UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANIES

Investment Company Act File Number 811-499

RIVERSOURCE INCOME SERIES, INC.

(Exact name of registrant as specified in charter)

50606 Ameriprise Financial Center, Minneapolis, Minnesota	55474
(Address of principal executive offices)	(Zip code)

Scott R. Plummer — 5228 Ameriprise Financial Center, Minneapolis, MN 55474

(Name and address of agent for service)

Registrant’s telephone number, including area code: (612) 671-1947

Date of fiscal year end: 1/31

Date of reporting period: 4/30

Investments in Affiliated Funds
RiverSource Income Builder Basic Income Fund
April 30, 2010 (Unaudited)

(Percentages represent value of investments compared to net assets)

Equity Funds (29.9%)

	Shares			Value(a)
Dividend Income (8.0%)
RiverSource Dividend Opportunity Fund		2,628,203		$	18,870,500
International (0.1%)
RiverSource Disciplined International Equity Fund		39,931			279,515
Real Estate (2.2%)
RiverSource Real Estate Fund		488,671			5,067,515
U.S. Large Cap (12.8%)
RiverSource Disciplined Equity Fund		3,736,915			19,170,373
RiverSource Disciplined Large Cap Value Fund		1,280,232			10,958,785
Total					30,129,158
U.S. Small Cap (6.8%)
RiverSource Disciplined Small Cap Value Fund		1,865,406	(c)		15,893,262
Total Equity Funds (Cost: $70,868,415)				$	70,239,950

Fixed Income Funds (60.7%)

	Shares			Value(a)
Floating Rate (5.9%)
RiverSource Floating Rate Fund		1,583,749		$	13,889,475
Global Bond (0.5%)
RiverSource Global Bond Fund		164,517			1,145,035
High Yield (15.0%)
RiverSource High Yield Bond Fund		11,824,532			32,162,726
RiverSource Income Opportunities Fund		313,972			3,061,229
Total					35,223,955
Inflation Protected Securities (8.8%)
RiverSource Inflation Protected Securities Fund		2,002,193			20,622,589
International (4.9%)
RiverSource Emerging Markets Bond Fund		1,046,678			11,492,523
Investment Grade (25.6%)
RiverSource Diversified Bond Fund		5,309,114			26,173,934
RiverSource U.S. Government Mortgage Fund		6,620,339	(c)		33,829,934
Total					60,003,868
Total Fixed Income Funds (Cost: $131,407,876)				$	142,377,445

Alternative Investments (4.4%)

	Shares			Value(a)
RiverSource Absolute Return Currency and Income Fund		1,015,821	(b)	$	10,259,789
Total Alternative Investments (Cost: $10,124,478)				$	10,259,789

Cash Equivalents (4.9%)

	Shares		Value(a)
Money Market
RiverSource Cash Management Fund		11,608,981	$	11,608,981
Total Cash Equivalents (Cost: $11,608,981)			$	11,608,981
Total Investments in Affiliated Funds (Cost: $224,009,750)(d)			$	234,486,165

Notes to Investments in Affiliated Funds

(a)	Securities are valued by using policies described in Note 2 to the financial statements in the most recent Annual Report dated Jan. 31, 2010.
(b)	Non-income producing.
(c)	The fund does not invest in underlying funds for the purpose of exercising management or control. At April 30, 2010, the fund held the following positions, which exceed 5% of the underlying fund’s shares outstanding:

Underlying fund	Percent of shares held
RiverSource Disciplined Small Cap Value Fund		26.27	%
RiverSource U.S. Government Mortgage Fund		14.61

(d) At April 30, 2010, the cost of securities for federal income tax purposes was approximately $224,010,000 and the approximate aggregate gross unrealized appreciation and depreciation based on that cost was:

Unrealized appreciation	$	19,410,000
Unrealized depreciation		(8,934,000	)
Net unrealized appreciation	$	10,476,000

Fair Value Measurements

Generally accepted accounting principles (GAAP) require disclosure regarding the inputs and valuation techniques used to measure fair value and any changes in valuation inputs or techniques. In addition, investments shall be disclosed by major category.

The Fund categorizes its fair value measurements according to a three-level hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs by prioritizing that the most observable input be used when available. Observable inputs are those that market participants would use in pricing an investment based on market data obtained from sources independent of the reporting entity. Unobservable inputs are those that reflect the Fund’s assumptions about the information market participants would use in pricing an investment. An investment’s level within the fair value hierarchy is based on the lowest level of any input that is deemed significant to the asset or liability’s fair value measurement. The input levels are not necessarily an indication of the risk or liquidity associated with investments at that level. For example, certain U.S. government securities are generally high quality and liquid, however, they are reflected as Level 2 because the inputs used to determine fair value may not always be quoted prices in an active market.

Fair value inputs are summarized in the three broad levels listed below:

• Level 1 — Valuations based on quoted prices for investments in active markets that the Fund has the ability to access at the measurement date. Valuation adjustments are not applied to Level 1 investments.

• Level 2 — Valuations based on other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.).

• Level 3 — Valuations based on significant unobservable inputs (including the Fund’s own assumptions and judgment in determining the fair value of investments).

Inputs that are used in determining fair value of an investment may include price information, credit data, volatility statistics, and other factors. These inputs can be either observable or unobservable. The availability of observable inputs can vary between investments, and is affected by various factors such as the type of investment, and the volume and level of activity for that investment or similar investments in the marketplace. The inputs will be considered by the Fund Administrator, along with any other relevant factors in the calculation of an investment’s fair value. The Fund uses prices and inputs that are current as of the measurement date, which may include periods of market dislocations. During these periods, the availability of prices and inputs may be reduced for many investments. This condition could cause an investment to be reclassified between the various levels within the hierarchy.

Investments falling into the Level 3 category are primarily supported by quoted prices from brokers and dealers participating in the market for those investments. However, these may be classified as Level 3 investments due to lack of market transparency and corroboration to support these quoted prices. Additionally, valuation models may be used as the pricing source for any remaining investments classified as Level 3. These models rely on one or more significant unobservable inputs and/or significant assumptions by the Fund Administrator. Inputs used in a valuation model may include, but are not limited to, financial statement analysis, discount rates and estimated cash flows, and comparable company data.

The following table is a summary of the inputs used to value the Fund’s investments as of April 30, 2010:

	Fair value at April 30, 2010
	Level 1		Level 2
	quoted prices		other		Level 3
	in active		significant		significant
	markets for		observable		unobservable
Description	identical assets		inputs		inputs		Total
Investments in Affiliated Funds	$	234,486,165	$	—	$	—	$	234,486,165

Investments in Affiliated Funds
RiverSource Income Builder Moderate Income Fund
April 30, 2010 (Unaudited)

(Percentages represent value of investments compared to net assets)

Equity Funds (34.5%)

	Shares			Value(a)
Dividend Income (9.5%)
RiverSource Dividend Opportunity Fund		5,159,756		$	37,047,047
International (3.9%)
RiverSource Disciplined International Equity Fund		2,187,520			15,312,637
Real Estate (5.0%)
RiverSource Real Estate Fund		1,894,901	(c)		19,650,126
U.S. Large Cap (9.6%)
RiverSource Disciplined Equity Fund		4,834,527			24,801,124
RiverSource Disciplined Large Cap Value Fund		1,447,898			12,394,009
Total					37,195,133
U.S. Small Cap (6.5%)
RiverSource Disciplined Small Cap Value Fund		3,002,196	(c)		25,578,709
Total Equity Funds (Cost: $138,593,734)				$	134,783,652

Fixed Income Funds (62.2%)

	Shares			Value(a)
Floating Rate (11.3%)
RiverSource Floating Rate Fund		5,040,242	(c)	$	44,202,919
Global Bond (1.1%)
RiverSource Global Bond Fund		635,312			4,421,771
High Yield (18.0%)
RiverSource High Yield Bond Fund		21,284,049			57,892,612
RiverSource Income Opportunities Fund		1,297,458			12,650,216
Total					70,542,828
Inflation Protected Securities (2.6%)
RiverSource Inflation Protected Securities Fund		997,913			10,278,504
International (8.6%)
RiverSource Emerging Markets Bond Fund		3,070,839	(c)		33,717,817
Investment Grade (20.6%)
RiverSource Diversified Bond Fund		7,681,817			37,871,358
RiverSource U.S. Government Mortgage Fund		8,253,403	(c)		42,174,888
Total					80,046,246
Total Fixed Income Funds (Cost: $225,561,626)				$	243,210,085

Alternative Investments (3.3%)

	Shares			Value(a)
RiverSource Absolute Return Currency and Income Fund		1,268,247	(b,c)	$	12,809,291
Total Alternative Investments (Cost: $13,115,945)				$	12,809,291

Cash Equivalents (—%)

	Shares		Value(a)
Money Market
RiverSource Cash Management Fund		100,642	$	100,642
Total Cash Equivalents (Cost: $100,642)			$	100,642
Total Investments in Affiliated Funds (Cost: $377,371,947)(d)			$	390,903,670

Notes to Investments in Affiliated Funds

(a)	Securities are valued by using policies described in Note 2 to the financial statements in the most recent Annual Report dated Jan. 31, 2010.
(b)	Non-income producing.
(c)	The fund does not invest in underlying funds for the purpose of exercising management or control. At April 30, 2010, the fund held the following positions, which exceed 5% of the underlying fund’s shares outstanding:

Underlying fund	Percent of shares held
RiverSource Disciplined Small Cap Value Fund		42.32	%
RiverSource U.S. Government Mortgage Fund		18.22
RiverSource Emerging Markets Bond Fund		13.24
RiverSource Floating Rate Fund		9.49
RiverSource Real Estate Fund		9.11
RiverSource Absolute Return Currency and Income Fund		6.19

(d) At April 30, 2010, the cost of securities for federal income tax purposes was approximately $377,372,000 and the approximate aggregate gross unrealized appreciation and depreciation based on that cost was:

Unrealized appreciation	$	32,991,000
Unrealized depreciation		(19,459,000	)
Net unrealized appreciation	$	13,532,000

Fair Value Measurements

Generally accepted accounting principles (GAAP) require disclosure regarding the inputs and valuation techniques used to measure fair value and any changes in valuation inputs or techniques. In addition, investments shall be disclosed by major category.

The Fund categorizes its fair value measurements according to a three-level hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs by prioritizing that the most observable input be used when available. Observable inputs are those that market participants would use in pricing an investment based on market data obtained from sources independent of the reporting entity. Unobservable inputs are those that reflect the Fund’s assumptions about the information market participants would use in pricing an investment. An investment’s level within the fair value hierarchy is based on the lowest level of any input that is deemed significant to the asset or liability’s fair value measurement. The input levels are not necessarily an indication of the risk or liquidity associated with investments at that level. For example, certain U.S. government securities are generally high quality and liquid, however, they are reflected as Level 2 because the inputs used to determine fair value may not always be quoted prices in an active market.

Fair value inputs are summarized in the three broad levels listed below:

• Level 1 — Valuations based on quoted prices for investments in active markets that the Fund has the ability to access at the measurement date. Valuation adjustments are not applied to Level 1 investments.

• Level 2 — Valuations based on other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.).

• Level 3 — Valuations based on significant unobservable inputs (including the Fund’s own assumptions and judgment in determining the fair value of investments).

Inputs that are used in determining fair value of an investment may include price information, credit data, volatility statistics, and other factors. These inputs can be either observable or unobservable. The availability of observable inputs can vary between investments, and is affected by various factors such as the type of investment, and the volume and level of activity for that investment or similar investments in the marketplace. The inputs will be considered by the Fund Administrator, along with any other relevant factors in the calculation of an investment’s fair value. The Fund uses prices and inputs that are current as of the measurement date, which may include periods of market dislocations. During these periods, the availability of prices and inputs may be reduced for many investments. This condition could cause an investment to be reclassified between the various levels within the hierarchy.

Investments falling into the Level 3 category are primarily supported by quoted prices from brokers and dealers participating in the market for those investments. However, these may be classified as Level 3 investments due to lack of market transparency and corroboration to support these quoted prices. Additionally, valuation models may be used as the pricing source for any remaining investments classified as Level 3. These models rely on one or more significant unobservable inputs and/or significant assumptions by the Fund Administrator. Inputs used in a valuation model may include, but are not limited to, financial statement analysis, discount rates and estimated cash flows, and comparable company data.

The following table is a summary of the inputs used to value the Fund’s investments as of April 30, 2010:

	Fair value at April 30, 2010
	Level 1		Level 2
	quoted prices		other		Level 3
	in active		significant		significant
	markets for		observable		unobservable
Description	identical assets		inputs		inputs		Total
Investments in Affiliated Funds	$	390,903,670	$	—	$	—	$	390,903,670

Investments in Affiliated Funds

RiverSource Income Builder Enhanced Income Fund
April 30, 2010 (Unaudited)

(Percentages represent value of investments compared to net assets)

Equity Funds (32.9%)

	Shares			Value(a)
Dividend Income (8.2%)
RiverSource Dividend Opportunity Fund		2,297,662		$	16,497,210
International (5.2%)
RiverSource Disciplined International Equity Fund		1,470,084			10,290,588
Real Estate (8.0%)
RiverSource Real Estate Fund		1,521,357	(c)		15,776,476
U.S. Large Cap (4.2%)
RiverSource Disciplined Equity Fund		1,305,018			6,694,743
RiverSource Disciplined Large Cap Value Fund		183,554			1,571,219
Total					8,265,962
U.S. Small Cap (7.3%)
RiverSource Disciplined Small Cap Value Fund		1,702,280	(c)		14,503,429
Total Equity Funds (Cost: $61,258,563)				$	65,333,665

Fixed Income Funds (65.2%)

	Shares			Value(a)
Floating Rate (12.3%)
RiverSource Floating Rate Fund		2,777,028	(c)	$	24,354,532
Global Bond (0.6%)
RiverSource Global Bond Fund		170,249			1,184,933
High Yield (23.2%)
RiverSource High Yield Bond Fund		13,134,141			35,724,861
RiverSource Income Opportunities Fund		1,048,308			10,221,007
Total					45,945,868
Inflation Protected Securities (2.2%)
RiverSource Inflation Protected Securities Fund		428,609			4,414,677
International (10.0%)
RiverSource Emerging Markets Bond Fund		1,805,149	(c)		19,820,534
Investment Grade (16.9%)
RiverSource Diversified Bond Fund		3,773,508			18,603,393
RiverSource U.S. Government Mortgage Fund		2,932,280	(c)		14,983,949
Total					33,587,342
Total Fixed Income Funds (Cost: $120,556,920)				$	129,307,886

Alternative Investments (1.8%)

	Shares			Value(a)
RiverSource Absolute Return Currency and Income Fund		350,067	(b)	$	3,535,677
Total Alternative Investments (Cost: $3,556,043)				$	3,535,677

Cash Equivalents (0.1%)

	Shares		Value(a)
Money Market
RiverSource Cash Management Fund		139,779	$	139,779
Total Cash Equivalents (Cost: $139,779)			$	139,779
Total Investments in Affiliated Funds (Cost: $185,511,305)(d)			$	198,317,007

Notes to Investments in Affiliated Funds

(a)	Securities are valued by using policies described in Note 2 to the financial statements in the most recent Annual Report dated Jan. 31, 2010.
(b)	Non-income producing.
(c)	The fund does not invest in underlying funds for the purpose of exercising management or control. At April 30, 2010, the fund held the following positions, which exceed 5% of the underlying fund’s shares outstanding:

Underlying fund	Percent of shares held
RiverSource Disciplined Small Cap Value Fund		23.99	%
RiverSource Emerging Markets Bond Fund		7.78
RiverSource Real Estate Fund		7.31
RiverSource U.S. Government Mortgage Fund		6.47
RiverSource Floating Rate Fund		5.23

(d) At April 30, 2010, the cost of securities for federal income tax purposes was approximately $185,511,000 and the approximate aggregate gross unrealized appreciation and depreciation based on that cost was:

Unrealized appreciation	$	19,287,000
Unrealized depreciation		(6,481,000	)
Net unrealized appreciation	$	12,806,000

Fair Value Measurements

Generally accepted accounting principles (GAAP) require disclosure regarding the inputs and valuation techniques used to measure fair value and any changes in valuation inputs or techniques. In addition, investments shall be disclosed by major category.

The Fund categorizes its fair value measurements according to a three-level hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs by prioritizing that the most observable input be used when available. Observable inputs are those that market participants would use in pricing an investment based on market data obtained from sources independent of the reporting entity. Unobservable inputs are those that reflect the Fund’s assumptions about the information market participants would use in pricing an investment. An investment’s level within the fair value hierarchy is based on the lowest level of any input that is deemed significant to the asset or liability’s fair value measurement. The input levels are not necessarily an indication of the risk or liquidity associated with investments at that level. For example, certain U.S. government securities are generally high quality and liquid, however, they are reflected as Level 2 because the inputs used to determine fair value may not always be quoted prices in an active market.

Fair value inputs are summarized in the three broad levels listed below:

• Level 1 — Valuations based on quoted prices for investments in active markets that the Fund has the ability to access at the measurement date. Valuation adjustments are not applied to Level 1 investments.

• Level 2 — Valuations based on other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.).

• Level 3 — Valuations based on significant unobservable inputs (including the Fund’s own assumptions and judgment in determining the fair value of investments).

Inputs that are used in determining fair value of an investment may include price information, credit data, volatility statistics, and other factors. These inputs can be either observable or unobservable. The availability of observable inputs can vary between investments, and is affected by various factors such as the type of investment, and the volume and level of activity for that investment or similar investments in the marketplace. The inputs will be considered by the Fund Administrator, along with any other relevant factors in the calculation of an investment’s fair value. The Fund uses prices and inputs that are current as of the measurement date, which may include periods of market dislocations. During these periods, the availability of prices and inputs may be reduced for many investments. This condition could cause an investment to be reclassified between the various levels within the hierarchy.

Investments falling into the Level 3 category are primarily supported by quoted prices from brokers and dealers participating in the market for those investments. However, these may be classified as Level 3 investments due to lack of market transparency and corroboration to support these quoted prices. Additionally, valuation models may be used as the pricing source for any remaining investments classified as Level 3. These models rely on one or more significant unobservable inputs and/or significant assumptions by the Fund Administrator. Inputs used in a valuation model may include, but are not limited to, financial statement analysis, discount rates and estimated cash flows, and comparable company data.

The following table is a summary of the inputs used to value the Fund’s investments as of April 30, 2010:

	Fair value at April 30, 2010
	Level 1		Level 2
	quoted prices		other		Level 3
	in active		significant		significant
	markets for		observable		unobservable
Description	identical assets		inputs		inputs		Total
Investments in Affiliated Funds	$	198,317,007	$	—	$	—	$	198,317,007

Item 2. Control and Procedures.

(a) Based upon their evaluation of the registrant’s disclosure controls and procedures as conducted within 90 days of the filing date of this report, the registrant’s principal financial officer and principal executive officer have concluded that those disclosure controls and procedures provide reasonable assurance that the material information required to be disclosed by the registrant on this report is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms.

(b) There were no changes in the registrant’s internal control over financial reporting that occurred during the registrant’s last fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

Item 3. Exhibits.

Separate certification for the Registrant’s principal executive officer and principal financial officer as required by Rule 30a-2(a) under the Investment Company Act of 1940.

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) RiverSource Income Series, Inc.

By	/s/ J. Kevin Connaughton
	J. Kevin Connaughton
	President and Principal Executive Officer
Date	June 28, 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.

By	/s/ J. Kevin Connaughton J. Kevin Connaughton
	President and Principal Executive Officer
Date	June 28, 2010
By	/s/ Jeffrey P. Fox
	Jeffrey P. Fox
	Treasurer and Principal Financial Officer
Date	June 28, 2010