330,723)	(1,749,330,723)
Service Shares	(264,171,028)	(264,171,028)	(635,164,118)	(635,164,118)
		$ (101,467,650,200)		$ (43,392,972,552)
Net increase (decrease)
Capital Assets Funds Shares	24,362,562	$ 24,362,562	80,628,712	$ 80,628,712
Davidson Cash Equivalent Shares	(9,336,949)	(9,336,949)	(10,628,070)	(10,628,070)
Davidson Cash Equivalent Plus Shares	26,722,472	26,722,472	(7,704,942)	(7,704,942)
DWS Government & Agency Money Fund	(92,573,426)	(92,573,426)	(113,240,913)	(113,240,913)
DWS Government Cash Institutional Shares	(7,746,332,707)	(7,746,332,707)	13,489,352,484	13,489,352,484
Government Cash Managed Shares	(196,969,682)	(196,969,682)	97,979,818	97,979,818
Premier Money Market Shares	(4,100,655,904)	(4,100,655,904)	1,165,848,286	1,165,848,286
Service Shares	(35,451,931)	(35,451,931)	51,825,955	51,825,955
		$ (12,130,235,565)		$ 14,754,061,330

6. Participation in the Treasury's Temporary Guarantee Program

The Portfolio participated in the Temporary Guarantee Program for Money Market Funds (the "Program") established by the U.S. Department of the Treasury (the "Treasury"). The Program was terminated on September 18, 2009.

The Portfolio paid the expenses of participating in the Program. The expense was determined by the product of (i) the number of shares outstanding of each class as of September 19, 2008 valued at $1.00; and (ii) the applicable Program participation fee rate, which was based upon the market-based net asset value outstanding of each share class as of September 19, 2008. For the initial period ending December 18, 2008, the Program participation fee was equal to 0.010%. For the coverage under the Program beginning on December 19, 2008 and ending on April 30, 2009, the Program participation fee was equal to 0.015%. For the coverage under the Program beginning on May 1, 2009 and ending September 18, 2009, the Program participation fee was equal to 0.015%. This expense was amortized over the length of the participation in the Program and is included in "Temporary guarantee program participation fee" on the Statement of Operations. For the period from May 1, 2009 through September 18, 2009, the Portfolio accrued $1,862,809. This expense was borne by the portfolio without regard to any expense limitation currently in effect for the Portfolio.

Neither the Portfolio nor Deutsche Investment Management Americas Inc., the Portfolio's investment advisor, are in any manner approved, endorsed, sponsored or authorized by the Treasury.

7. Review for Subsequent Events

Management has evaluated the events and transactions subsequent to year end through the date the financial statements were available to be issued, and has determined that there were no material events that would require disclosure in the Portfolio's financial statements.

Report of Independent Registered Public Accounting Firm

To the Shareholders and Board of Trustees of Cash Account Trust:

We have audited the accompanying statement of assets and liabilities of the Government & Agency Securities Portfolio (the "Portfolio"), one of the portfolios constituting Cash Account Trust (the "Trust"), including the investment portfolio, as of April 30, 2010, and the related statement of operations for the year then ended, the statement of changes in net assets for each of the two years in the period then ended, and the financial highlights for each of the periods indicated therein. These financial statements and financial highlights are the responsibility of the Trust's management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. We were not engaged to perform an audit of the Trust's internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Trust's internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements and financial highlights, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our procedures included confirmation of securities owned as of April 30, 2010, by correspondence with the custodian and brokers or by other appropriate auditing procedures where replies from brokers were not received. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of the Government & Agency Securities Portfolio of Cash Account Trust at April 30, 2010, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended, and the financial highlights for each of the periods indicated therein, in conformity with U.S. generally accepted accounting principles.

Boston, Massachusetts
June 24, 2010

Tax Information (Unaudited)

A total of 40% of the dividends distributed during the fiscal year was derived from interest on US government securities, which is generally exempt from state income tax.

Please consult a tax advisor if you have questions about federal or state income tax laws, or on how to prepare your tax returns. If you have specific questions about your account, please call (800) 621-1048.

Summary of Management Fee Evaluation by Independent Fee Consultant

October 9, 2009, As Revised November 20, 2009

Pursuant to an Order entered into by Deutsche Investment Management Americas and affiliates (collectively, "DeAM") with the Attorney General of New York, I, Thomas H. Mack, have been appointed the Independent Fee Consultant for the DWS Funds (formerly the DWS Scudder Funds). My duties include preparing an annual written evaluation of the management fees DeAM charges the Funds, considering among other factors the management fees charged by other mutual fund companies for like services, management fees DeAM charges other clients for like services, DeAM's costs of supplying services under the management agreements and related profit margins, possible economies of scale if a Fund grows larger, and the nature and quality of DeAM's services, including fund performance. This report summarizes my evaluation for 2009, including my qualifications, the evaluation process for each of the DWS Funds, consideration of certain complex-level factors, and my conclusions. I served in substantially the same capacity in 2007 and 2008.

Qualifications

For more than 35 years I have served in various professional capacities within the investment management business. I have held investment analysis and advisory positions, including securities analyst, portfolio strategist and director of investment policy with a large investment firm. I have also performed business management functions, including business development, financial management and marketing research and analysis.

Since 1991, I have been an independent consultant within the asset management industry. I have provided services to over 125 client organizations, including investment managers, mutual fund boards, product distributors and related organizations. Over the past ten years I have completed a number of assignments for mutual fund boards, specifically including assisting boards with management contract renewal.

I hold a Master of Business Administration degree, with highest honors, from Harvard University and Master of Science and Bachelor of Science (highest honors) degrees from the University of California at Berkeley. I am an independent director and audit committee financial expert for two closed-end mutual funds and serve in various leadership and financial oversight capacities with non-profit organizations.

Evaluation of Fees for each DWS Fund

My work focused primarily on evaluating, fund-by-fund, the fees charged to each of the 124 publicly offered Fund portfolios in the DWS Fund family. For each Fund, I considered each of the key factors mentioned above, as well as any other relevant information. In doing so I worked closely with the Funds' Independent Directors in their annual contract renewal process, as well as in their approval of contracts for several new funds (documented separately).

In evaluating each Fund's fees, I reviewed comprehensive materials provided by or on behalf of DeAM, including expense information prepared by Lipper Analytical, comparative performance information, profitability data, manager histories, and other materials. I also accessed certain additional information from the Lipper, Strategic Insight, and Morningstar databases and drew on my industry knowledge and experience.

To facilitate evaluating this considerable body of information, I prepared for each Fund a document summarizing the key data elements in each area as well as additional analytics discussed below. This made it possible to consider each key data element in the context of the others.

In the course of contract renewal, DeAM agreed to implement a number of fee and expense adjustments requested by the Independent Directors which will favorably impact future fees and expenses, and my evaluation includes the effects of these changes.

Fees and Expenses Compared with Other Funds

The competitive fee and expense evaluation for each fund focused on two primary comparisons:

The Fund's contractual management fee (the advisory fee plus the administration fee where applicable) compared with those of a group of typically 12-15 funds in the same Lipper investment category (e.g. Large Capitalization Growth) having similar distribution arrangements and being of similar size.

The Fund's total expenses compared with a broader universe of funds from the same Lipper investment category and having similar distribution arrangements.

These two comparisons provide a view of not only the level of the fee compared with funds of similar scale but also the total expense the Fund bears for all the services it receives, in comparison with the investment choices available in the Fund's investment category and distribution channel. The principal figure-of-merit used in these comparisons was the subject Fund's percentile ranking against peers.

DeAM's Fees for Similar Services to Others

DeAM provided management fee schedules for all of its US domiciled fund and non-fund investment management accounts in any of the investment categories where there is a DWS Fund. These similar products included the other DWS Funds, non-fund pooled accounts, institutional accounts and sub-advisory accounts. Using this information, I calculated for each Fund the fee that would be charged to each similar product, at the subject Fund's asset level.

Evaluating information regarding non-fund products is difficult because there are varying levels of services required for different types of accounts, with mutual funds generally requiring considerably more regulatory and administrative types of service as well as having more frequent cash flows than other types of accounts. Also, while mutual fund fees for similar fund products can be expected to be similar, there will be some differences due to different pricing conditions in different distribution channels (e.g. retail funds versus those used in variable insurance products), differences in underlying investment processes and other factors.

Costs and Profit Margins

DeAM provided a detailed profitability analysis for each Fund. After making some adjustments so that the presentation would be more comparable to the available industry figures, I reviewed profit margins from investment management alone, from investment management plus other fund services (excluding distribution) provided to the Funds by DeAM (principally shareholder services), and DeAM profits from all sources, including distribution. A later section comments on overall profitability.

Economies of Scale

Economies of scale — an expected decline in management cost per dollar of fund assets as fund assets grow — are very rarely quantified and documented because of inherent difficulties in collecting and analyzing relevant data. However, in virtually every investment category that I reviewed, larger funds tend to have lower fees and lower total expenses than smaller funds. To see how each DWS Fund compares with this industry observation, I reviewed:

The trend in Fund assets over the last five years and the accompanying trend in total expenses. This shows if the Fund has grown and, if so, whether total expense (management fees as well as other expenses) have declined as a percent of assets.

Whether the Fund has break-points in its management fee schedule, the extent of the fee reduction built into the schedule and the asset levels where the breaks take effect, and in the case of a sub-advised Fund how the Fund's break-points compare with those of the sub-advisory fee schedule.

How the Fund's contractual fee schedule compares with trends in the industry data. To accomplish this, I constructed a chart showing how actual latest-fiscal-year contractual fees of the Fund and of other similar funds relate to average fund assets, with the subject Fund's contractual fee schedule superimposed.

Quality of Service — Performance

The quality-of-service evaluation focused on investment performance, which is the principal result of the investment management service. Each Fund's performance was reviewed over the past 1, 3, 5 and 10 years, as applicable, and compared with that of other funds in the same investment category and with a suitable market index.

In addition, I calculated and reviewed risk-adjusted returns relative to an index of similar mutual funds' returns and a suitable market index. The risk-adjusted returns analysis provides a way of determining the extent to which the Fund's return comparisons are mainly the product of investment value-added (or lack thereof) or alternatively taking considerably more or less risk than is typical in its investment category.

I also received and considered the history of portfolio manager changes for each Fund, as this provided an important context for evaluating the performance results.

Complex-Level Considerations

While this evaluation was conducted mainly at the individual fund level, there are some issues relating to the reasonableness of fees that can alternatively be considered across the whole fund complex:

I reviewed DeAM's profitability analysis for all DWS Funds, with a view toward determining if the allocation procedures used were reasonable and how profit levels compared with public data for other investment managers.

I considered whether DeAM and affiliates receive any significant ancillary or "fall-out" benefits that should be considered in interpreting the direct profitability results. These would be situations where serving as the investment manager of the Funds is beneficial to another part of the Deutsche Bank organization.

I considered how aggregated DWS Fund expenses had varied over the years, by asset class and in the context of trends in asset levels.

I reviewed the structure of the DeAM organization, trends in staffing levels, and information on compensation of investment management and other professionals compared with industry data.

Findings

Based on the process and analysis discussed above, which included reviewing a wide range of information from management and external data sources and considering among other factors the fees DeAM charges other clients, the fees charged by other fund managers, DeAM's costs and profits associated with managing the Funds, economies of scale, possible fall-out benefits, and the nature and quality of services provided, in my opinion the management fees charged the DWS Funds are reasonable.

Thomas H. Mack

Board Members and Officers

The following table presents certain information regarding the Board Members and Officers of the Trust as of April 30, 2010. Each Board Member's year of birth is set forth in parentheses after his or her name. Unless otherwise noted, (i) each Board Member has engaged in the principal occupation(s) noted in the table for at least the most recent five years, although not necessarily in the same capacity; and (ii) the address of each Independent Board Member is c/o Paul K. Freeman, Independent Chairman, DWS Funds, PO Box 101833, Denver, CO 80250-1833. Except as otherwise noted below, the term of office for each Board Member is until the election and qualification of a successor, or until such Board Member sooner dies, resigns, is removed or as otherwise provided in the governing documents of the fund. Because the fund does not hold an annual meeting of shareholders, each Board Member will hold office for an indeterminate period. The Board Members may also serve in similar capacities with other funds in the fund complex. The Length of Time Served represents the year in which the Board Member joined the board of one or more DWS funds now overseen by the Board.

Independent Board Members
Name, Year of Birth, Position with the Fund and Length of Time Served1	Business Experience and Directorships During the Past Five Years	Number of Funds in DWS Fund Complex Overseen
Paul K. Freeman (1950) Chairperson since 2009 Board Member since 1993	Consultant, World Bank/Inter-American Development Bank; Governing Council of the Independent Directors Council (governance, education committees); formerly, Project Leader, International Institute for Applied Systems Analysis (1998-2001); Chief Executive Officer, The Eric Group, Inc. (environmental insurance) (1986-1998)	126
John W. Ballantine (1946) Board Member since 1999	Retired; formerly, Executive Vice President and Chief Risk Management Officer, First Chicago NBD Corporation/The First National Bank of Chicago (1996-1998); Executive Vice President and Head of International Banking (1995-1996). Directorships: Healthways, Inc. (provider of disease and care management services); Portland General Electric (utility company); Stockwell Capital Investments PLC (private equity). Former Directorships: First Oak Brook Bancshares, Inc. and Oak Brook Bank; Prisma Energy International	126
Henry P. Becton, Jr. (1943) Board Member since 1990	Vice Chair and former President, WGBH Educational Foundation. Directorships: Association of Public Television Stations; Lead Director, Becton Dickinson and Company3 (medical technology company); Lead Director, Belo Corporation3 (media company); Public Radio International; Public Radio Exchange (PRX); The PBS Foundation. Former Directorships: Boston Museum of Science; American Public Television; Concord Academy; New England Aquarium; Mass. Corporation for Educational Telecommunications; Committee for Economic Development; Public Broadcasting Service	126
Dawn-Marie Driscoll (1946) Board Member since 1987	President, Driscoll Associates (consulting firm); Executive Fellow, Center for Business Ethics, Bentley University; formerly, Partner, Palmer & Dodge (1988-1990); Vice President of Corporate Affairs and General Counsel, Filene's (1978-1988). Directorships: Trustee of 20 open-end mutual funds managed by Sun Capital Advisers, Inc. (since 2007); Director of ICI Mutual Insurance Company (since 2007); Advisory Board, Center for Business Ethics, Bentley University; Trustee, Southwest Florida Community Foundation (charitable organization). Former Directorships: Investment Company Institute (audit, executive, nominating committees) and Independent Directors Council (governance, executive committees)	126
Keith R. Fox (1954) Board Member since 1996	Managing General Partner, Exeter Capital Partners (a series of private investment funds). Directorships: Progressive Holding Corporation (kitchen goods importer and distributor); Box Top Media Inc. (advertising); The Kennel Shop (retailer); former Chairman, National Association of Small Business Investment Companies	126
Kenneth C. Froewiss (1945) Board Member since 2001	Adjunct Professor of Finance, NYU Stern School of Business (September 2009-present; Clinical Professor from 1997-September 2009); Member, Finance Committee, Association for Asian Studies (2002-present); Director, Mitsui Sumitomo Insurance Group (US) (2004-present); prior thereto, Managing Director, J.P. Morgan (investment banking firm) (until 1996)	126
Richard J. Herring (1946) Board Member since 1990	Jacob Safra Professor of International Banking and Professor, Finance Department, The Wharton School, University of Pennsylvania (since July 1972); Co-Director, Wharton Financial Institutions Center (since July 2000); Director, Japan Equity Fund, Inc. (since September 2007), Thai Capital Fund, Inc. (since September 2007), Singapore Fund, Inc. (since September 2007). Formerly, Vice Dean and Director, Wharton Undergraduate Division (July 1995-June 2000); Director, Lauder Institute of International Management Studies (July 2000-June 2006)	126
William McClayton (1944) Board Member since 2004	Private equity investor (since October 2009); previously, Managing Director, Diamond Management & Technology Consultants, Inc. (global consulting firm) (2001-2009); Directorship: Board of Managers, YMCA of Metropolitan Chicago; formerly: Senior Partner, Arthur Andersen LLP (accounting) (1966-2001); Trustee, Ravinia Festival	126
Rebecca W. Rimel (1951) Board Member since 1995	President and Chief Executive Officer, The Pew Charitable Trusts (charitable organization) (1994 to present); Trustee, Thomas Jefferson Foundation (charitable organization) (1994 to present); Trustee, Executive Committee, Philadelphia Chamber of Commerce (2001-2007); Trustee, Pro Publica (2007-present) (charitable organization); Director, CardioNet, Inc.2 (2009-present) (health care). Formerly, Executive Vice President, The Glenmede Trust Company (investment trust and wealth management) (1983-2004); Board Member, Investor Education (charitable organization) (2004-2005); Director, Viasys Health Care2 (January 2007-June 2007)	126
William N. Searcy, Jr. (1946) Board Member since 1993	Private investor since October 2003; Trustee of 20 open-end mutual funds managed by Sun Capital Advisers, Inc. (since October 1998). Formerly, Pension & Savings Trust Officer, Sprint Corporation2 (telecommunications) (November 1989-September 2003)	126
Jean Gleason Stromberg (1943) Board Member since 1997	Retired. Formerly, Consultant (1997-2001); Director, Financial Markets US Government Accountability Office (1996-1997); Partner, Fulbright & Jaworski, L.L.P. (law firm) (1978-1996). Directorships: The William and Flora Hewlett Foundation; Business Leadership Council, Wellesley College. Former Directorships: Service Source, Inc., Mutual Fund Directors Forum (2002-2004), American Bar Retirement Association (funding vehicle for retirement plans) (1987-1990 and 1994-1996)	126
Robert H. Wadsworth (1940) Board Member since 1999	President, Robert H. Wadsworth & Associates, Inc. (consulting firm) (1983 to present); Director, The Phoenix Boys Choir Association	129

Interested Board Member and Officer4
Name, Year of Birth, Position with the Trust/ Corporation and Length of Time Served1,5	Business Experience and Directorships During the Past Five Years	Number of Funds in DWS Fund Complex Overseen
Ingo Gefeke7 (1967) Board Member since 2010 Executive Vice President since 2010	Managing Director3, Deutsche Asset Management; Global Head of Distribution and Product Management, DWS Global Head of Trading and Securities Lending. Member of the Board of Directors of DWS Investment GmbH Frankfurt (since July 2009) and DWS Holding & Service GmbH Frankfurt (since January 2010); formerly, Global Chief Administrative Officer, Deutsche Asset Management (2004-2009); Global Chief Operating Officer, Global Transaction Banking, Deutsche Bank AG, New York (2001-2004); Chief Operating Officer, Global Banking Division Americas, Deutsche Bank AG, New York (1999-2001); Central Management, Global Banking Services, Deutsche Bank AG, Frankfurt (1998-1999); Relationship Management, Deutsche Bank AG, Tokyo, Japan (1997-1998)	58

Officers4
Name, Year of Birth, Position with the Fund and Length of Time Served5	Principal Occupation(s) During Past 5 Years and Other Directorships Held
Michael G. Clark6 (1965) President, 2006-present	Managing Director3, Deutsche Asset Management (2006-present); President of DWS family of funds; Director, ICI Mutual Insurance Company (since October 2007); formerly, Director of Fund Board Relations (2004-2006) and Director of Product Development (2000-2004), Merrill Lynch Investment Managers; Senior Vice President Operations, Merrill Lynch Asset Management (1999-2000)
John Millette8 (1962) Vice President and Secretary, 1999-present	Director3, Deutsche Asset Management
Paul H. Schubert6 (1963) Chief Financial Officer, 2004-present Treasurer, 2005-present	Managing Director3, Deutsche Asset Management (since July 2004); formerly, Executive Director, Head of Mutual Fund Services and Treasurer for UBS Family of Funds (1998-2004); Vice President and Director of Mutual Fund Finance at UBS Global Asset Management (1994-1998)
Caroline Pearson8,11 (1962) Chief Legal Officer since April 2010	Managing Director3, Deutsche Asset Management; formerly, Assistant Secretary for DWS family of funds (1997-2010)
Rita Rubin9 (1970) Assistant Secretary, 2009-present	Vice President and Counsel, Deutsche Asset Management (since October 2007); formerly, Vice President, Morgan Stanley Investment Management (2004-2007); Attorney, Shearman & Sterling LLP (2004); Director and Associate General Counsel, UBS Global Asset Management (US) Inc. (2001-2004)
Paul Antosca8 (1957) Assistant Treasurer, 2007-present	Director3, Deutsche Asset Management (since 2006); Vice President, The Manufacturers Life Insurance Company (U.S.A.) (1990-2006)
Jack Clark8 (1967) Assistant Treasurer, 2007-present	Director3, Deutsche Asset Management (since 2007); formerly, Vice President, State Street Corporation (2002-2007)
Diane Kenneally8 (1966) Assistant Treasurer, 2007-present	Director3, Deutsche Asset Management
John Caruso10 (1965) Anti-Money Laundering Compliance Officer, 2010-present	Managing Director3, Deutsche Asset Management
Robert Kloby9 (1962) Chief Compliance Officer, 2006-present	Managing Director3, Deutsche Asset Management

¹ The length of time served represents the year in which the Board Member joined the board of one or more DWS funds currently overseen by the Board.

² A publicly held company with securities registered pursuant to Section 12 of the Securities Exchange Act of 1934.

³ Executive title, not a board directorship.

⁴ As a result of their respective positions held with the Advisor, these individuals are considered "interested persons" of the Advisor within the meaning of the 1940 Act. Interested persons receive no compensation from the fund.

⁵ The length of time served represents the year in which the officer was first elected in such capacity for one or more DWS funds.

⁶ Address: 345 Park Avenue, New York, New York 10154.

⁷ The mailing address of Mr. Gefeke is 345 Park Avenue, New York, New York 10154. In addition, Mr. Gefeke is an interested Board Member of certain DWS funds by virtue of his positions with Deutsche Asset Management. As an interested person, Mr. Gefeke receives no compensation from the fund.

⁸ Address: One Beacon Street, Boston, MA 02108.

⁹ Address: 280 Park Avenue, New York, New York 10017.

¹⁰ Address: 60 Wall Street, New York, New York 10005.

¹¹ Effective April 23, 2010, J. Christopher Jackson resigned as Chief Legal Officer, and Caroline Pearson was appointed as Chief Legal Officer.

The fund's Statement of Additional Information ("SAI") includes additional information about the Board Members. The SAI is available, without charge, upon request. If you would like to request a copy of the SAI, you may do so by calling the following toll-free number: (800) 621-1048.

Notes

Notes

Notes

Notes

Notes

Notes

ITEM 2.	CODE OF ETHICS
	As of the end of the period, April 30, 2010, Government & Agency Securities Portfolio (DWS Government Cash Institutional Shares, Government Cash Managed Shares) has a code of ethics, as defined in Item 2 of Form N-CSR, that applies to its Principal Executive Officer and Principal Financial Officer. There have been no amendments to, or waivers from, a provision of the code of ethics during the period covered by this report that would require disclosure under Item 2. A copy of the code of ethics is filed as an exhibit to this Form N-CSR.
ITEM 3.	AUDIT COMMITTEE FINANCIAL EXPERT
	The fund’s audit committee is comprised solely of trustees who are "independent" (as such term has been defined by the Securities and Exchange Commission ("SEC") in regulations implementing Section 407 of the Sarbanes-Oxley Act (the "Regulations")). The fund’s Board of Trustees has determined that there are several "audit committee financial experts" (as such term has been defined by the Regulations) serving on the fund’s audit committee including Mr. William McClayton, the chair of the fund’s audit committee. An “audit committee financial expert” is not an “expert” for any purpose, including for purposes of Section 11 of the Securities Act of 1933 and the designation or identification of a person as an “audit committee financial expert” does not impose on such person any duties, obligations or liability that are greater than the duties, obligations and liability imposed on such person as a member of the audit committee and board of directors in the absence of such designation or identification.
ITEM 4.	PRINCIPAL ACCOUNTANT FEES AND SERVICES

CASH ACCOUNT TRUST- GOVERNMENT & AGENCY SECURITIES PORTFOLIO

FORM N-CSR DISCLOSURE RE: AUDIT FEES

The following table shows the amount of fees that Ernst & Young LLP (“E&Y”), the Fund’s Independent Registered Public Accountant, billed to the Fund during the Fund’s last two fiscal years. The Audit Committee approved in advance all audit services and non-audit services that E&Y provided to the Fund.

Services that the Fund’s Independent Registered Public Accountant Billed to the Fund

Fiscal Year Ended April 30,	Audit Fees Billed to Fund	Audit-Related Fees Billed to Fund	Tax Fees Billed to Fund	All Other Fees Billed to Fund
2010	$90,290	$0	$11,334	$0
2009	$92,747	$0	$6,981	$0

The above "Tax Fees" were billed for professional services rendered for tax return preparation.

Services that the Fund’s Independent Registered Public Accountant Billed to the Adviser and Affiliated Fund Service Providers

The following table shows the amount of fees billed by E&Y to Deutsche Investment Management Americas, Inc. (“DIMA” or the “Adviser”), and any entity controlling, controlled by or under common control with DIMA (“Control Affiliate”) that provides ongoing services to the Fund (“Affiliated Fund Service Provider”), for engagements directly related to the Fund’s operations and financial reporting, during the Fund’s last two fiscal years.

Fiscal Year Ended April 30,	Audit-Related Fees Billed to Adviser and Affiliated Fund Service Providers	Tax Fees Billed to Adviser and Affiliated Fund Service Providers	All Other Fees Billed to Adviser and Affiliated Fund Service Providers
2010	$0	$315,930	$0
2009	$0	$524,500	$0

The above “Tax Fees” were billed in connection with tax compliance services and agreed upon procedures.

Non-Audit Services

The following table shows the amount of fees that E&Y billed during the Fund’s last two fiscal years for non-audit services. The Audit Committee pre-approved all non-audit services that E&Y provided to the Adviser and any Affiliated Fund Service Provider that related directly to the Fund’s operations and financial reporting. The Audit Committee requested and received information from E&Y about any non-audit services that E&Y rendered during the Fund’s last fiscal year to the Adviser and any Affiliated Fund Service Provider. The Committee considered this information in evaluating E&Y’s independence.

Fiscal Year Ended April 30,	Total Non-Audit Fees Billed to Fund (A)	Total Non-Audit Fees billed to Adviser and Affiliated Fund Service Providers (engagements related directly to the operations and financial reporting of the Fund) (B)	Total Non-Audit Fees billed to Adviser and Affiliated Fund Service Providers (all other engagements) (C)	Total of (A), (B) and (C)
2010	$11,334	$315,930	$625,859	$953,123
2009	$6,981	$524,500	$1,248,247	$1,779,728

All other engagement fees were billed for services in connection with internal control reviews, agreed upon procedures and tax compliance for DIMA and other related entities that provide support for the operations of the Fund.

Audit Committee Pre-Approval Policies and Procedures. Generally, each Fund’s Audit Committee must pre approve (i) all services to be performed for a Fund by a Fund’s Independent Registered Public Accounting Firm and (ii) all non-audit services to be performed by a Fund’s Independent Registered Public Accounting Firm for the DIMA Entities with respect to operations and financial reporting of the Fund, except that the Chairperson or Vice Chairperson of each Fund’s Audit Committee may grant the pre-approval for non-audit services described in items (i) and (ii) above for non-prohibited services for engagements of less than $100,000. All such delegated pre approvals shall be presented to each Fund’s Audit Committee no later than the next Audit Committee meeting.

There were no amounts that were approved by the Audit Committee pursuant to the de minimis exception under Rule 2-01 of Regulation S-X.

According to the registrant’s principal Independent Registered Public Accounting Firm, all of the principal Independent Registered Public Accounting Firm's hours spent on auditing the registrant's financial statements were attributed to work performed by full-time permanent employees of the principal Independent Registered Public Accounting Firm.

***

In connection with the audit of the 2009 and 2010 financial statements, the Fund entered into an engagement letter with E&Y. The terms of the engagement letter required by E&Y, and agreed to by the Audit Committee, include provisions in which the parties consent to the sole jurisdiction of federal courts in New York, Boston or the Northern District of Illinois, as well as a waiver of right to a trial by jury and an exclusion of punitive damages.

***

E&Y advised the Fund’s Audit Committee that E&Y had identified three matters that it determined to be inconsistent with the SEC’s auditor independence rules.

First, E&Y advised the Fund’s Audit Committee that, in 2007 and 2008, Deutsche Bank AG (“DB”) provided standard overdraft protection on a depository account to the E&Y member firm in India (“E&Y India”). DB is within the “Investment Company Complex” (as defined by SEC rules) and therefore covered by the SEC auditor independence rules applicable to the Fund. E&Y advised the Audit Committee that E&Y India utilized this arrangement twice in 2007; therefore, the arrangement constituted a lending type arrangement in violation of Rule 2-01(c)(1)(ii)(A) of Regulation S-X as described above. E&Y advised the Audit Committee that E&Y believes its independence has not been impacted as it relates to the audit of the Fund. In reaching this conclusion, E&Y noted a number of factors,including that the arrangement did not create a mutual or conflicting interest between E&Y and the Fund and that the arrangement did not involve the Fund, but rather affiliates of the Fund in the Investment Company Complex. E&Y informed the Audit Committee that E&Y India has cancelled the overdraft arrangement.

Second, E&Y advised the Fund’s Audit Committee that, in 2008, an E&Y professional purchased interests in a fund sponsored by a subsidiary of Deutsche Bank AG that is not audited by E&Y. Subsequent to the purchase, the E&Y professional became a Covered Person (as defined by SEC rules) of the Fund as a result of providing non-audit services to a DB entity within the Investment Company Complex. E&Y informed the Audit Committee that this investment constituted an investment in an affiliate of an audit client in violation of the Rule 2-01(c)(1) of Regulation S-X. E&Y advised the Audit Committee that E&Y believes its independence has not been impacted as it relates to the audit of the Fund. In reaching this conclusion, E&Y noted a number of factors, including thatthe E&Y professional did not have any financial interest in the Fund and was not involved with the provision of audit services to the Fund. E&Y informed the Audit Committee that the E&Y professional no longer provides any services to any entity within the Investment Company Complex and is no longer deemed to be a Covered Person with respect to the Fund.

Finally, E&Y advised the Fund’s Audit Committee that, in 2008, an E&Y professional whose spouse owned interests in two DWS Funds that are not audited by E&Y, became a Covered Person of the Fund as a result of providing attest services to a DB entity within the Investment Company Complex. E&Y informed the Audit Committee that this investment constituted an investment in an affiliate of an audit client in violation of the Rule 2-01(c)(1) of Regulation S-X. E&Y advised the Audit Committee that E&Y believes its independence has not been impacted as it relates to the audit of the Fund. In reaching this conclusion, E&Y noted a number of factors, including thatthe E&Y professional did not have any financial interest in the Fund and was not involved with the provision of audit services to the Fund. E&Y informed the Audit Committee that the E&Y professional no longer provides any services to any entity within the Investment Company Complex and is no longer deemed to be a Covered Person with respect to the Fund.

ITEM 5.	AUDIT COMMITTEE OF LISTED REGISTRANTS
	Not Applicable
ITEM 6.	SCHEDULE OF INVESTMENTS
	Not Applicable
ITEM 7.	DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES
	Not applicable.
ITEM 8.	PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES
	Not applicable.
ITEM 9.	PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT COMPANY AND AFFILIATED PURCHASERS
	Not Applicable.
ITEM 10.	SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
	There were no material changes to the procedures by which shareholders may recommend nominees to the Fund’s Board. The primary function of the Nominating and Governance Committee is to identify and recommend individuals for membership on the Board and oversee the administration of the Board Governance Guidelines. Shareholders may recommend candidates for Board positions by forwarding their correspondence by U.S. mail or courier service to Paul K. Freeman, Independent Chairman, DWS Funds, P.O. Box 101833, Denver, CO 80250-1833.
ITEM 11.	CONTROLS AND PROCEDURES
	(a)          The Chief Executive and Financial Officers concluded that the Registrant’s Disclosure Controls and Procedures are effective based on the evaluation of the Disclosure Controls and Procedures as of a date within 90 days of the filing date of this report.
	(b)         There have been no changes in the registrant’s internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant’s internal controls over financial reporting.
ITEM 12.	EXHIBITS
	(a)(1)     Code of Ethics pursuant to Item 2 of Form N-CSR is filed and attached hereto as EX-99.CODE ETH.
	(a)(2)     Certification pursuant to Rule 30a-2(a) under the Investment Company Act of 1940 (17 CFR 270.30a-2(a)) is filed and attached hereto as Exhibit 99.CERT.
	(b)         Certification pursuant to Rule 30a-2(b) under the Investment Company Act of 1940 (17 CFR 270.30a-2(b)) is furnished and attached hereto as Exhibit 99.906CERT.

Form N-CSR Item F

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Registrant:	Government & Agency Securities Portfolio (DWS Government Cash Institutional Shares, Government Cash Managed Shares), a series of Cash Account Trust
By:	/s/Michael G. Clark Michael G. Clark President
Date:	June 29, 2010

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

Registrant:	Government & Agency Securities Portfolio (DWS Government Cash Institutional Shares, Government Cash Managed Shares), a series of Cash Account Trust
By:	/s/Michael G. Clark Michael G. Clark President
Date:	June 29, 2010
By:	/s/Paul Schubert Paul Schubert Chief Financial Officer and Treasurer
Date:	June 29, 2010

EX-99.CODE ETH

DWS Investments

Principal Executive and Principal Financial Officer Code of Ethics

For the Registered Management Investment Companies Listed on Appendix A

Effective Date

[January 31, 2005]

Table of Contents

I. Overview 3

II. Purposes of the Officer Code 3

III. Responsibilities of Covered Officers 4

A. Honest and Ethical Conduct 4

B. Conflicts of Interest 4

C. Use of Personal Fund Shareholder Information 6

D. Public Communications 6

E. Compliance with Applicable Laws, Rules and Regulations 6

IV. Violation Reporting 7

A. Overview 7

B. How to Report 7

C. Process for Violation Reporting to the Fund Board 7

D. Sanctions for Code Violations 7

V. Waivers from the Officer Code 8

VI. Amendments to the Code 8

VII. Acknowledgement and Certification of Adherence to the Officer Code 8

IX. Recordkeeping 9

X. Confidentiality 9

Appendices 10

Appendix A: List of Officers Covered under the Code, by Board 10

Appendix B: Officer Code Acknowledgement and Certification Form 11

Appendix C: Definitions 13

I.

Overview

This Principal Executive Officer and Principal Financial Officer Code of Ethics (“Officer Code”) sets forth the policies, practices, and values expected to be exhibited in the conduct of the Principal Executive Officers and Principal Financial Officers of the investment companies (“Funds”) they serve (“Covered Officers”). A list of Covered Officers and Funds is included on Appendix A.

The Boards of the Funds listed on Appendix A have elected to implement the Officer Code, pursuant to Section 406 of the Sarbanes-Oxley Act of 2002 and the SEC’s rules thereunder, to promote and demonstrate honest and ethical conduct in their Covered Officers.

Deutsche Asset Management, Inc. or its affiliates (“DeAM”) serves as the investment adviser to each Fund. All Covered Officers are also employees of DeAM or an affiliate. Thus, in addition to adhering to the Officer Code, these individuals must comply with DeAM policies and procedures, such as the DeAM Code of Ethics governing personal trading activities, as adopted pursuant to Rule 17j-1 under the Investment Company Act of 1940.¹ In addition, such individuals also must comply with other applicable Fund policies and procedures.

The DeAM Compliance Officer, who shall not be a Covered Officer and who shall serve as such subject to the approval of the Fund’s Board (or committee thereof), is primarily responsible for implementing and enforcing this Code. The Compliance Officer has the authority to interpret this Officer Code and its applicability to particular circumstances. Any questions about the Officer Code should be directed to the DeAM Compliance Officer.

The DeAM Compliance Officer and his or her contact information can be found in Appendix A.

 

II. Purposes of the Officer Code

The purposes of the Officer Code are to deter wrongdoing and to:

• promote honest and ethical conduct among Covered Officers, including the ethical handling of actual or apparent conflicts of interest between personal and professional relationships;

• promote full, fair, accurate, timely and understandable disclosures in reports and documents that the Funds file with or submit to the SEC (and in other public communications from the Funds) and that are within the Covered Officer’s responsibilities;

• promote compliance with applicable laws, rules and regulations;

• encourage the prompt internal reporting of violations of the Officer Code to the DeAM Compliance Officer; and

• establish accountability for adherence to the Officer Code.

_________________________

¹ The obligations imposed by the Officer Code are separate from, and in addition to, any obligations imposed under codes of ethics adopted pursuant to Rule 17j-1 under the Investment Company Act of 1940, and any other code of conduct applicable to Covered Officers in whatever capacity they serve. The Officer Code does not incorporate any of those other codes and, accordingly, violations of those codes will not necessarily be considered violations of the Officer Code and waivers granted under those codes would not necessarily require a waiver to be granted under this Code. Sanctions imposed under those codes may be considered in determining appropriate sanctions for any violation of this Code.

Any questions about the Officer Code should be referred to DeAM’s Compliance Officer.

 

III. Responsibilities of Covered Officers

 

A. Honest and Ethical Conduct

It is the duty of every Covered Officer to encourage and demonstrate honest and ethical conduct, as well as adhere to and require adherence to the Officer Code and any other applicable policies and procedures designed to promote this behavior. Covered Officers must at all times conduct themselves with integrity and distinction, putting first the interests of the Fund(s) they serve. Covered Officers must be honest and candid while maintaining confidentiality of information where required by law, DeAM policy or Fund policy.

Covered Officers also must, at all times, act in good faith, responsibly and with due care, competence and diligence, without misrepresenting or being misleading about material facts or allowing their independent judgment to be subordinated. Covered Officers also should maintain skills appropriate and necessary for the performance of their duties for the Fund(s). Covered Officers also must responsibly use and control all Fund assets and resources entrusted to them.

Covered Officers may not retaliate against others for, or otherwise discourage the reporting of, actual or apparent violations of the Officer Code or applicable laws or regulations. Covered Officers should create an environment that encourages the exchange of information, including concerns of the type that this Code is designed to address.

 

B. Conflicts of Interest

A “conflict of interest” occurs when a Covered Officer’s personal interests interfere with the interests of the Fund for which he or she serves as an officer. Covered Officers may not improperly use their position with a Fund for personal or private gain to themselves, their family, or any other person. Similarly, Covered Officers may not use their personal influence or personal relationships to influence decisions or other Fund business or operational matters where they would benefit personally at the Fund’s expense or to the Fund’s detriment. Covered Officers may not cause the Fund to take action, or refrain from taking action, for their personal benefit at the Fund’s expense or to the Fund’s detriment. Some examples of conflicts of interest follow (this is not an all-inclusive list): being in the position of supervising, reviewing or having any influence on the job evaluation, pay or benefit of any immediate family member who is an employee of a Fund service provider or is otherwise associated with the Fund; or having an ownership interest in, or having any consulting or employment relationship with, any Fund service provider other than DeAM or its affiliates.

Certain conflicts of interest covered by this Code arise out of the relationships between Covered Officers and the Fund that already are subject to conflict of interest provisions in the Investment Company Act and the Investment Advisers Act. For example, Covered Officers may not individually engage in certain transactions (such as the purchase or sale of securities or other property) with the Fund because of their status as “affiliated persons” of the Fund. Covered Officers must comply with applicable laws and regulations. Therefore, any violations of existing statutory and regulatory prohibitions on individual behavior could be considered a violation of this Code.

As to conflicts arising from, or as a result of the advisory relationship (or any other relationships) between the Fund and DeAM, of which the Covered Officers are also officers or employees, it is recognized by the Board that, subject to DeAM’s fiduciary duties to the Fund, the Covered Officers will in the normal course of their duties (whether formally for the Fund or for DeAM, or for both) be involved in establishing policies and implementing decisions which will have different effects on DeAM and the Fund. The Board recognizes that the participation of the Covered Officers in such activities is inherent in the contract relationship between the Fund and DeAM, and is consistent with the expectation of the Board of the performance by the Covered Officers of their duties as officers of the Fund.

Covered Officers should avoid actual conflicts of interest, and appearances of conflicts of interest, between the Covered Officer’s duties to the Fund and his or her personal interests beyond those contemplated or anticipated by applicable regulatory schemes. If a Covered Officer suspects or knows of a conflict or an appearance of one, the Covered Officer must immediately report the matter to the DeAM Compliance Officer. If a Covered Officer, in lieu of reporting such a matter to the DeAM Compliance Officer, may report the matter directly to the Fund’s Board (or committee thereof), as appropriate (e.g., if the conflict involves the DeAM Compliance Officer or the Covered Officer reasonably believes it would be futile to report the matter to the DeAM Compliance Officer).

When actual, apparent or suspected conflicts of interest arise in connection with a Covered Officer, DeAM personnel aware of the matter should promptly contact the DeAM Compliance Officer. There will be no reprisal or retaliation against the person reporting the matter.

Upon receipt of a report of a possible conflict, the DeAM Compliance Officer will take steps to determine whether a conflict exists. In so doing, the DeAM Compliance Officer may take any actions he or she determines to be appropriate in his or her sole discretion and may use all reasonable resources, including retaining or engaging legal counsel, accounting firms or other consultants, subject to applicable law.² The costs associated with such actions may be borne by the Fund, if appropriate, after consultation with the Fund’s Board (or committee thereof). Otherwise, such costs will be borne by DeAM or other appropriate Fund service provider.

After full review of a report of a possible conflict of interest, the DeAM Compliance Officer may determine that no conflict or reasonable appearance of a conflict exists. If, however, the DeAM Compliance Officer determines that an actual conflict exists, the Compliance Officer will resolve the conflict solely in the interests of the Fund, and will report the conflict and its resolution to the Fund’s Board (or committee thereof). If the DeAM Compliance Officer determines that the appearance of a conflict exists, the DeAM Compliance Officer will take appropriate steps to remedy such appearance. In lieu of determining whether a conflict exists and/or resolving a conflict, the DeAM Compliance Officer instead may refer the matter to the Fund’s Board (or committee thereof), as appropriate. However, the DeAM Compliance Officer must refer the matter to the Fund’s Board (or committee thereof) if the DeAM Compliance Officer is directly involved in the conflict or under similar appropriate circumstances.

After responding to a report of a possible conflict of interest, the DeAM Compliance Officer will discuss the matter with the person reporting it (and with the Covered Officer at issue, if different) for purposes of educating those involved on conflicts of interests (including how to detect and avoid them, if appropriate).

_________________________

² For example, retaining a Fund’s independent accounting firm may require pre-approval by the Fund’s audit committee.

Appropriate resolution of conflicts may restrict the personal activities of the Covered Officer and/or his family, friends or other persons.

Solely because a conflict is disclosed to the DeAM Compliance Officer (and/or the Board or Committee thereof) and/or resolved by the DeAM Compliance Officer does not mean that the conflict or its resolution constitutes a waiver from the Code’s requirements.

Any questions about conflicts of interests, including whether a particular situation might be a conflict or an appearance of one, should be directed to the DeAM Compliance Officer.

 

C. Use of Personal Fund Shareholder Information

A Covered Officer may not use or disclose personal information about Fund shareholders, except in the performance of his or her duties for the Fund. Each Covered Officer also must abide by the Funds’ and DeAM’s privacy policies under SEC Regulation S-P.

 

D. Public Communications

In connection with his or her responsibilities for or involvement with a Fund’s public communications and disclosure documents (e.g., shareholder reports, registration statements, press releases), each Covered Officer must provide information to Fund service providers (within the DeAM organization or otherwise) and to the Fund’s Board (and any committees thereof), independent auditors, government regulators and self-regulatory organizations that is fair, accurate, complete, objective, relevant, timely and understandable.

Further, within the scope of their duties, Covered Officers having direct or supervisory authority over Fund disclosure documents or other public Fund communications will, to the extent appropriate within their area of responsibility, endeavor to ensure full, fair, timely, accurate and understandable disclosure in Fund disclosure documents. Such Covered Officers will oversee, or appoint others to oversee, processes for the timely and accurate creation and review of all public reports and regulatory filings. Within the scope of his or her responsibilities as a Covered Officer, each Covered Officer also will familiarize himself or herself with the disclosure requirements applicable to the Fund, as well as the business and financial operations of the Fund. Each Covered Officer also will adhere to, and will promote adherence to, applicable disclosure controls, processes and procedures, including DeAM’s Disclosure Controls and Procedures, which govern the process by which Fund disclosure documents are created and reviewed.

To the extent that Covered Officers participate in the creation of a Fund’s books or records, they must do so in a way that promotes the accuracy, fairness and timeliness of those records.

 

E. Compliance with Applicable Laws, Rules and Regulations

In connection with his or her duties and within the scope of his or her responsibilities as a Covered Officer, each Covered Officer must comply with governmental laws, rules and regulations, accounting standards, and Fund policies/procedures that apply to his or her role, responsibilities and duties with respect to the Funds (“Applicable Laws”). These requirements do not impose on Covered Officers any additional substantive duties. Additionally, Covered Officers should promote compliance with Applicable Laws.

If a Covered Officer knows of any material violations of Applicable Laws or suspects that such a violation may have occurred, the Covered Officer is expected to promptly report the matter to the DeAM Compliance Officer.

 

IV. Violation Reporting

 

A. Overview

Each Covered Officer must promptly report to the DeAM Compliance Officer, and promote the reporting of, any known or suspected violations of the Officer Code. Failure to report a violation may be a violation of the Officer Code.

Examples of violations of the Officer Code include, but are not limited to, the following:

• Unethical or dishonest behavior

• Obvious lack of adherence to policies surrounding review and approval of public communications and regulatory filings

• Failure to report violations of the Officer Code

• Known or obvious deviations from Applicable Laws

• Failure to acknowledge and certify adherence to the Officer Code

The DeAM Compliance Officer has the authority to take any and all action he or she considers appropriate in his or her sole discretion to investigate known or suspected Code violations, including consulting with the Fund’s Board, the independent Board members, a Board committee, the Fund’s legal counsel and/or counsel to the independent Board members. The Compliance Officer also has the authority to use all reasonable resources to investigate violations, including retaining or engaging legal counsel, accounting firms or other consultants, subject to applicable law.³ The costs associated with such actions may be borne by the Fund, if appropriate, after consultation with the Fund’s Board (or committee thereof). Otherwise, such costs will be borne by DeAM.

 

B. How to Report

Any known or suspected violations of the Officer Code must be promptly reported to the DeAM Compliance Officer.

 

C. Process for Violation Reporting to the Fund Board

The DeAM Compliance Officer will promptly report any violations of the Code to the Fund’s Board (or committee thereof).

 

D. Sanctions for Code Violations

Violations of the Code will be taken seriously. In response to reported or otherwise known violations, DeAM and the relevant Fund’s Board may impose sanctions within the scope of their respective authority over the Covered Officer at issue. Sanctions imposed by DeAM could include termination of employment. Sanctions imposed by a Fund’s Board could include termination of association with the Fund.

_________________________

³ For example, retaining a Fund’s independent accounting firm may require pre-approval by the Fund’s audit committee.

 

V. Waivers from the Officer Code

A Covered Officer may request a waiver from the Officer Code by transmitting a written request for a waiver to the DeAM Compliance Officer.⁴ The request must include the rationale for the request and must explain how the waiver would be in furtherance of the standards of conduct described in and underlying purposes of the Officer Code. The DeAM Compliance Officer will present this information to the Fund’s Board (or committee thereof). The Board (or committee) will determine whether to grant the requested waiver. If the Board (or committee) grants the requested waiver, the DeAM Compliance Officer thereafter will monitor the activities subject to the waiver, as appropriate, and will promptly report to the Fund’s Board (or committee thereof) regarding such activities, as appropriate.

The DeAM Compliance Officer will coordinate and facilitate any required public disclosures of any waivers granted or any implicit waivers.

 

VI. Amendments to the Code

The DeAM Compliance Officer will review the Officer Code from time to time for its continued appropriateness and will propose any amendments to the Fund’s Board (or committee thereof) on a timely basis. In addition, the Board (or committee thereof) will review the Officer Code at least annually for its continued appropriateness and may amend the Code as necessary or appropriate.

The DeAM Compliance Officer will coordinate and facilitate any required public disclosures of Code amendments.

 

VII. Acknowledgement and Certification of Adherence to the Officer Code

Each Covered Officer must sign a statement upon appointment as a Covered Officer and annually thereafter acknowledging that he or she has received and read the Officer Code, as amended or updated, and confirming that he or she has complied with it (see Appendix B: Acknowledgement and Certification of Obligations Under the Officer Code).

Understanding and complying with the Officer Code and truthfully completing the Acknowledgement and Certification Form is each Covered Officer’s obligation.

The DeAM Compliance Officer will maintain such Acknowledgements in the Fund’s books and records.

VIII. Scope of Responsibilities

A Covered Officer’s responsibilities under the Officer Code are limited to:

_________________________

⁴ Of course, it is not a waiver of the Officer Code if the Fund’s Board (or committee thereof) determines that a matter is not a deviation from the Officer Code’s requirements or is otherwise not covered by the Code.

(1) Fund matters over which the Officer has direct responsibility or control, matters in which the Officer routinely participates, and matters with which the Officer is otherwise involved (i.e., matters within the scope of the Covered Officer’s responsibilities as a Fund officer); and

(2) Fund matters of which the Officer has actual knowledge.

 

IX. Recordkeeping

The DeAM Compliance Officer will create and maintain appropriate records regarding the implementation and operation of the Officer Code, including records relating to conflicts of interest determinations and investigations of possible Code violations.

 

X. Confidentiality

All reports and records prepared or maintained pursuant to this Officer Code shall be considered confidential and shall be maintained and protected accordingly. Except as otherwise required by law or this Officer Code, such matters shall not be disclosed to anyone other than the DeAM Compliance Officer, the Fund’s Board (or committee thereof), legal counsel, independent auditors, and any consultants engaged by the Compliance Officer.

Appendices

Appendix A:

List of Officers Covered under the Code, by Board:

Fund Board	Principal Executive Officers	Principal Financial Officers	Treasurer
DWS Funds	Michael Clark	Paul Schubert	Paul Schubert
Germany*	Michael Clark	Paul Schubert	Paul Schubert

* Central Europe and Russia, European Equity, and New Germany Funds

DeAM Compliance Officer:

Joseph S. Yuen

Code of Ethics Compliance

212-454-7443

212-454-4703 fax

As of: Jan 1, 2009

Appendix B: Acknowledgement and Certification

Initial Acknowledgement and Certification

of Obligations Under the Officer Code

Print Name Department Location Telephone

1. I acknowledge and certify that I am a Covered Officer under the DWS Investments Principal Executive and Financial Officer Code of Ethics (“Officer Code”), and therefore subject to all of its requirements and provisions.

2. I have received and read the Officer Code and I understand the requirements and provisions set forth in the Officer Code.

3. I have disclosed any conflicts of interest of which I am aware to the DeAM Compliance Officer.

4. I will act in the best interest of the Funds for which I serve as an officer and have maintained the confidentiality of personal information about Fund shareholders.

5. I will report any known or suspected violations of the Officer Code in a timely manner to the DeAM Compliance Officer.

___________________________________________________________________________________

SignatureDate

Annual Acknowledgement and Certification

of Obligations Under the Officer Code

Print Name Department Location Telephone

1. I acknowledge and certify that I am a Covered Officer under the DWS Investments Principal Executive and Financial Officer Code of Ethics (“Officer Code”), and therefore subject to all of its requirements and provisions.

2. I have received and read the Officer Code, and I understand the requirements and provisions set forth in the Officer Code.

3. I have adhered to the Officer Code.

4. I have not knowingly been a party to any conflict of interest, nor have I had actual knowledge about actual or apparent conflicts of interest that I did not report to the DeAM Compliance Officer in accordance with the Officer Code’s requirements.

5. I have acted in the best interest of the Funds for which I serve as an officer and have maintained the confidentiality of personal information about Fund shareholders.

6. With respect to the duties I perform for the Fund as a Fund officer, I believe that effective processes are in place to create and file public reports and documents in accordance with applicable regulations.

7. With respect to the duties I perform for the Fund as a Fund officer, I have complied to the best of my knowledge with all Applicable Laws (as that term is defined in the Officer Code) and have appropriately monitored those persons under my supervision for compliance with Applicable Laws.

8. I have reported any known or suspected violations of the Officer Code in a timely manner to the DeAM Compliance Officer.

Signature Date

Appendix C: Definitions

Principal Executive Officer

Individual holding the office of President of the Fund or series of Funds, or a person performing a similar function.

Principal Financial Officer

Individual holding the office of Treasurer of the Fund or series of Funds, or a person performing a similar function.

Registered Investment Management Investment Company

Registered investment companies other than a face-amount certificate company or a unit investment trust.

Waiver

A waiver is an approval of an exemption from a Code requirement.

Implicit Waiver

An implicit waiver is the failure to take action within a reasonable period of time regarding a material departure from a requirement or provision of the Officer Code that has been made known to the DeAM Compliance Officer or the Fund’s Board (or committee thereof).

EX-99.CERT

President

Form N-CSR Certification under Sarbanes Oxley Act

I, Michael G. Clark, certify that:

1. I have reviewed this report, filed on behalf of Government & Agency Securities Portfolio (DWS Government Cash Institutional Shares, Government Cash Managed Shares), a series of Cash Account Trust, on Form N-CSR;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls

and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize, and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

June 29, 2010	/s/Michael G. Clark
	Michael G. Clark
	President
	Government & Agency Securities Portfolio (DWS Government Cash Institutional Shares, Government Cash Managed Shares), a series of Cash Account Trust

Chief Financial Officer and Treasurer

Form N-CSR Certification under Sarbanes Oxley Act

I, Paul Schubert, certify that:

1. I have reviewed this report, filed on behalf of Government & Agency Securities Portfolio (DWS Government Cash Institutional Shares, Government Cash Managed Shares), a series of Cash Account Trust, on Form N-CSR;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls

and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize, and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

June 29, 2010	/s/Paul Schubert
	Paul Schubert
	Chief Financial Officer and Treasurer
	Government & Agency Securities Portfolio (DWS Government Cash Institutional Shares, Government Cash Managed Shares), a series of Cash Account Trust

EX-99.906CERT

President

Section 906 Certification under Sarbanes Oxley Act

I, Michael G. Clark, certify that:

1. I have reviewed this report, filed on behalf of Government & Agency Securities Portfolio (DWS Government Cash Institutional Shares, Government Cash Managed Shares), a series of Cash Account Trust, on Form N-CSR;

2. Based on my knowledge and pursuant to 18 U.S.C. § 1350, the periodic report on Form N-CSR (the “Report”) fully complies with the requirements of § 13 (a) or §15 (d), as applicable, of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

June 29, 2010	/s/Michael G. Clark
	Michael G. Clark
	President
	Government & Agency Securities Portfolio (DWS Government Cash Institutional Shares, Government Cash Managed Shares), a series of Cash Account Trust

Chief Financial Officer and Treasurer

Section 906 Certification under Sarbanes Oxley Act

I, Paul Schubert, certify that:

1. I have reviewed this report, filed on behalf of Government & Agency Securities Portfolio (DWS Government Cash Institutional Shares, Government Cash Managed Shares), a series of Cash Account Trust, on Form N-CSR;

2. Based on my knowledge and pursuant to 18 U.S.C. § 1350, the periodic report on Form N-CSR (the “Report”) fully complies with the requirements of § 13 (a) or § 15 (d), as applicable, of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

June 29, 2010	/s/Paul Schubert
	Paul Schubert
	Chief Financial Officer and Treasurer
	Government & Agency Securities Portfolio (DWS Government Cash Institutional Shares, Government Cash Managed Shares), a series of Cash Account Trust