UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED

MANAGEMENT INVESTMENT COMPANIES

Investment Company Act File Number: 811-22049

International Income Portfolio

(Exact Name of Registrant as Specified in Charter)

Two International Place, Boston, Massachusetts 02110

(Address of Principal Executive Offices)

Maureen A. Gemma

Two International Place, Boston, Massachusetts 02110

(Name and Address of Agent for Services)

(617) 482-8260

(Registrant’s Telephone Number)

October 31

Date of Fiscal Year End

April 30, 2020

Date of Reporting Period

Item 1. Reports to Stockholders

International Income Portfolio

April 30, 2020

Portfolio of Investments (Unaudited)

Foreign Government Bonds— 23.5%
Security		Principal Amount (000’s omitted)		Value
Georgia — 0.2%
Georgia Treasury Bond, 7.00%, 5/30/24	GEL		430	$	121,797
Total Georgia				$	121,797
Iceland — 3.8%
Republic of Iceland, 5.00%, 11/15/28	ISK		59,300	$	491,043
Republic of Iceland, 6.50%, 1/24/31	ISK		184,200		1,764,360
Total Iceland				$	2,255,403
Indonesia — 0.7%
Indonesia Government International Bond, 3.85%, 10/15/30	USD		375	$	389,320
Total Indonesia				$	389,320
New Zealand — 5.4%
New Zealand Government Bond, 3.00%, 9/20/30 (1)(2)	NZD		3,988	$	3,158,273
Total New Zealand				$	3,158,273
Philippines — 1.3%
Republic of the Philippines, 6.25%, 1/14/36	PHP		34,000	$	762,622
Total Philippines				$	762,622
Serbia — 7.1%
Serbia Treasury Bond, 5.875%, 2/8/28	RSD		370,200	$	4,166,504
Total Serbia				$	4,166,504
Ukraine — 5.0%
Ukraine Government International Bond, 14.64%, 6/10/20	UAH		19,125	$	711,648
Ukraine Government International Bond, 15.70%, 1/20/21	UAH		30,860		1,149,594
Ukraine Government International Bond, 18.00%, 3/24/21	UAH		28,055		1,065,716
Total Ukraine				$	2,926,958
Total Foreign Government Bonds (identified cost $14,027,208)				$	13,780,877

Foreign Corporate Bonds— 3.3%
Security		Principal Amount (000’s omitted)		Value
Iceland — 3.3%
Arion Banki HF, 6.00%, 4/12/24 (1)	ISK		100,000	$	772,829
Islandsbanki HF, 6.40%, 10/26/23	ISK		40,000		308,911
Landsbankinn HF, 5.00%, 11/23/23 (1)	ISK		120,000		888,846
Total Iceland				$	1,970,586
Total Foreign Corporate Bonds (identified cost $2,206,510)				$	1,970,586
Mortgage Pass-Throughs— 0.5%
Security		Principal Amount		Value
Federal National Mortgage Association: 4.029%, (COF + 1.77%), with maturity at 2035(3)		$	267,234	$	275,039
				$	275,039
Total Mortgage Pass-Throughs (identified cost $267,251)				$	275,039
Short-Term Investments — 64.5%
Foreign Government Securities — 7.8%
Security		Principal Amount (000’s omitted)		Value
Georgia — 2.4%
Georgia Treasury Bill, 0.00%, 6/11/20	GEL		30	$	9,262
Georgia Treasury Bill, 0.00%, 7/2/20	GEL		4,570		1,404,593
Total Georgia				$	1,413,855
United Kingdom — 5.4%
United Kingdom Gilt, 2.00%, 7/22/20 (1)	GBP		2,500	$	3,162,604
Total United Kingdom				$	3,162,604
Total Foreign Government Securities (identified cost $4,918,015)				$	4,576,459

14 See Notes to Financial Statements.

International Income Portfolio

April 30, 2020

Portfolio of Investments (Unaudited) — continued

U.S. Treasury Obligations — 52.9%
Security	Principal Amount (000’s omitted)		Value
U.S. Treasury Bill, 0.00%, 5/21/20	$	6,000	$	5,999,709
U.S. Treasury Bill, 0.00%, 6/11/20		25,000		24,997,366
Total U.S. Treasury Obligations (identified cost $30,997,132)			$	30,997,075
Other— 3.8%
Description	Units		Value
Eaton Vance Cash Reserves Fund, LLC, 0.47%(4)		2,209,289	$	2,209,289
Total Other (identified cost $2,208,636)			$	2,209,289
Total Short-Term Investments (identified cost $38,123,783)			$	37,782,823
Total Investments— 91.8% (identified cost $54,624,752)			$	53,809,325
Other Assets, Less Liabilities — 8.2%			$	4,775,807
Net Assets — 100.0%			$	58,585,132

The percentage shown for each investment category in the Portfolio of Investments is based on net assets.

⁽¹⁾  Security exempt from registration under Regulation S of the Securities Act of 1933, which exempts from registration securities offered and sold outside the United States. Security may not be offered or sold in the United States except pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act of 1933. At April 30, 2020, the aggregate value of these securities is $7,982,552 or 13.6% of the Portfolio’s net assets.

⁽²⁾  Inflation-linked security whose principal is adjusted for inflation based on changes in a designated inflation index or inflation rate for the applicable country. Interest is calculated based on the inflation-adjusted principal.

⁽³⁾  Adjustable rate mortgage security whose interest rate generally adjusts monthly based on a weighted average of interest rates on the underlying mortgages. The coupon rate may not reflect the applicable index value as interest rates on the underlying mortgages may adjust on various dates and at various intervals and may be subject to lifetime ceilings and lifetime floors and lookback periods. Rate shown is the coupon rate at April 30, 2020.

⁽⁴⁾  Affiliated investment company, available to Eaton Vance portfolios and funds, which invests in high quality, U.S. dollar denominated money market instruments. The rate shown is the annualized seven-day yield as of April 30, 2020.

Centrally Cleared Forward Foreign Currency Exchange Contracts
Currency Purchased		Currency Sold		Settlement Date		Value/ Unrealized Appreciation (Depreciation)
EUR	195,889	USD	212,820		5/8/20	$	1,856
EUR	198,000	USD	215,583		5/8/20		1,406
USD	865,648	EUR	775,740		5/8/20		15,511
USD	839,354	EUR	770,895		5/8/20		(5,474	)
USD	843,385	PHP	43,000,000		5/8/20		(9,387	)
USD	882,861	AUD	1,400,000		5/15/20		(29,477	)
CAD	3,000,000	USD	2,267,471		5/20/20		(112,190	)
USD	2,245,660	CAD	3,000,000		5/20/20		90,379
JPY	1,237,000,000	USD	11,311,059		5/21/20		217,818
EUR	1,868,860	USD	2,034,581		5/22/20		14,056
JPY	270,686,970	USD	2,444,627		5/26/20		78,348
JPY	111,476,602	USD	1,026,236		5/26/20		12,797
TWD	12,075,000	USD	406,155		6/9/20		2,332
TWD	9,425,000	USD	317,020		6/9/20		1,821
USD	728,087	AUD	1,194,876		6/9/20		(50,645	)
USD	722,811	TWD	21,500,000		6/9/20		(4,518	)

15 See Notes to Financial Statements.

International Income Portfolio

April 30, 2020

Portfolio of Investments (Unaudited) — continued

Centrally Cleared Forward Foreign Currency Exchange Contracts (continued)
Currency Purchased		Currency Sold		Settlement Date		Value/ Unrealized Appreciation (Depreciation)
JPY	108,256,147	USD	1,027,127		6/10/20	$	(17,902	)
AUD	2,241,258	USD	1,370,914		6/12/20		89,781
AUD	81,988	USD	50,150		6/12/20		3,284
AUD	2,101,000	USD	1,375,592		6/12/20		(6,307	)
USD	305,836	AUD	500,000		6/12/20		(20,029	)
GBP	959,627	USD	1,175,994		6/18/20		32,880
CAD	350,000	USD	241,688		6/22/20		9,786
EUR	23,730,000	USD	26,424,542		7/6/20		(387,046	)
USD	2,195,930	EUR	1,972,008		7/6/20		32,164
USD	2,549,652	EUR	2,359,282		7/6/20		(39,045	)
USD	2,814,229	EUR	2,604,104		7/6/20		(43,097	)
USD	3,040,377	NZD	5,111,295		7/9/20		(93,800	)
USD	1,831,552	EUR	1,618,000		7/10/20		56,063
NOK	13,196,000	USD	1,285,152		7/16/20		3,413
NZD	410,000	USD	248,829		7/17/20		2,563
USD	4,209,416	EUR	3,732,314		7/17/20		113,188
						$	(39,471	)

Forward Foreign Currency Exchange Contracts
Currency Purchased		Currency Sold		Counterparty	Settlement Date		Unrealized Appreciation		Unrealized (Depreciation)
EUR	872,100	USD	955,096	Bank of America, N.A.		5/5/20	$	593	$	—
EUR	137,800	USD	150,914	Bank of America, N.A.		5/5/20		94		—
USD	149,692	EUR	137,800	UBS AG		5/5/20		—		(1,316	)
USD	947,360	EUR	872,100	UBS AG		5/5/20		—		(8,330	)
THB	7,053,000	USD	223,267	Standard Chartered Bank		5/18/20		—		(5,275	)
EUR	627,064	NOK	7,172,000	BNP Paribas		5/26/20		—		(12,681	)
EUR	872,100	USD	947,899	UBS AG		6/2/20		8,302		—
EUR	137,800	USD	149,777	UBS AG		6/2/20		1,312		—
USD	290,521	THB	9,118,000	Standard Chartered Bank		6/8/20		8,710		—
UGX	967,448,000	USD	239,527	Standard Chartered Bank		6/15/20		12,422		—
USD	253,524	UGX	967,448,000	Standard Chartered Bank		6/15/20		1,576		—
THB	8,315,000	USD	255,770	Standard Chartered Bank		6/24/20		1,230		—
UGX	1,079,000,000	USD	269,279	Citibank, N.A.		6/26/20		11,081		—
USD	282,092	UGX	1,079,000,000	Citibank, N.A.		6/26/20		1,731		—
USD	161,461	THB	5,355,000	Standard Chartered Bank		7/1/20		—		(4,053	)
THB	26,265,000	USD	798,699	Standard Chartered Bank		7/10/20		13,118		—
SEK	2,653,993	USD	260,330	Goldman Sachs International		7/24/20		11,922		—
UGX	982,637,000	USD	247,080	Standard Chartered Bank		8/14/20		4,352		—
USD	247,514	UGX	982,637,000	Standard Chartered Bank		8/14/20		—		(3,918	)
							$	76,443	$	(35,573	)

16 See Notes to Financial Statements.

International Income Portfolio

April 30, 2020

Portfolio of Investments (Unaudited) — continued

Futures Contracts
Description	Number of Contracts			Position	Expiration Date	Notional Amount			Value/ Unrealized Depreciation
Interest Rate Futures
U.S. 10-Year Treasury Note		(3	)	Short	6/19/20	$	(417,188	)	$	(2,156	)
									$	(2,156	)

Centrally Cleared Interest Rate Swaps
Notional Amount (000’s omitted)		Portfolio Pays/Receives Floating Rate	Floating Rate	Annual Fixed Rate	Termination Date	Value	Unamortized Upfront Receipts (Payments)		Unrealized Appreciation
CNY	33,000	Pays	7-day China Fixing Repo Rates (pays quarterly)	2.94% (pays quarterly)	10/15/24	$240,090	$	—	$	240,090
MXN	24,000	Pays	Mexico Interbank TIIE 28 Day (pays monthly)	6.70% (pays monthly)	10/3/29	31,562		—		31,562
SGD	5,500	Pays	6-month Singapore Swap Offered Rate (pays semi-annually)	1.64% (pays semi-annually)	10/16/29	245,245		—		245,245
THB	70,000	Pays	6-month THB Fixing Rate (pays semi-annually)	1.37% (pays semi-annually)	10/17/29	65,094		—		65,094
ZAR	9,655	Pays	3-month ZAR JIBAR (pays quarterly)	6.88% (pays quarterly)	1/10/25	23,711		—		23,711
ZAR	11,495	Pays	3-month ZAR JIBAR (pays quarterly)	6.90% (pays quarterly)	1/10/25	28,701		—		28,701
ZAR	12,842	Pays	3-month ZAR JIBAR (pays quarterly)	6.64% (pays quarterly)	2/14/25	5,051		—		5,051
ZAR	59,928	Pays	3-month ZAR JIBAR (pays quarterly)	6.65% (pays quarterly)	2/14/25	23,726		—		23,726
Total						$663,180	$	—	$	663,180

Interest Rate Swaps
Counterparty	Notional Amount (000’s omitted)		Portfolio Pays/Receives Floating Rate	Floating Rate	Annual Fixed Rate		Termination Date		Value/ Unrealized Appreciation
Citibank, N.A.	MYR	8,000	Pays	3-month MYR KLIBOR (pays quarterly)		3.15% (pays quarterly)		10/14/24	$	77,701
Total									$	77,701

17 See Notes to Financial Statements.

International Income Portfolio

April 30, 2020

Portfolio of Investments (Unaudited) — continued

Abbreviations:

COF – Cost of Funds 11th District

Currency Abbreviations:

AUD	–	Australian Dollar
CAD	–	Canadian Dollar
CNY	–	Yuan Renminbi
EUR	–	Euro
GBP	–	British Pound Sterling
GEL	–	Georgian Lari
ISK	–	Icelandic Krona
JPY	–	Japanese Yen
MXN	–	Mexican Peso
MYR	–	Malaysian Ringgit
NOK	–	Norwegian Krone

NZD	–	New Zealand Dollar
PHP	–	Philippine Peso
RSD	–	Serbian Dinar
SEK	–	Swedish Krona
SGD	–	Singapore Dollar
THB	–	Thai Baht
TWD	–	New Taiwan Dollar
UAH	–	Ukrainian Hryvnia
UGX	–	Ugandan Shilling
USD	–	United States Dollar
ZAR	–	South African Rand

18 See Notes to Financial Statements.

International Income Portfolio

April 30, 2020

Statement of Assets and Liabilities (Unaudited)

Assets	April 30, 2020
Unaffiliated investments, at value (identified cost, $52,416,116)	$	51,600,036
Affiliated investment, at value (identified cost, $2,208,636)		2,209,289
Cash		8,582
Deposits for derivatives collateral —
Financial futures contracts		6,000
Centrally cleared derivatives		2,515,861
Foreign currency, at value (identified cost, $2,062,362)		2,084,039
Interest receivable		247,758
Dividends receivable from affiliated investment		1,355
Receivable for investments sold		845
Receivable for variation margin on open centrally cleared derivatives		2,926
Receivable for open forward foreign currency exchange contracts		76,443
Receivable for open swap contracts		77,701
Receivable from affiliate		21,920
Total assets	$	58,852,755
Liabilities
Payable for variation margin on open financial futures contracts	$	2,225
Payable for open forward foreign currency exchange contracts		35,573
Payable to affiliates:
Investment adviser fee		24,432
Trustees’ fees		372
Accrued expenses		205,021
Total liabilities	$	267,623
Net Assets applicable to investors’ interest in Portfolio	$	58,585,132

19 See Notes to Financial Statements.

International Income Portfolio

April 30, 2020

Statement of Operations (Unaudited)

Investment Income	Six Months Ended April 30, 2020
Interest (net of foreign taxes, $105,641)	$	1,406,537
Dividends from affiliated investment		15,411
Total investment income	$	1,421,948
Expenses
Investment adviser fee	$	180,614
Trustees’ fees and expenses		2,155
Custodian fee		81,854
Legal and accounting services		39,878
Interest expense		4,120
Miscellaneous		6,353
Total expenses	$	314,974
Deduct —
Allocation of expenses to affiliate	$	57,994
Total expense reductions	$	57,994
Net expenses	$	256,980
Net investment income	$	1,164,968
Realized and Unrealized Gain (Loss)
Net realized gain (loss) —
Investment transactions	$	(187,467	)
Investment transactions — affiliated investment		(253	)
Swap contracts		50,768
Foreign currency transactions		(186,197	)
Forward foreign currency exchange contracts		(434,276	)
Net realized loss	$	(757,425	)
Change in unrealized appreciation (depreciation) —
Investments	$	(1,234,612	)
Investments — affiliated investment		25
Financial futures contracts		(2,156	)
Swap contracts		842,830
Foreign currency		11,114
Forward foreign currency exchange contracts		(345,267	)
Net change in unrealized appreciation (depreciation)	$	(728,066	)
Net realized and unrealized loss	$	(1,485,491	)
Net decrease in net assets from operations	$	(320,523	)

20 See Notes to Financial Statements.

International Income Portfolio

April 30, 2020

Statements of Changes in Net Assets

Increase (Decrease) in Net Assets	Six Months Ended April 30, 2020 (Unaudited)			Year Ended October 31, 2019
From operations —
Net investment income	$	1,164,968		$	3,280,409
Net realized gain (loss)		(757,425	)		187,919
Net change in unrealized appreciation (depreciation)		(728,066	)		1,528,518
Net increase (decrease) in net assets from operations	$	(320,523	)	$	4,996,846
Capital transactions —
Contributions	$	1,125,810		$	8,811,460
Withdrawals		(26,864,427	)		(24,326,854	)
Net decrease in net assets from capital transactions	$	(25,738,617	)	$	(15,515,394	)
Net decrease in net assets	$	(26,059,140	)	$	(10,518,548	)
Net Assets
At beginning of period	$	84,644,272		$	95,162,820
At end of period	$	58,585,132		$	84,644,272

21 See Notes to Financial Statements.

International Income Portfolio

April 30, 2020

Financial Highlights

	Six Months Ended April 30, 2020 (Unaudited)			Year Ended October 31,
Ratios/Supplemental Data				2019			2018			2017			2016			2015
Ratios (as a percentage of average daily net assets):
Expenses(1)		0.71	%(2)(3)(4)		0.81	%(2)(4)		0.81	%(2)(4)		0.80	%(2)		0.81	%(2)(4)		0.81	%(2)(4)
Net investment income		3.23	%(3)		3.73	%		3.81	%		3.02	%		3.17	%		3.56	%
Portfolio Turnover		47	%(5)		92	%		23	%		29	%		38	%		23	%
Total Return		(0.59	)%(2)(5)		5.92	%(2)		(2.28	)%(2)		9.09	%(2)		3.25	%(2)		(5.84	)%(2)
Net assets, end of period (000’s omitted)	$	58,585		$	84,644		$	95,163		$	102,912		$	138,716		$	237,251

⁽¹⁾   Excludes the effect of custody fee credits, if any, of less than 0.005%. Effective September 1, 2015, custody fee credits, which were earned on cash deposit balances, were discontinued by the custodian.

⁽²⁾  The investment adviser reimbursed certain operating expenses (equal to 0.16%, 0.09%, 0.11%, 0.13%, 0.08% and 0.04% of average daily net assets for the six months ended April 30, 2020 and the years ended October 31, 2019, 2018, 2017, 2016 and 2015, respectively). Absent this reimbursement, total return would be lower.

⁽³⁾  Annualized.

⁽⁴⁾  Includes interest expense of 0.01% for the six months ended April 30, 2020 and each of the years ended October 31, 2019, 2018, 2016 and 2015.

⁽⁵⁾  Not annualized.

22 See Notes to Financial Statements.

International Income Portfolio

April 30, 2020

Notes to Financial Statements (Unaudited)

1  Significant Accounting Policies

International Income Portfolio (the Portfolio) is a Massachusetts business trust registered under the Investment Company Act of 1940, as amended (the 1940 Act), as a diversified, open-end management investment company. The Portfolio’s investment objective is total return. The Declaration of Trust permits the Trustees to issue interests in the Portfolio. At April 30, 2020, Eaton Vance Global Bond Fund held a 99.9% interest in the Portfolio.

The following is a summary of significant accounting policies of the Portfolio. The policies are in conformity with accounting principles generally accepted in the United States of America (U.S. GAAP). The Portfolio is an investment company and follows accounting and reporting guidance in the Financial Accounting Standards Board (FASB) Accounting Standards Codification Topic 946.

A  Investment Valuation — The following methodologies are used to determine the market value or fair value of investments.

Debt Obligations. Debt obligations are generally valued on the basis of valuations provided by third party pricing services, as derived from such services’ pricing models. Inputs to the models may include, but are not limited to, reported trades, executable bid and ask prices, broker/dealer quotations, prices or yields of securities with similar characteristics, interest rates, anticipated prepayments, benchmark curves or information pertaining to the issuer, as well as industry and economic events. The pricing services may use a matrix approach, which considers information regarding securities with similar characteristics to determine the valuation for a security. Short-term debt obligations purchased with a remaining maturity of sixty days or less for which a valuation from a third party pricing service is not readily available may be valued at amortized cost, which approximates fair value.

Derivatives. Financial futures contracts are valued at the closing settlement price established by the board of trade or exchange on which they are traded. Forward foreign currency exchange contracts are generally valued at the mean of the average bid and average ask prices that are reported by currency dealers to a third party pricing service at the valuation time. Such third party pricing service valuations are supplied for specific settlement periods and the Portfolio’s forward foreign currency exchange contracts are valued at an interpolated rate between the closest preceding and subsequent settlement period reported by the third party pricing service. Swaps are normally valued using valuations provided by a third party pricing service. Such pricing service valuations are based on the present value of fixed and projected floating rate cash flows over the term of the swap contract. Future cash flows on swaps are discounted to their present value using swap rates provided by electronic data services or by broker/dealers.

Foreign Securities and Currencies. Foreign securities and currencies are valued in U.S. dollars, based on foreign currency exchange rate quotations supplied by a third party pricing service. The pricing service uses a proprietary model to determine the exchange rate. Inputs to the model include reported trades and implied bid/ask spreads.

Affiliated Fund. The Portfolio may invest in Eaton Vance Cash Reserves Fund, LLC (Cash Reserves Fund), an affiliated investment company managed by Eaton Vance Management (EVM). While Cash Reserves Fund is not a registered money market mutual fund, it conducts all of its investment activities in accordance with the requirements of Rule 2a-7 under the 1940 Act. Investments in Cash Reserves Fund are valued at the closing net asset value per unit on the valuation day. Cash Reserves Fund generally values its investment securities based on available market quotations provided by a third party pricing service.

Fair Valuation. Investments for which valuations or market quotations are not readily available or are deemed unreliable are valued at fair value using methods determined in good faith by or at the direction of the Trustees of the Portfolio in a manner that most fairly reflects the security’s “fair value”, which is the amount that the Portfolio might reasonably expect to receive for the security upon its current sale in the ordinary course. Each such determination is based on a consideration of relevant factors, which are likely to vary from one pricing context to another. These factors may include, but are not limited to, the type of security, the existence of any contractual restrictions on the security’s disposition, the price and extent of public trading in similar securities of the issuer or of comparable companies or entities, quotations or relevant information obtained from broker/dealers or other market participants, information obtained from the issuer, analysts, and/or the appropriate stock exchange (for exchange-traded securities), an analysis of the company’s or entity’s financial statements, and an evaluation of the forces that influence the issuer and the market(s) in which the security is purchased and sold.

B  Investment Transactions — Investment transactions for financial statement purposes are accounted for on a trade date basis. Realized gains and losses on investments sold are determined on the basis of identified cost.

C  Income — Interest income is recorded on the basis of interest accrued, adjusted for amortization of premium or accretion of discount. Withholding taxes on foreign interest have been provided for in accordance with the Portfolio’s understanding of the applicable countries’ tax rules and rates. Inflation adjustments to the principal amount of inflation-adjusted bonds and notes are reflected as interest income. Deflation adjustments to the principal amount of an inflation-adjusted bond or note are reflected as reductions to interest income to the extent of interest income previously recorded on such bond or note. Dividend income is recorded on the ex-dividend date for dividends received in cash and/or securities.

D  Federal and Other Taxes — The Portfolio has elected to be treated as a partnership for federal tax purposes. No provision is made by the Portfolio for federal or state taxes on any taxable income of the Portfolio because each investor in the Portfolio is ultimately responsible for the payment of any taxes on its share of taxable income. Since at least one of the Portfolio’s investors is a regulated investment company that invests all or substantially all of its assets in the Portfolio, the Portfolio normally must satisfy the applicable source of income and diversification requirements (under the Internal Revenue Code) in order for its investors to satisfy them. The Portfolio will allocate, at least annually among its investors, each investor’s distributive share of the Portfolio’s net investment income, net realized capital gains and losses and any other items of income, gain, loss, deduction or credit.

In addition to the requirements of the Internal Revenue Code, the Portfolio may also be subject to local taxes on the recognition of capital gains in certain countries. In determining the daily net asset value, the Portfolio estimates the accrual for such taxes, if any, based on the unrealized appreciation on

23

International Income Portfolio

April 30, 2020

Notes to Financial Statements (Unaudited) — continued

certain portfolio securities and the related tax rates. Taxes attributable to unrealized appreciation are included in the change in unrealized appreciation (depreciation) on investments. Capital gains taxes on securities sold are included in net realized gain (loss) on investments.

As of April 30, 2020, the Portfolio had no uncertain tax positions that would require financial statement recognition, de-recognition, or disclosure. The Portfolio files a U.S. federal income tax return annually after its fiscal year-end, which is subject to examination by the Internal Revenue Service for a period of three years from the date of filing.

E  Foreign Currency Translation — Investment valuations, other assets, and liabilities initially expressed in foreign currencies are translated each business day into U.S. dollars based upon current exchange rates. Purchases and sales of foreign investment securities and income and expenses denominated in foreign currencies are translated into U.S. dollars based upon currency exchange rates in effect on the respective dates of such transactions. Recognized gains or losses on investment transactions attributable to changes in foreign currency exchange rates are recorded for financial statement purposes as net realized gains and losses on investments. That portion of unrealized gains and losses on investments that results from fluctuations in foreign currency exchange rates is not separately disclosed.

F  Use of Estimates — The preparation of the financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of income and expense during the reporting period. Actual results could differ from those estimates.

G  Indemnifications — Under the Portfolio’s organizational documents, its officers and Trustees may be indemnified against certain liabilities and expenses arising out of the performance of their duties to the Portfolio. Under Massachusetts law, if certain conditions prevail, interestholders in the Portfolio could be deemed to have personal liability for the obligations of the Portfolio. However, the Portfolio’s Declaration of Trust contains an express disclaimer of liability on the part of Portfolio interestholders. Additionally, in the normal course of business, the Portfolio enters into agreements with service providers that may contain 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 occurred.

H  Financial Futures Contracts — Upon entering into a financial futures contract, the Portfolio is required to deposit with the broker, either in cash or securities, an amount equal to a certain percentage of the contract amount (initial margin). Subsequent payments, known as variation margin, are made or received by the Portfolio each business day, depending on the daily fluctuations in the value of the underlying security, and are recorded as unrealized gains or losses by the Portfolio. Gains (losses) are realized upon the expiration or closing of the financial futures contracts. Should market conditions change unexpectedly, the Portfolio may not achieve the anticipated benefits of the financial futures contracts and may realize a loss. Futures contracts have minimal counterparty risk as they are exchange traded and the clearinghouse for the exchange is substituted as the counterparty, guaranteeing counterparty performance.

I  Forward Foreign Currency Exchange Contracts — The Portfolio may enter into forward foreign currency exchange contracts for the purchase or sale of a specific foreign currency at a fixed price on a future date. The forward foreign currency exchange contracts are adjusted by the daily exchange rate of the underlying currency and any gains or losses are recorded as unrealized until such time as the contracts have been closed. While forward foreign currency exchange contracts are privately negotiated agreements between the Portfolio and a counterparty, certain contracts may be “centrally cleared”, whereby all payments made or received by the Portfolio pursuant to the contract are with a central clearing party (CCP) rather than the original counterparty. The CCP guarantees the performance of the original parties to the contract. Upon entering into centrally cleared contracts, the Portfolio is required to deposit with the CCP, either in cash or securities, an amount of initial margin determined by the CCP, which is subject to adjustment. For centrally cleared contracts, the daily change in valuation is recorded as a receivable or payable for variation margin and settled in cash with the CCP daily. Risks may arise upon entering these contracts from the potential inability of counterparties to meet the terms of their contracts and from movements in the value of a foreign currency relative to the U.S. dollar. In the case of centrally cleared contracts, counterparty risk is minimal due to protections provided by the CCP.

J  Interest Rate Swaps — Swap contracts are privately negotiated agreements between the Portfolio and a counterparty. Certain swap contracts may be centrally cleared. Pursuant to interest rate swap agreements, the Portfolio either makes floating-rate payments to the counterparty (or CCP in the case of centrally cleared swaps) based on a benchmark interest rate in exchange for fixed-rate payments or the Portfolio makes fixed-rate payments to the counterparty (or CCP in the case of a centrally cleared swap) in exchange for payments on a floating benchmark interest rate. Payments received or made, including amortization of upfront payments/receipts, are recorded as realized gains or losses. During the term of the outstanding swap agreement, changes in the underlying value of the swap are recorded as unrealized gains or losses. For centrally cleared swaps, the daily change in valuation is recorded as a receivable or payable for variation margin and settled in cash with the CCP daily. The value of the swap is determined by changes in the relationship between two rates of interest. The Portfolio is exposed to credit loss in the event of non-performance by the swap counterparty. In the case of centrally cleared swaps, counterparty risk is minimal due to protections provided by the CCP. Risk may also arise from movements in interest rates.

K  Interim Financial Statements — The interim financial statements relating to April 30, 2020 and for the six months then ended have not been audited by an independent registered public accounting firm, but in the opinion of the Portfolio’s management, reflect all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of the financial statements.

24

International Income Portfolio

April 30, 2020

Notes to Financial Statements (Unaudited) — continued

2  Investment Adviser Fee and Other Transactions with Affiliates

The investment adviser fee is earned by Boston Management and Research (BMR), a subsidiary of EVM, as compensation for investment advisory services rendered to the Portfolio. Pursuant to the investment advisory agreement and subsequent fee reduction agreement between the Portfolio and BMR, the fee is computed at an annual rate of 0.500% of the Portfolio’s average daily net assets up to $1 billion, 0.475% from $1 billion but less than $2.5 billion and at reduced rates on daily net assets of $2.5 billion or more, and is payable monthly. The fee reduction cannot be terminated or reduced without the approval of a majority vote of the Trustees of the Portfolio who are not interested persons of BMR or the Portfolio and by the vote of a majority of the holders of interest in the Portfolio. For the six months ended April 30, 2020, the Portfolio’s investment adviser fee amounted to $180,614 or 0.500% (annualized) of the Portfolio’s average daily net assets. Pursuant to a voluntary expense reimbursement, BMR was allocated $57,994 of the Portfolio’s operating expenses for the six months ended April 30, 2020. The Portfolio invests its cash in Cash Reserves Fund. EVM does not currently receive a fee for advisory services provided to Cash Reserves Fund.

Trustees and officers of the Portfolio who are members of EVM’s or BMR’s organizations receive remuneration for their services to the Portfolio out of the investment adviser fee. Trustees of the Portfolio who are not affiliated with the investment adviser may elect to defer receipt of all or a percentage of their annual fees in accordance with the terms of the Trustees Deferred Compensation Plan. For the six months ended April 30, 2020, no significant amounts have been deferred. Certain officers and Trustees of the Portfolio are officers of the above organizations.

3  Purchases and Sales of Investments

Purchases and sales of investments, other than short-term obligations and including maturities and paydowns, for the six months ended April 30, 2020 were as follows:

	Purchases		Sales
Investments (non-U.S. Government)	$	9,314,792	$	12,109,340
U.S. Government and Agency Securities		—		28,062
	$	9,314,792	$	12,137,402

4  Federal Income Tax Basis of Investments

The cost and unrealized appreciation (depreciation) of investments, including open derivative contracts, of the Portfolio at April 30, 2020, as determined on a federal income tax basis, were as follows:

Aggregate cost	$	55,074,541
Gross unrealized appreciation	$	481,796
Gross unrealized depreciation		(1,006,888	)
Net unrealized depreciation	$	(525,092	)

5  Financial Instruments

The Portfolio may trade in financial instruments with off-balance sheet risk in the normal course of its investing activities. These financial instruments may include forward foreign currency exchange contracts, futures contracts and swap contracts and may involve, to a varying degree, elements of risk in excess of the amounts recognized for financial statement purposes. The notional or contractual amounts of these instruments represent the investment the Portfolio has in particular classes of financial instruments and do not necessarily represent the amounts potentially subject to risk. The measurement of the risks associated with these instruments is meaningful only when all related and offsetting transactions are considered. A summary of obligations under these financial instruments at April 30, 2020 is included in the Portfolio of Investments. At April 30, 2020, the Portfolio had sufficient cash and/or securities to cover commitments under these contracts.

In the normal course of pursuing its investment objective, the Portfolio is subject to the following risks:

Foreign Exchange Risk: The Portfolio engages in forward foreign currency exchange contracts to enhance total return, to seek to hedge against fluctuations in currency exchange rates and/or as a substitute for the purchase or sale of securities or currencies.

25

International Income Portfolio

April 30, 2020

Notes to Financial Statements (Unaudited) — continued

Interest Rate Risk: The Portfolio utilizes futures contracts and interest rate swaps to enhance total return, to seek to hedge against fluctuations in interest rates, and/or to change the effective duration of its portfolio.

The Portfolio enters into over-the-counter (OTC) derivatives that may contain provisions whereby the counterparty may terminate the contract under certain conditions, including but not limited to a decline in the Portfolio’s net assets below a certain level over a certain period of time, which would trigger a payment by the Portfolio for those derivatives in a liability position. At April 30, 2020, the fair value of derivatives with credit-related contingent features in a net liability position was $35,573. At April 30, 2020, there were no assets pledged by the Portfolio for such liability.

The OTC derivatives in which the Portfolio invests are subject to the risk that the counterparty to the contract fails to perform its obligations under the contract. To mitigate this risk, the Portfolio has entered into an International Swaps and Derivatives Association, Inc. Master Agreement (“ISDA Master Agreement”) or similar agreement with substantially all its derivative counterparties. An ISDA Master Agreement is a bilateral agreement between the Portfolio and a counterparty that governs certain OTC derivatives and typically contains, among other things, set-off provisions in the event of a default and/or termination event as defined under the relevant ISDA Master Agreement. Under an ISDA Master Agreement, the Portfolio may, under certain circumstances, offset with the counterparty certain derivative financial instruments’ payables and/or receivables with collateral held and/or posted and create one single net payment. The provisions of the ISDA Master Agreement typically permit a single net payment in the event of default including the bankruptcy or insolvency of the counterparty. However, bankruptcy or insolvency laws of a particular jurisdiction may impose restrictions on or prohibitions against the right of offset in bankruptcy or insolvency. Certain ISDA Master Agreements allow counterparties to OTC derivatives to terminate derivative contracts prior to maturity in the event the Portfolio’s net assets decline by a stated percentage or the Portfolio fails to meet the terms of its ISDA Master Agreements, which would cause the counterparty to accelerate payment by the Portfolio of any net liability owed to it.

The collateral requirements for derivatives traded under an ISDA Master Agreement are governed by a Credit Support Annex to the ISDA Master Agreement. Collateral requirements are determined at the close of business each day and are typically based on changes in market values for each transaction under an ISDA Master Agreement and netted into one amount for such agreement. Generally, the amount of collateral due from or to a counterparty is subject to a minimum transfer threshold amount before a transfer is required, which may vary by counterparty. Collateral pledged for the benefit of the Portfolio and/or counterparty is held in segregated accounts by the Portfolio’s custodian and cannot be sold, re-pledged, assigned or otherwise used while pledged. The portion of such collateral representing cash, if any, is reflected as deposits for derivatives collateral and, in the case of cash pledged by a counterparty for the benefit of the Portfolio, a corresponding liability on the Statement of Assets and Liabilities. Securities pledged by the Portfolio as collateral, if any, are identified as such in the Portfolio of Investments.

The fair value of open derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) by risk exposure at April 30, 2020 was as follows:

	Fair Value
Statement of Assets and Liabilities Caption	Foreign Exchange			Interest Rate			Total
Not applicable	$	779,446	*	$	663,180	*	$	1,442,626
Receivable for open forward foreign currency exchange contracts		76,443			—			76,443
Receivable for open swap contracts		—			77,701			77,701
Total Asset Derivatives	$	855,889		$	740,881		$	1,596,770
Derivatives not subject to master netting or similar agreements	$	779,446		$	663,180		$	1,442,626
Total Asset Derivatives subject to master netting or similar agreements	$	76,443		$	77,701		$	154,144
Not applicable	$	(818,917	)*	$	(2,156	)*	$	(821,073	)
Payable for open forward foreign currency exchange contracts		(35,573	)		—			(35,573	)
Total Liability Derivatives	$	(854,490	)	$	(2,156	)	$	(856,646	)
Derivatives not subject to master netting or similar agreements	$	(818,917	)	$	(2,156	)	$	(821,073	)
Total Liability Derivatives subject to master netting or similar agreements	$	(35,573	)	$	—		$	(35,573	)

* For futures contracts and centrally cleared derivatives, amount represents value as shown in the Portfolio of Investments. Only the current day’s variation margin on open futures contracts and centrally cleared derivatives are reported within the Statement of Assets and Liabilities as Receivable or Payable for variation margin on open financial futures contracts and centrally cleared derivatives, as applicable.

26

International Income Portfolio

April 30, 2020

Notes to Financial Statements (Unaudited) — continued

The Portfolio’s derivative assets and liabilities at fair value by risk, which are reported gross in the Statement of Assets and Liabilities, are presented in the table above. The following tables present the Portfolio’s derivative assets and liabilities by counterparty, net of amounts available for offset under a master netting agreement and net of the related collateral received by the Portfolio for such assets and pledged by the Portfolio for such liabilities as of

April 30, 2020.

Counterparty	Derivative Assets Subject to Master Netting Agreement			Derivatives Available for Offset			Non-cash Collateral Received(a)		Cash Collateral Received(a)		Net Amount of Derivative Assets(b)
Bank of America, N.A.	$	687		$	—		$	—	$	—	$	687
Citibank, N.A.		90,513			—			—		—		90,513
Goldman Sachs International		11,922			—			—		—		11,922
Standard Chartered Bank		41,408			(13,246	)		—		—		28,162
UBS AG		9,614			(9,614	)		—		—		—
	$	154,144		$	(22,860	)	$	—	$	—	$	131,284
Counterparty	Derivative Liabilities Subject to Master Netting Agreement			Derivatives Available for Offset			Non-cash Collateral Pledged(a)		Cash Collateral Pledged(a)		Net Amount of Derivative Liabilities(c)
BNP Paribas	$	(12,681	)	$	—		$	—	$	—	$	(12,681	)
Standard Chartered Bank		(13,246	)		13,246			—		—		—
UBS AG		(9,646	)		9,614			—		—		(32	)
	$	(35,573	)	$	22,860		$	—	$	—	$	(12,713	)

^(a)  In some instances, the total collateral received and/or pledged may be more than the amount shown due to overcollateralization.

^(b)  Net amount represents the net amount due from the counterparty in the event of default.

^(c)  Net amount represents the net amount payable to the counterparty in the event of default.

The effect of derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) on the Statement of Operations by risk exposure for the six months ended April 30, 2020 was as follows:

Statement of Operations Caption	Foreign Exchange			Interest Rate			Total
Net realized gain (loss) —
Swap contracts	$	—		$	50,768		$	50,768
Forward foreign currency exchange contracts		(434,276	)		—			(434,276	)
Total	$	(434,276	)	$	50,768		$	(383,508	)
Change in unrealized appreciation (depreciation) —
Financial futures contracts	$	—		$	(2,156	)	$	(2,156	)
Swap contracts					842,830			842,830
Forward foreign currency exchange contracts		(345,267	)		—			(345,267	)
Total	$	(345,267	)	$	840,674		$	495,407

27

International Income Portfolio

April 30, 2020

Notes to Financial Statements (Unaudited) — continued

The average notional cost of futures contracts and average notional amounts of other derivative contracts outstanding during the six months ended April 30, 2020, which are indicative of the volume of these derivative types, were approximately as follows:

Futures Contracts — Short		Forward Foreign Currency Exchange Contracts*		Swap Contracts
	$59,000	$	99,066,000	$	15,347,000

* The average notional amount for forward foreign currency exchange contracts is based on the absolute value of notional amounts of currency purchased and currency sold.

6  Line of Credit

The Portfolio participates with other portfolios and funds managed by EVM and its affiliates in an $800 million unsecured line of credit agreement with a group of banks, which is in effect through October 27, 2020. In connection with the renewal of the agreement on October 29, 2019, funds managed by Calvert Research and Management, an affiliate of EVM, were added as participating funds to the agreement and the borrowing limit was increased from $625 million. Borrowings are made by the Portfolio solely for temporary purposes related to redemptions and other short-term cash needs. Interest is charged to the Portfolio based on its borrowings at an amount above either the Eurodollar rate or Federal Funds rate. In addition, a fee computed at an annual rate of 0.15% on the daily unused portion of the line of credit is allocated among the participating portfolios and funds at the end of each quarter. Because the line of credit is not available exclusively to the Portfolio, it may be unable to borrow some or all of its requested amounts at any particular time. The Portfolio did not have any significant borrowings or allocated fees during the six months ended April 30, 2020.

7  Investments in Affiliated Funds

At April 30, 2020, the value of the Portfolio’s investment in affiliated funds was $2,209,289, which represents 3.8% of the Portfolio’s net assets. Transactions in affiliated funds by the Portfolio for the six months ended April 30, 2020 were as follows:

Name of affiliated fund	Value, beginning of period		Purchases		Sales proceeds			Net realized gain (loss)			Change in unrealized appreciation (depreciation)		Value, end of period		Dividend income		Units, end of period
Short-Term Investments
Eaton Vance Cash Reserves Fund, LLC	$	6,491,338	$	25,323,755	$	(29,605,576	)	$	(253	)	$	25	$	2,209,289	$	15,411		2,209,289

8  Fair Value Measurements

Under generally accepted accounting principles for fair value measurements, a three-tier hierarchy to prioritize the assumptions, referred to as inputs, is used in valuation techniques to measure fair value. The three-tier hierarchy of inputs is summarized in the three broad levels listed below.

• Level 1 – quoted prices in active markets for identical investments

• Level 2 – other significant observable inputs (including quoted prices for similar investments, interest rates, prepayment speeds, credit risk, etc.)

• Level 3 – significant unobservable inputs (including a fund’s own assumptions in determining the fair value of investments)

In cases where the inputs used to measure fair value fall in different levels of the fair value hierarchy, the level disclosed is determined based on the lowest level input that is significant to the fair value measurement in its entirety. The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities.

28

International Income Portfolio

April 30, 2020

Notes to Financial Statements (Unaudited) — continued

At April 30, 2020, the hierarchy of inputs used in valuing the Portfolio’s investments and open derivative instruments, which are carried at value, were as follows:

Asset Description	Level 1			Level 2			Level 3		Total
Foreign Government Bonds	$	—		$	13,780,877		$	—	$	13,780,877
Foreign Corporate Bonds		—			1,970,586			—		1,970,586
Mortgage Pass-Throughs		—			275,039			—		275,039
Short-Term Investments —
Foreign Government Securities		—			4,576,459			—		4,576,459
U.S. Treasury Obligations		—			30,997,075			—		30,997,075
Other		—			2,209,289			—		2,209,289
Total Investments	$	—		$	53,809,325		$	—	$	53,809,325
Forward Foreign Currency Exchange Contracts	$	—		$	855,889		$	—	$	855,889
Swap Contracts		—			740,881			—		740,881
Total	$	—		$	55,406,095		$	—	$	55,406,095
Liability Description
Forward Foreign Currency Exchange Contracts	$	—		$	(854,490	)	$	—	$	(854,490	)
Futures Contracts		(2,156	)		—			—		(2,156	)
Total	$	(2,156	)	$	(854,490	)	$	—	$	(856,646	)

9  Risks and Uncertainties

Risks Associated with Foreign Investments

The Portfolio’s investments in foreign instruments can be adversely affected by changes in currency exchange rates and political, economic and market developments abroad. In emerging or less developed countries, these risks can be more significant. Investment markets in emerging market countries are typically substantially smaller, less liquid and more volatile than the major markets in developed countries. Emerging market countries may have relatively unstable governments and economies. Emerging market investments often are subject to speculative trading, which typically contributes to volatility.

The Portfolio may have difficulties enforcing its legal or contractual rights in a foreign country. Economic data as reported by foreign governments and other issuers may be delayed, inaccurate or fraudulent. In the event of a default by a sovereign entity, there are typically no assets to be seized or cash flows to be attached. Furthermore, the willingness or ability of a foreign government to renegotiate defaulted debt may be limited.

Pandemic Risk

An outbreak of respiratory disease caused by a novel coronavirus that was first detected in China in December 2019 has spread rapidly internationally. This coronavirus has resulted in closing borders, enhanced health screenings, changes to healthcare service preparation and delivery, quarantines, cancellations, disruptions to supply chains and customer activity, as well as general concern and uncertainty. The impact of this outbreak has negatively affected the worldwide economy, as well as the economies of individual countries and individual companies and can affect the market in general in significant and unforeseen ways. Health crises caused by outbreaks, such as the coronavirus outbreak, may exacerbate other pre-existing political, social and economic risks and disrupt normal market conditions and operations. The near-term impact of this coronavirus has resulted in substantial market volatility, which may have an adverse effect on the Portfolio’s investments.

29

Eaton Vance

Global Bond Fund

April 30, 2020

Board of Trustees’ Contract Approval

Overview of the Contract Review Process

The Investment Company Act of 1940, as amended (the “1940 Act”), provides, in substance, that the investment advisory agreement between a fund and its investment adviser will continue in effect from year-to-year only if its continuation is approved on an annual basis by a vote of the fund’s board of trustees, including a majority of the trustees who are not “interested persons” of the fund (“independent trustees”), cast in person at a meeting called for the purpose of considering such approval.

At a meeting held on April 22, 2020 (the “April 2020 Meeting”), the Boards of Trustees/Directors comprised of the same individuals (collectively, the “Board”) that oversees a majority of the registered investment companies advised by Eaton Vance Management or its affiliate, Boston Management and Research (the “Eaton Vance Funds”), including a majority of the independent trustees (the “Independent Trustees”), voted to approve the continuation of existing investment advisory agreements and sub-advisory agreements¹ for each of the Eaton Vance Funds for an additional one-year period. The Board relied upon the affirmative recommendation of its Contract Review Committee, which is a committee exclusively comprised of Independent Trustees. Prior to making its recommendation, the Contract Review Committee reviewed information furnished by the adviser and sub-adviser to each of the Eaton Vance Funds (including information specifically requested by the Board) for a series of formal meetings held between February and April 2020. Members of the Contract Review Committee also considered information received at prior meetings of the Board and its committees, to the extent such information was relevant to the Contract Review Committee’s annual evaluation of the investment advisory agreements and sub-advisory agreements.

In connection with its evaluation of the investment advisory agreements and sub-advisory agreements, the Board considered various information relating to the Eaton Vance Funds. This included information applicable to all or groups of Eaton Vance Funds, which is referenced immediately below, and information applicable to the particular Eaton Vance Fund covered by this report (additional fund-specific information is referenced below under “Results of the Contract Review Process”). (For funds that invest through one or more underlying portfolios, references to “each fund” in this section may include information that was considered at the portfolio-level.)

Information about Fees, Performance and Expenses

• A report from an independent data provider comparing advisory and other fees paid by each fund to such fees paid by comparable funds, as identified by the independent data provider (“comparable funds”);

• A report from an independent data provider comparing each fund’s total expense ratio (and its components) to those of comparable funds;

• A report from an independent data provider comparing the investment performance of each fund (including, as relevant, total return data, income data, Sharpe ratios and information ratios) to the investment performance of comparable funds and, as applicable, benchmark indices, over various time periods;

• In certain instances, data regarding investment performance relative to customized groups of peer funds and blended indices identified by the adviser in consultation with the Portfolio Management Committee of the Board;

• Comparative information concerning the fees charged and services provided by the adviser and sub-adviser to each fund in managing other accounts (which may include other mutual funds, collective investment funds and institutional accounts) using investment strategies and techniques similar to those used in managing such fund(s), if any;

• Profitability analyses with respect to the adviser and sub-adviser to each of the funds;

Information about Portfolio Management and Trading

• Descriptions of the investment management services provided to each fund, as well as each of the funds’ investment strategies and policies;

• The procedures and processes used to determine the fair value of fund assets, when necessary, and actions taken to monitor and test the effectiveness of such procedures and processes;

• Information about the policies and practices of each fund’s adviser and sub-adviser (in the context of a sub-adviser, only those with trading responsibilities) with respect to trading, including their processes for seeking best execution of portfolio transactions;

• Information about the allocation of brokerage transactions and the benefits, if any, received by the adviser and sub-adviser (in the context of a sub-adviser, only those with trading responsibilities) to each fund as a result of brokerage allocation, including, as applicable, information concerning the acquisition of research through client commission arrangements and policies with respect to “soft dollars”;

• Data relating to the portfolio turnover rate of each fund;

Information about each Adviser and Sub-adviser

• Reports detailing the financial results and condition of the adviser and sub-adviser to each fund;

• Information regarding the individual investment professionals whose responsibilities include portfolio management and investment research for the funds, and, for portfolio managers and certain other investment professionals, information relating to their responsibilities with respect to managing other mutual funds and investment accounts, as applicable;

¹  Not all Eaton Vance Funds have entered into a sub-advisory agreement with a sub-adviser. Accordingly, references to “sub-adviser” or “sub-advisory agreement” in this “Overview” section may not be applicable to the particular Eaton Vance Fund covered by this report.

30

Eaton Vance

Global Bond Fund

April 30, 2020

Board of Trustees’ Contract Approval — continued

• The Code of Ethics of the adviser and its affiliates and the sub-adviser of each fund, together with information relating to compliance with, and the administration of, such codes;

• Policies and procedures relating to proxy voting and the handling of corporate actions and class actions;

• Information concerning the resources devoted to compliance efforts undertaken by the adviser and its affiliates and the sub-adviser of each fund, if any, including descriptions of their various compliance programs and their record of compliance;

• Information concerning the business continuity and disaster recovery plans of the adviser and its affiliates and the sub-adviser of each fund, if any;

• A description of Eaton Vance Management’s and Boston Management and Research’s oversight of sub-advisers, including with respect to regulatory and compliance issues, investment management and other matters;

Other Relevant Information

• Information concerning the nature, cost and character of the administrative and other non-investment advisory services provided by Eaton Vance Management and its affiliates;

• Information concerning oversight of the relationship with the custodian, subcustodians and fund accountants by the adviser and/or administrator to each of the funds;

• For an Eaton Vance Fund structured as an exchange-listed closed-end fund, information concerning the benefits of the closed-end fund structure, as well as, where relevant, the closed-end fund’s market prices, trading volume data, distribution rates and other relevant matters; and

• The terms of each investment advisory agreement and sub-advisory agreement.

During the various meetings of the Board and its committees throughout the twelve months ended April 2020, the Trustees received information from portfolio managers and other investment professionals of the advisers and sub-advisers of the funds regarding investment and performance matters, and considered various investment and trading strategies used in pursuing the funds’ investment objectives. The Trustees also received information regarding risk management techniques employed in connection with the management of the funds. The Board and its committees evaluated issues pertaining to industry and regulatory developments, compliance procedures, fund governance and other issues with respect to the funds, and received and participated in reports and presentations provided by Eaton Vance Management, Boston Management and Research and fund sub-advisers, with respect to such matters. In addition to the formal meetings of the Board and its committees, the Independent Trustees held regular teleconferences to discuss, among other topics, matters relating to the continuation of investment advisory agreements and sub-advisory agreements.

The Contract Review Committee was advised throughout the contract review process by Goodwin Procter LLP, independent legal counsel for the Independent Trustees. The members of the Contract Review Committee, with the advice of such counsel, exercised their own business judgment in determining the material factors to be considered in evaluating each investment advisory agreement and sub-advisory agreement and the weight to be given to each such factor. The conclusions reached with respect to each investment advisory agreement and sub-advisory agreement were based on a comprehensive evaluation of all the information provided and not any single factor. Moreover, each member of the Contract Review Committee may have placed varying emphasis on particular factors in reaching conclusions with respect to each investment advisory agreement and sub-advisory agreement. In evaluating each investment advisory agreement and sub-advisory agreement, including the fee structures and other terms contained in such agreements, the members of the Contract Review Committee were also informed by multiple years of analysis and discussion with the adviser and sub-adviser to each of the Eaton Vance Funds.

In voting its approval of the continuation of existing investment advisory agreements and sub-advisory agreements at the April 2020 Meeting, the Board relied on an order issued by the Securities and Exchange Commission on March 25, 2020, which provided temporary relief from the in-person voting requirements under Section 15 of the 1940 Act in response to the impacts of the COVID-19 pandemic.

Results of the Contract Review Process

Based on its consideration of the foregoing, and such other information it deemed relevant, including the factors and conclusions described below, the Contract Review Committee concluded that the continuation of the investment advisory agreement between Eaton Vance Global Bond Fund (formerly Eaton Vance Diversified Currency Income Fund) (the “Fund”) and Eaton Vance Management (“EVM”), as well as the investment advisory agreement between International Income Portfolio (the “Portfolio”), the portfolio in which the Fund invests, and Boston Management and Research (“BMR”) (EVM, with respect to the Fund, and BMR, with respect to the Portfolio, are each referred to herein as the “Adviser”), including their respective fee structures, are in the interests of shareholders and, therefore, recommended to the Board approval of each agreement. Based on the recommendation of the Contract Review Committee, the Board, including a majority of the Independent Trustees, voted to approve continuation of the investment advisory agreements for the Fund and the Portfolio.

Nature, Extent and Quality of Services

In considering whether to approve the investment advisory agreements for the Fund and the Portfolio, the Board evaluated the nature, extent and quality of services provided to the Fund and the Portfolio by the applicable Adviser.

31

Eaton Vance

Global Bond Fund

April 30, 2020

Board of Trustees’ Contract Approval — continued

The Board considered each Adviser’s management capabilities and investment processes in light of the types of investments held by the Fund and the Portfolio, including the education, experience and number of investment professionals and other personnel who provide portfolio management, investment research, and similar services to the Fund and the Portfolio, including recent changes to such personnel. The Board considered the abilities and experience of each Adviser’s investment professionals in analyzing factors relevant to investment in a broad range of income securities. The Board also considered each Adviser’s expertise with respect to global markets and in-house research capabilities. The Board also took into account the resources dedicated to portfolio management and other services, the compensation methods of each Adviser and other factors, including the reputation and resources of the Adviser to recruit and retain highly qualified research, advisory and supervisory investment professionals. In addition, the Board considered the time and attention devoted to the Eaton Vance Funds, including the Fund and the Portfolio, by senior management, as well as the infrastructure, operational capabilities and support staff in place to assist in the portfolio management and operations of the Fund and the Portfolio, including the provision of administrative services. The Board also considered the business-related and other risks to which each Adviser or its affiliates may be subject in managing the Fund and the Portfolio.

The Board noted that under the terms of the investment advisory agreement of the Fund, EVM may invest assets of the Fund directly in securities, for which it would receive a fee, or in the Portfolio, for which it receives no separate fee but for which BMR receives an advisory fee from the Portfolio.

The Board considered the compliance programs of each Adviser and relevant affiliates thereof. The Board considered compliance and reporting matters regarding, among other things, personal trading by investment professionals, disclosure of portfolio holdings, late trading, frequent trading, portfolio valuation, business continuity and the allocation of investment opportunities. The Board also considered the responses of each Adviser and its affiliates to requests in recent years from regulatory authorities, such as the Securities and Exchange Commission and the Financial Industry Regulatory Authority.

The Board considered other administrative services provided or overseen by Eaton Vance Management and its affiliates, including transfer agency and accounting services. The Board evaluated the benefits to shareholders of investing in a fund that is a part of a large fund complex offering exposure to a variety of asset classes and investment disciplines, as well as the ability, in many cases, to exchange an investment among different funds without incurring additional sales charges.

After consideration of the foregoing factors, among others, the Board concluded that the nature, extent and quality of services provided by each Adviser, taken as a whole, are appropriate and consistent with the terms of the applicable investment advisory agreement.

Fund Performance

The Board noted that, effective October 16, 2019, the Fund changed its name and investment strategies to allow the Fund, under normal market conditions, to invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in bonds. The Board also noted that the Fund normally invests at least 40% of its net assets in foreign investments. Although the Board considered information comparing the Fund’s investment performance to that of comparable funds identified by an independent data provider (the peer group), as well as appropriate benchmark indices and a custom peer group of similarly managed funds, the Board determined, in light of the recent changes to the Fund, to continue to monitor and evaluate the effectiveness of such changes over time.

Management Fees and Expenses

The Board considered contractual fee rates payable by the Portfolio and by the Fund for advisory and administrative services (referred to collectively as “management fees”). As part of its review, the Board considered the Fund’s management fees and total expense ratio for the one-year period ended September 30, 2019, as compared to those of comparable funds, before and after giving effect to any undertaking to waive fees or reimburse expenses. The Board also considered factors that had an impact on the Fund’s total expense ratio relative to comparable funds.

After considering the foregoing information, and in light of the nature, extent and quality of the services provided by each Adviser, the Board concluded that the management fees charged for advisory and related services are reasonable.

Profitability and “Fall-Out” Benefits

The Board considered the level of profits realized by each Adviser and relevant affiliates thereof in providing investment advisory and administrative services to the Fund, to the Portfolio and to all Eaton Vance Funds as a group. The Board considered the level of profits realized without regard to marketing support or other payments by each Adviser and its affiliates to third parties in respect of distribution or other services.

The Board concluded that, in light of the foregoing factors and the nature, extent and quality of the services rendered, the profits realized by each Adviser and its affiliates are deemed not to be excessive.

The Board also considered direct or indirect fall-out benefits received by each Adviser and its affiliates in connection with their respective relationships with the Fund and the Portfolio, including the benefits of research services that may be available to each Adviser as a result of securities transactions effected for the Fund and the Portfolio and other investment advisory clients.

32

Eaton Vance

Global Bond Fund

April 30, 2020

Board of Trustees’ Contract Approval — continued

Economies of Scale

In reviewing management fees and profitability, the Board also considered the extent to which the applicable Adviser and its affiliates, on the one hand, and the Fund and the Portfolio, on the other hand, can expect to realize benefits from economies of scale as the assets of the Fund and the Portfolio increase. The Board acknowledged the difficulty in accurately measuring the benefits resulting from economies of scale, if any, with respect to the management of any specific fund or group of funds. The Board reviewed data summarizing the increases and decreases in the assets of the Fund and of all Eaton Vance Funds as a group over various time periods, and evaluated the extent to which the total expense ratio of the Fund and the profitability of each Adviser and its affiliates may have been affected by such increases or decreases. Based upon the foregoing, the Board concluded that the Fund currently shares in the benefits from economies of scale, if any, when they are realized by the Adviser. The Board also concluded that the structure of the advisory fees, which include breakpoints at several asset levels, will allow the Fund and the Portfolio to continue to benefit from any economies of scale in the future.

33

Eaton Vance

Global Bond Fund

April 30, 2020

Officers and Trustees

Officers of Eaton Vance Global Bond Fund

Payson F. Swaffield

President

Maureen A. Gemma

Vice President, Secretary and

Chief Legal Officer

James F. Kirchner

Treasurer

Richard F. Froio

Chief Compliance Officer

Officers of International Income Portfolio

Payson F. Swaffield

President

Maureen A. Gemma

Vice President, Secretary and

Chief Legal Officer

James F. Kirchner

Treasurer

Richard F. Froio

Chief Compliance Officer

Trustees of Eaton Vance Global Bond Fund and International Income Portfolio

William H. Park

Chairperson

Thomas E. Faust Jr.*

Mark R. Fetting

Cynthia E. Frost

George J. Gorman

Valerie A. Mosley

Helen Frame Peters

Keith Quinton

Marcus L. Smith

Susan J. Sutherland

Scott E. Wennerholm

* Interested Trustee

34

Eaton Vance Funds

IMPORTANT NOTICES

Privacy.  The Eaton Vance organization is committed to ensuring your financial privacy. Each entity listed below has adopted a privacy policy and procedures (“Privacy Program”) Eaton Vance believes is reasonably designed to protect your personal information and to govern when and with whom Eaton Vance may share your personal information.

• At the time of opening an account, Eaton Vance generally requires you to provide us with certain information such as name, address, social security number, tax status, account numbers, and account balances. This information is necessary for us to both open an account for you and to allow us to satisfy legal requirements such as applicable anti-money laundering reviews and know-your-customer requirements.

• On an ongoing basis, in the normal course of servicing your account, Eaton Vance may share your information with unaffiliated third parties that perform various services for Eaton Vance and/or your account. These third parties include transfer agents, custodians, broker/dealers and our professional advisers, including auditors, accountants, and legal counsel. Eaton Vance may additionally share your personal information with our affiliates.

• We believe our Privacy Program is reasonably designed to protect the confidentiality of your personal information and to prevent unauthorized access to that information.

• We reserve the right to change our Privacy Program at any time upon proper notification to you. You may want to review our Privacy Program periodically for changes by accessing the link on our homepage: www.eatonvance.com.

Our pledge of protecting your personal information applies to the following entities within the Eaton Vance organization: the Eaton Vance Family of Funds, Eaton Vance Management, Eaton Vance Investment Counsel, Eaton Vance Distributors, Inc., Eaton Vance Trust Company, Eaton Vance Management (International) Limited, Eaton Vance Advisers International Limited, Eaton Vance Global Advisors Limited, Eaton Vance Management’s Real Estate Investment Group, Boston Management and Research, Calvert Research and Management, and Calvert Funds. This Privacy Notice supersedes all previously issued privacy disclosures. For more information about our Privacy Program or about how your personal information may be used, please call 1-800-262-1122.

Delivery of Shareholder Documents.  The Securities and Exchange Commission (SEC) permits funds to deliver only one copy of shareholder documents, including prospectuses, proxy statements and shareholder reports, to fund investors with multiple accounts at the same residential or post office box address. This practice is often called “householding” and it helps eliminate duplicate mailings to shareholders. Eaton Vance, or your financial intermediary, may household the mailing of your documents indefinitely unless you instruct Eaton Vance, or your financial intermediary, otherwise. If you would prefer that your Eaton Vance documents not be householded, please contact Eaton Vance at 1-800-262-1122, or contact your financial intermediary. Your instructions that householding not apply to delivery of your Eaton Vance documents will typically be effective within 30 days of receipt by Eaton Vance or your financial intermediary.

Portfolio Holdings.  Each Eaton Vance Fund and its underlying Portfolio(s) (if applicable) files a schedule of portfolio holdings on Part F to Form N-PORT with the SEC for the first and third quarters of each fiscal year. The Form N-PORT will be available on the Eaton Vance website at www.eatonvance.com, by calling Eaton Vance at 1-800-262-1122 or in the EDGAR database on the SEC’s website at www.sec.gov.

Proxy Voting.  From time to time, funds are required to vote proxies related to the securities held by the funds. The Eaton Vance Funds or their underlying Portfolios (if applicable) vote proxies according to a set of policies and procedures approved by the Funds’ and Portfolios’ Boards. You may obtain a description of these policies and procedures and information on how the Funds or Portfolios voted proxies relating to portfolio securities during the most recent 12-month period ended June 30, without charge, upon request, by calling 1-800-262-1122 and by accessing the SEC’s website at www.sec.gov.

35

This Page Intentionally Left Blank

Investment Adviser of International Income Portfolio

Boston Management and Research

Two International Place

Boston, MA 02110

Investment Adviser and Administrator of Eaton Vance Global Bond Fund

Eaton Vance Management

Two International Place

Boston, MA 02110

Principal Underwriter*

Eaton Vance Distributors, Inc.

Two International Place

Boston, MA 02110

(617) 482-8260

Custodian

State Street Bank and Trust Company

State Street Financial Center, One Lincoln Street

Boston, MA 02111

Transfer Agent

BNY Mellon Investment Servicing (US) Inc.

Attn: Eaton Vance Funds

P.O. Box 9653

Providence, RI 02940-9653

(800) 262-1122

Fund Offices

Two International Place

Boston, MA 02110

* FINRA BrokerCheck.  Investors may check the background of their Investment Professional by contacting the Financial Industry Regulatory Authority (FINRA). FINRA BrokerCheck is a free tool to help investors check the professional background of current and former FINRA-registered securities firms and brokers. FINRA BrokerCheck is available by calling 1-800-289-9999 and at www.FINRA.org. The FINRA BrokerCheck brochure describing this program is available to investors at www.FINRA.org.

7758    4.30.20

Item 2. Code of Ethics

Not required in this filing.    

Item 3. Audit Committee Financial Expert

Not required in this filing.    

Item 4. Principal Accountant Fees and Services

Not required in this filing.

Item 5. Audit Committee of Listed Registrants

Not applicable.

Item 6. Schedule of Investments

Please see schedule of investments contained in the Report to Stockholders included under Item 1 of this Form N-CSR.

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

No material changes.

Item 11. Controls and Procedures

(a) It is the conclusion of the registrant’s principal executive officer and principal financial officer that the effectiveness of the registrant’s current disclosure controls and procedures (such disclosure controls and procedures having been evaluated within 90 days of the date of this filing) provide reasonable assurance that the information required to be disclosed by the registrant has been recorded, processed, summarized and reported within the time period specified in the Commission’s rules and forms and that the information required to be disclosed by the registrant has been accumulated and communicated to the registrant’s principal executive officer and principal financial officer in order to allow timely decisions regarding required disclosure.

(b) There have been no changes in the registrant’s internal controls over financial reporting during 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.

Item 12. Disclosure of Securities Lending Activities for Closed-End Management Investment Companies

Not applicable.

Item 13. Exhibits

(a)(1)	Registrant’s Code of Ethics – Not applicable (please see Item 2).
(a)(2)(i)	Treasurer’s Section 302 certification.
(a)(2)(ii)	President’s Section 302 certification.
(b)	Combined Section 906 certification.

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.

International Income Portfolio
By:	/s/ Payson F. Swaffield
	Payson F. Swaffield
	President
Date:	June 24, 2020

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/ James F. Kirchner
	James F. Kirchner
	Treasurer
Date:	June 24, 2020
By:	/s/ Payson F. Swaffield
	Payson F. Swaffield
	President
Date:	June 24, 2020