N-CSR

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: 811-23136

Eaton Vance High Income 2021 Target Term Trust

(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)

March 31

Date of Fiscal Year End

March 31, 2018

Date of Reporting Period

Item 1. Reports to Stockholders

Eaton Vance

High Income 2021 Target Term Trust (EHT)

Annual Report

March 31, 2018

Commodity Futures Trading Commission Registration. Effective December 31, 2012, the Commodity Futures Trading Commission (“CFTC”) adopted certain regulatory changes that subject registered investment companies and advisers to regulation by the CFTC if a fund invests more than a prescribed level of its assets in certain CFTC-regulated instruments (including futures, certain options and swap agreements) or markets itself as providing investment exposure to such instruments. The Fund has claimed an exclusion from the definition of the term “commodity pool operator” under the Commodity Exchange Act. Accordingly, neither the Fund nor the adviser with respect to the operation of the Fund is subject to CFTC regulation. Because of its management of other strategies, the Fund’s adviser is registered with the CFTC as a commodity pool operator and a commodity trading advisor.

Fund shares are not insured by the FDIC and are not deposits or other obligations of, or guaranteed by, any depository institution. Shares are subject to investment risks, including possible loss of principal invested.

Annual Report March 31, 2018

Eaton Vance

High Income 2021 Target Term Trust

Table of Contents

Management’s Discussion of Fund Performance	2
Performance	3
Fund Profile	4
Endnotes and Additional Disclosures	5
Financial Statements	6
Report of Independent Registered Public Accounting Firm	19
Federal Tax Information	20
Annual Meeting of Shareholders	21
Dividend Reinvestment Plan	22
Management and Organization	24
Important Notices	26

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Management’s Discussion of Fund Performance¹

Economic and Market Conditions

The year ended March 31, 2018 was a tale of two halves for high-yield corporate bonds. In the first half of the 12-month period, the asset class benefited from an improving economic backdrop, which fueled positive earnings momentum. In addition, volatility and interest rates were low, encouraging investors to take on more risk for added yield. In the second half of the period, economic growth remained solid and fundamentals for high-yield issuers continued to improve. However, high-yield bond returns stalled as volatility picked up starting last fall when an expected merger in the telecommunications sector fell through. Largely disappointing third-quarter earnings throughout the telecommunications and cable/satellite television sectors concerned investors that these troubles might be the first cracks to signal a more widespread fundamental weakening in high yield. The asset class began to recover as it became clear that the weakness was contained to these sectors and as oil prices strengthened. Volatility returned in mid-January 2018, however, as inflation fears triggered a sell-off in equity markets and yields on 10-year Treasurys rose to multiyear highs.

Against this backdrop, the trailing 12-month default rate for high-yield bonds edged up to 2.2% by period-end, but remained well below the long-term average. Corporate leverage and interest coverage improved incrementally quarter by quarter. Retail demand weakened as the year progressed, but institutional demand, which accounts for approximately three quarters of the high-yield investor base, remained relatively consistent. Meanwhile, net new issuance decreased. Over the year, average yields in the asset class rose from 5.88% to 6.35%.

The ICE BofAML U.S. High Yield Cash Pay BB-B (1-3 Year) Index² returned 3.48% for the year ended March 31, 2018. This performance was not far behind the 3.69% return of the broader (and longer duration) ICE BofAML U.S. High Yield Index and beat the 1.20% return of the Bloomberg Barclays U.S. Aggregate Bond Index.

Fund Performance

For the year ended March 31, 2018, Eaton Vance High Income 2021 Target Term Trust (the Fund) had a total return of 3.64% at net asset value (NAV). The Fund is managed against the stated objectives of delivering high current income and returning the initial NAV of $9.85 (before deduction

of offering costs) per common share to shareholders after five years. At period end, the Fund’s NAV was $10.04.

Credit selection was the biggest driver of the Fund’s performance this past year, with notable gains from selection in the two- to five-year duration⁹ segment. Favorable credit selection and a sizable underweight in the higher quality BB-rated⁸ category also helped, as the lower-quality segments generally outperformed the higher-quality segments. An overweight and credit selection within the better-performing B-rated category further aided performance, as did exposure to CCC-rated bonds.

In terms of sectors, the Fund benefited most from credit selection in the health care and technology sectors. The top performing name was a pharmaceutical company that benefited from consistently utilizing free cash flow from earnings and asset divestitures to pay down debt. Elsewhere, an overweight and credit selection within the strong-performing energy sector and credit selection within the metals/mining sector were both accretive to performance. Lastly, the Fund’s 24% gross leverage aided performance.

Though offset by positive credit selection, positioning across duration segments was challenging. A sizable overweight in the two- to five-year duration category hindered results, as this segment lagged bonds with duration less than two years. Credit selection and an underweight in this segment also detracted. A stake in the higher-quality BBB-rated category further hampered performance, but was largely offset by positive credit selection. Investment choices in the CCC-rated segment were an added headwind. In terms of sector returns which proved challenging, credit selection and an underweight in the better-performing diversified financial services sector hurt most. Credit selection in the gaming sector was also a headwind.

See Endnotes and Additional Disclosures in this report.

Past performance is no guarantee of future results. Returns are historical and are calculated by determining the percentage change in net asset value (NAV) or market price (as applicable) with all distributions reinvested and include management fees and other expenses. Fund performance at market price will differ from its results at NAV due to factors such as changing perceptions about the Fund, market conditions, fluctuations in supply and demand for Fund shares, or changes in Fund distributions. Investment return and principal value will fluctuate so that shares, when sold, may be worth more or less than their original cost. Performance less than or equal to one year is cumulative. Performance is for the stated time period only; due to market volatility, current Fund performance may be lower or higher than the quoted return. For performance as of the most recent month-end, please refer to eatonvance.com.

2

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Performance³

Portfolio Managers Michael W. Weilheimer, CFA, Stephen C. Concannon, CFA and Kelley G. Baccei

% Average Annual Total Returns	Inception Date		One Year			Five Years		Since Inception
Fund at NAV		05/31/2016		3.64	%		—		6.95	%
Fund at Market Price		—		4.53			—		6.02
% Premium/Discount to NAV4
									–1.59	%
Distributions5
Total Distributions per share for the period								$	0.600
Distribution Rate at NAV									5.98	%
Distribution Rate at Market Price									6.07	%
% Total Leverage6
Borrowings									23.72	%

See Endnotes and Additional Disclosures in this report.

Past performance is no guarantee of future results. Returns are historical and are calculated by determining the percentage change in net asset value (NAV) or market price (as applicable) with all distributions reinvested and include management fees and other expenses. Fund performance at market price will differ from its results at NAV due to factors such as changing perceptions about the Fund, market conditions, fluctuations in supply and demand for Fund shares, or changes in Fund distributions. Investment return and principal value will fluctuate so that shares, when sold, may be worth more or less than their original cost. Performance less than or equal to one year is cumulative. Performance is for the stated time period only; due to market volatility, current Fund performance may be lower or higher than the quoted return. For performance as of the most recent month-end, please refer to eatonvance.com.

3

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Fund Profile

Top 10 Sectors (% of total investments)⁷

Energy	17.2	%
Health Care	10.6
Technology	7.0
Diversified Financial Services	6.3
Cable/Satellite TV	6.3
Gaming	6.2
Telecommunications	5.8
Super Retail	3.7
Metals/Mining	3.7
Utilities	3.6
Total	70.4	%

Credit Quality (% of bond and loans holdings)⁸

Asset Allocation (% of total investments)

See Endnotes and Additional Disclosures in this report.

4

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Endnotes and Additional Disclosures

¹ The views expressed in this report are those of the portfolio manager(s) and are current only through the date stated at the top of this page. These views are subject to change at any time based upon market or other conditions, and Eaton Vance and the Fund(s) disclaim any responsibility to update such views. These views may not be relied upon as investment advice and, because investment decisions are based on many factors, may not be relied upon as an indication of trading intent on behalf of any Eaton Vance fund. This commentary may contain statements that are not historical facts, referred to as “forward looking statements”. The Fund’s actual future results may differ significantly from those stated in any forward looking statement, depending on factors such as changes in securities or financial markets or general economic conditions, the volume of sales and purchases of Fund shares, the continuation of investment advisory, administrative and service contracts, and other risks discussed from time to time in the Fund’s filings with the Securities and Exchange Commission.

²  ICE BofAML U.S. High Yield Cash Pay BB-B (1-3 Year) Index is an unmanaged index of U.S. corporate bonds currently paying a coupon, rated BB1 through B3, and having a maturity less than 3 years. ICE BofAML U.S. High Yield Index is an unmanaged index of below-investment grade U.S. corporate bonds. ICE Data Indices, LLC indices not for redistribution or other uses; provided “as is”, without warranties, and with no liability. Eaton Vance has prepared this report, ICE Data Indices, LLC does not endorse it, or guarantee, review, or endorse Eaton Vance’s products. Bloomberg Barclays U.S. Aggregate Bond Index is an unmanaged index of domestic investment-grade bonds, including corporate, government and mortgage-backed securities. Unless otherwise stated, index returns do not reflect the effect of any applicable sales charges, commissions, expenses, taxes or leverage, as applicable. It is not possible to invest directly in an index.

³ Performance results reflect the effects of leverage. Performance since inception for an index, if presented, is the performance since the Fund’s or oldest share class’ inception, as applicable.

⁴ The shares of the Fund often trade at a discount or premium from their net asset value. The discount or premium of the Fund may vary over time and may be higher or lower than what is quoted in this report. For up-to-date premium/discount information, please refer to http://eatonvance.com/closedend.

⁵ The Distribution Rate is based on the Fund’s last regular distribution per share in the period (annualized) divided by the Fund’s NAV or market price at the end of the period. The Fund’s distributions may be comprised of amounts characterized for federal income tax purposes as qualified and non-qualified ordinary dividends, capital gains and nondividend distributions, also known as return of capital. For additional information about nondividend distributions, please refer to Eaton Vance Closed-End Fund Distribution Notices (19a) posted on our website, eatonvance.com. The Fund will determine the federal income tax character of distributions paid to a shareholder after the end of the calendar year. This is reported on the IRS form 1099-DIV and provided to the shareholder shortly after each year- end. For information about the tax character of distributions made in prior calendar years, please refer to Performance-Tax Character of Distributions on the Fund’s webpage available at eatonvance.com.

The Fund’s distributions are determined by the investment adviser based on its current assessment of the Fund’s long-term return potential. Fund distributions may be affected by numerous factors including changes in Fund performance, the cost of financing for leverage, portfolio holdings, realized and projected returns, and other factors. As portfolio and market conditions change, the rate of distributions paid by the Fund could change.

⁶  Total leverage is shown as a percentage of the Fund’s aggregate net assets plus borrowings outstanding. The Fund employs leverage through borrowings. Use of leverage creates an opportunity for income, but creates risks including greater price volatility. The cost of borrowings rises and falls with changes in short-term interest rates. The Fund may be required to maintain prescribed asset coverage for its leverage and may be required to reduce its leverage at an inopportune time.

⁷ Excludes cash and cash equivalents.

⁸ Credit ratings are categorized using S&P. If S&P does not publish a rating, then the Moody’s rating is applied. Ratings, which are subject to change, apply to the creditworthiness of the issuers of the underlying securities and not to the Fund or its shares. Credit ratings measure the quality of a bond based on the issuer’s creditworthiness, with ratings ranging from AAA, being the highest, to D, being the lowest based on S&P’s measures. Ratings of BBB or higher by S&P or Baa or higher by Moody’s are considered to be investment-grade quality. Credit ratings are based largely on the ratings agency’s analysis at the time of rating. The rating assigned to any particular security is not necessarily a reflection of the issuer’s current financial condition and does not necessarily reflect its assessment of the volatility of a security’s market value or of the liquidity of an investment in the security. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

⁹ Duration is a measure of the expected change in price of a bond — in percentage terms — given a one percent change in interest rates, all else being constant. Securities with lower durations tend to be less sensitive to interest rate changes.

Fund profile subject to change due to active management.

   Important Notice to Shareholders

Effective October 23, 2017, the BofA Merrill Lynch indices have been rebranded as Intercontinental Exchange’s (“ICE”) BofAML indices.

5

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Portfolio of Investments

Corporate Bonds & Notes — 120.2%
Security	Principal Amount (000’s omitted)		Value
Aerospace — 4.2%
Bombardier, Inc., 8.75%, 12/1/21(1)	$	4,500	$	4,955,625
TransDigm, Inc., 5.50%, 10/15/20		4,000		4,030,000
			$	8,985,625
Air Transportation — 1.3%
Air Canada, 7.75%, 4/15/21(1)	$	2,500	$	2,743,750
			$	2,743,750
Banks & Thrifts — 1.2%
Ally Financial, Inc., 4.25%, 4/15/21	$	1,000	$	1,008,750
CIT Group, Inc., 3.875%, 2/19/19		1,200		1,208,700
CIT Group, Inc., 4.125%, 3/9/21		420		423,150
			$	2,640,600
Broadcasting — 0.7%
Netflix, Inc., 5.375%, 2/1/21	$	1,500	$	1,561,875
			$	1,561,875
Building Materials — 4.2%
Brundage-Bone Concrete Pumping, Inc., 10.375%, 9/1/21(1)	$	265	$	282,225
FBM Finance, Inc., 8.25%, 8/15/21(1)		6,710		7,045,500
Gibraltar Industries, Inc., 6.25%, 2/1/21		1,655		1,676,515
			$	9,004,240
Cable / Satellite TV — 8.2%
Cablevision Systems Corp., 8.00%, 4/15/20	$	3,500	$	3,699,062
Cequel Communications Holdings I, LLC/Cequel Capital Corp., 5.125%, 12/15/21(1)		5,070		5,087,762
CSC Holdings, LLC, 6.75%, 11/15/21		4,925		5,140,469
DISH DBS Corp., 6.75%, 6/1/21		3,635		3,680,438
			$	17,607,731
Capital Goods — 1.7%
Anixter, Inc., 5.125%, 10/1/21	$	3,500	$	3,618,125
			$	3,618,125
Chemicals — 1.2%
W.R. Grace & Co., 5.125%, 10/1/21(1)	$	2,500	$	2,565,625
			$	2,565,625

Security	Principal Amount (000’s omitted)		Value
Consumer Products — 0.7%
Edgewell Personal Care Co., 4.70%, 5/19/21	$	1,500	$	1,481,250
			$	1,481,250
Containers — 1.9%
Ball Corp., 4.375%, 12/15/20	$	4,000	$	4,080,000
			$	4,080,000
Diversified Financial Services — 8.2%
AerCap Ireland Capital, Ltd./AerCap Global Aviation Trust, 4.50%, 5/15/21	$	1,000	$	1,024,889
Alliance Data Systems Corp., 5.875%, 11/1/21(1)		2,394		2,447,865
DAE Funding, LLC, 4.00%, 8/1/20(1)		3,295		3,220,862
Icahn Enterprises, L.P./Icahn Enterprises Finance Corp., 6.00%, 8/1/20		3,585		3,658,941
Navient Corp., 4.875%, 6/17/19		1,000		1,010,500
Navient Corp., 5.50%, 1/15/19		1,000		1,013,500
Park Aerospace Holdings, Ltd., 3.625%, 3/15/21(1)		5,500		5,238,750
			$	17,615,307
Energy — 20.6%
Antero Resources Corp., 5.375%, 11/1/21	$	3,450	$	3,523,312
Canbriam Energy, Inc., 9.75%, 11/15/19(1)		2,595		2,659,875
Denbury Resources, Inc., 9.00%, 5/15/21(1)		81		83,430
Energy Transfer Equity, L.P., 7.50%, 10/15/20		2,000		2,158,750
Great Western Petroleum, LLC/Great Western Finance Corp., 9.00%, 9/30/21(1)		3,185		3,280,550
Nabors Industries, Inc., 4.625%, 9/15/21		3,000		2,910,750
Oasis Petroleum, Inc., 6.50%, 11/1/21		3,000		3,052,500
Resolute Energy Corp., 8.50%, 5/1/20		480		480,000
Sabine Pass Liquefaction, LLC, 5.625%, 2/1/21		4,500		4,733,428
SESI, LLC, 7.125%, 12/15/21		3,850		3,927,000
SM Energy Co., 6.50%, 11/15/21		3,000		3,037,500
Tervita Escrow Corp., 7.625%, 12/1/21(1)		4,145		4,226,118
Weatherford International, Ltd., 5.125%, 9/15/20		835		801,600
Whiting Petroleum Corp., 5.75%, 3/15/21		2,500		2,531,200
Williams Cos., Inc. (The), 7.875%, 9/1/21		2,000		2,257,500
Williams Partners, L.P., 4.00%, 11/15/21		1,500		1,518,344
WPX Energy, Inc., 7.50%, 8/1/20		3,000		3,225,000
			$	44,406,857
Environmental — 3.1%
Clean Harbors, Inc., 5.125%, 6/1/21	$	2,230	$	2,263,450
GFL Environmental, Inc., 9.875%, 2/1/21(1)		4,120		4,356,900
			$	6,620,350

6 See Notes to Financial Statements.

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Portfolio of Investments — continued

Security	Principal Amount (000’s omitted)		Value
Food & Drug Retail — 2.0%
Safeway, Inc., 4.75%, 12/1/21	$	4,750	$	4,370,000
			$	4,370,000
Gaming — 7.5%
GLP Capital, L.P./GLP Financing II, Inc., 4.875%, 11/1/20	$	2,500	$	2,557,875
Jack Ohio Finance, LLC/Jack Ohio Finance 1 Corp., 6.75%, 11/15/21(1)		2,940		3,042,900
MGM Resorts International, 6.625%, 12/15/21		5,000		5,406,250
MGM Resorts International, 6.75%, 10/1/20		895		953,175
Rivers Pittsburgh Borrower, L.P./Rivers Pittsburgh Finance Corp., 6.125%, 8/15/21(1)		1,490		1,441,575
Studio City Co., Ltd., 7.25%, 11/30/21(1)		2,750		2,870,312
			$	16,272,087
Health Care — 13.7%
Centene Corp., 5.625%, 2/15/21	$	5,500	$	5,665,000
HCA Healthcare, Inc., 6.25%, 2/15/21		4,500		4,736,250
Kinetic Concepts, Inc./KCI USA, Inc., 7.875%, 2/15/21(1)		2,500		2,575,000
Kinetic Concepts, Inc./KCI USA, Inc., 12.50%, 11/1/21(1)		2,230		2,531,050
Tenet Healthcare Corp., 6.00%, 10/1/20		4,000		4,150,000
Tenet Healthcare Corp., 7.50%, 1/1/22(1)		1,235		1,306,013
Teva Pharmaceutical Finance Co., B.V., 3.65%, 11/10/21		1,000		941,791
Teva Pharmaceutical Finance IV, LLC, 2.25%, 3/18/20		2,000		1,895,962
Valeant Pharmaceuticals International, Inc., 6.75%, 8/15/21(1)		750		754,688
Valeant Pharmaceuticals International, Inc., 7.50%, 7/15/21(1)		4,830		4,884,337
			$	29,440,091
Homebuilders / Real Estate — 2.5%
Taylor Morrison Communities, Inc./Monarch Communities, Inc., 5.25%, 4/15/21(1)	$	2,663	$	2,689,417
TRI Pointe Group, Inc., 4.875%, 7/1/21		2,750		2,774,887
			$	5,464,304
Insurance — 1.2%
Hub International, Ltd., 7.875%, 10/1/21(1)	$	2,500	$	2,590,625
			$	2,590,625
Leisure — 1.0%
NCL Corp., Ltd., 4.75%, 12/15/21(1)	$	2,055	$	2,080,688
			$	2,080,688

Security	Principal Amount (000’s omitted)		Value
Metals / Mining — 4.7%
Eldorado Gold Corp., 6.125%, 12/15/20(1)	$	4,110	$	3,914,775
First Quantum Minerals, Ltd., 7.00%, 2/15/21(1)		3,220		3,234,088
Freeport-McMoRan, Inc., 4.00%, 11/14/21		2,000		2,000,000
Hecla Mining Co., 6.875%, 5/1/21		1,000		1,022,500
			$	10,171,363
Publishing / Printing — 0.7%
MHGE Parent, LLC/MHGE Parent Finance, Inc., 8.50%, (8.50% cash or 9.25% PIK), 8/1/19(1)(2)	$	1,499	$	1,489,631
			$	1,489,631
Restaurants — 1.1%
Yum! Brands, Inc., 3.75%, 11/1/21	$	2,500	$	2,478,125
			$	2,478,125
Services — 3.1%
ADT Corp. (The), 6.25%, 10/15/21	$	3,000	$	3,142,500
West Corp., 4.75%, 7/15/21(1)		3,520		3,581,600
			$	6,724,100
Steel — 3.1%
Allegheny Technologies, Inc., 5.95%, 1/15/21	$	4,155	$	4,258,875
Steel Dynamics, Inc., 5.125%, 10/1/21		1,500		1,528,050
United States Steel Corp., 8.375%, 7/1/21(1)		795		855,380
			$	6,642,305
Super Retail — 4.8%
Hot Topic, Inc., 9.25%, 6/15/21(1)	$	385	$	383,075
L Brands, Inc., 6.625%, 4/1/21		4,000		4,270,000
Michaels Stores, Inc., 5.875%, 12/15/20(1)		2,725		2,762,469
Penske Automotive Group, Inc., 3.75%, 8/15/20		3,000		2,977,500
			$	10,393,044
Technology — 9.0%
CommScope, Inc., 5.00%, 6/15/21(1)	$	2,500	$	2,543,750
Dell International, LLC/EMC Corp., 4.42%, 6/15/21(1)		2,500		2,565,813
Dell International, LLC/EMC Corp., 5.875%, 6/15/21(1)		5,500		5,644,375
Infor Software Parent, LLC/Infor Software Parent, Inc., 7.125%, (7.125% cash or 7.875% PIK), 5/1/21(1)(2)		6,000		6,082,500
NXP B.V./NXP Funding, LLC, 4.125%, 6/1/21(1)		2,500		2,531,250
			$	19,367,688

7 See Notes to Financial Statements.

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Portfolio of Investments — continued

Security	Principal Amount (000’s omitted)		Value
Telecommunications — 7.5%
CenturyLink, Inc., 6.45%, 6/15/21	$	2,500	$	2,562,500
Digicel, Ltd., 6.00%, 4/15/21(1)		4,055		3,821,838
GCI, Inc., 6.75%, 6/1/21		1,367		1,385,796
Hughes Satellite Systems Corp., 7.625%, 6/15/21		1,000		1,076,920
Sprint Corp., 7.25%, 9/15/21		7,000		7,253,750
			$	16,100,804
Transportation Ex Air / Rail — 0.9%
CEVA Group PLC, 7.00%, 3/1/21(1)	$	2,000	$	1,970,000
			$	1,970,000
Utilities — 0.2%
AES Corp. (The), 4.00%, 3/15/21	$	400	$	402,500
			$	402,500
Total Corporate Bonds & Notes (identified cost $257,787,054)			$	258,888,690
Senior Floating-Rate Loans — 3.9%(3)
Borrower/Tranche Description	Principal Amount (000’s omitted)		Value
Automotive & Auto Parts — 0.9%
American Tire Distributors Holdings, Inc.
Term Loan, 6.24%, (2 mo. USD LIBOR + 4.25%), Maturing September 1, 2021	$	1,975	$	2,000,831
			$	2,000,831
Energy — 1.6%
Chesapeake Energy Corporation
Term Loan, 9.44%, (3 mo. USD LIBOR + 7.50%), Maturing August 23, 2021	$	3,265	$	3,470,081
			$	3,470,081
Gaming — 0.5%
GLP Financing, LLC
Term Loan, 3.29%, (1 mo. USD LIBOR + 1.50%), Maturing April 28, 2021	$	1,000	$	992,500
			$	992,500

Borrower/Tranche Description	Principal Amount (000’s omitted)		Value
Services — 0.9%
Brickman Group, Ltd., LLC
Term Loan - Second Lien, 8.31%, (1 mo. USD LIBOR + 6.50%), Maturing December 17, 2021	$	1,872	$	1,888,139
			$	1,888,139
Total Senior Floating-Rate Loans (identified cost $8,106,693)			$	8,351,551
Convertible Bonds — 4.5%
Security	Principal Amount (000’s omitted)		Value
Utilities — 4.5%
NRG Yield, Inc., 3.25%, 6/1/20(1)	$	4,500	$	4,467,416
Pattern Energy Group, Inc., 4.00%, 7/15/20		2,455		2,433,980
Tesla Energy Operations, Inc., 1.625%, 11/1/19		3,000		2,744,985
			$	9,646,381
Total Convertible Bonds (identified cost $9,732,745)			$	9,646,381
Short-Term Investments — 0.5%
Description	Units		Value
Eaton Vance Cash Reserves Fund, LLC, 1.89%(4)		1,159,567	$	1,159,335
Total Short-Term Investments (identified cost $1,159,335)			$	1,159,335
Total Investments — 129.1% (identified cost $276,785,827)			$	278,045,957
Other Assets, Less Liabilities — (29.1)%			$	(62,612,537	)
Net Assets — 100.0%			$	215,433,420

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

⁽¹⁾  Security exempt from registration pursuant to Rule 144A under the Securities Act of 1933, as amended. These securities may be sold in certain transactions in reliance on an exemption from registration (normally to qualified institutional buyers). At March 31, 2018, the aggregate value of these securities is $120,809,402 or 56.1% of the Trust’s net assets.

⁽²⁾  Represents a payment-in-kind security which may pay interest in additional principal at the issuer’s discretion.

8 See Notes to Financial Statements.

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Portfolio of Investments — continued

⁽³⁾  Senior floating-rate loans (Senior Loans) often require prepayments from excess cash flows or permit the borrowers to repay at their election. The degree to which borrowers repay, whether as a contractual requirement or at their election, cannot be predicted with accuracy. As a result, the actual remaining maturity may be substantially less than the stated maturities shown. However, Senior Loans will typically have an expected average life of approximately two to four years. Senior Loans typically have rates of interest which are redetermined periodically by reference to a base lending rate, plus a spread. These base lending rates are primarily the London Interbank Offered Rate (“LIBOR”) and secondarily, the prime rate offered by one or more major United States banks (the “Prime Rate”). Base lending rates may be subject to a floor, or minimum rate.

⁽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 March 31, 2018.

Abbreviations:

LIBOR	–	London Interbank Offered Rate
PIK	–	Payment In Kind

Currency Abbreviations:

USD – United States Dollar

9 See Notes to Financial Statements.

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Statement of Assets and Liabilities

Assets	March 31, 2018
Unaffiliated investments, at value (identified cost, $275,626,492)	$	276,886,622
Affiliated investment, at value (identified cost, $1,159,335)		1,159,335
Cash		14,495
Interest receivable		4,738,334
Dividends receivable from affiliated investment		2,406
Prepaid upfront fees on notes payable		53,527
Prepaid expenses		12,026
Total assets	$	282,866,745
Liabilities
Notes payable	$	67,000,000
Payable to affiliate:
Investment adviser fee		169,240
Interest expense and fees payable		184,895
Accrued expenses		79,190
Total liabilities	$	67,433,325
Net Assets	$	215,433,420
Sources of Net Assets
Common shares, $0.01 par value, unlimited number of shares authorized, 21,460,961 shares issued and outstanding	$	214,610
Additional paid-in capital		210,695,874
Accumulated undistributed net investment income		256,723
Accumulated net realized gain		3,006,083
Net unrealized appreciation		1,260,130
Net Assets	$	215,433,420
Net Asset Value
($215,433,420 ÷ 21,460,961 common shares issued and outstanding)	$	10.04

10 See Notes to Financial Statements.

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Statement of Operations

Investment Income	Year Ended March 31, 2018
Interest and other income	$	15,370,086
Dividends from affiliated investment		35,931
Total investment income	$	15,406,017
Expenses
Investment adviser fee	$	1,984,781
Trustees’ fees and expenses		13,989
Custodian fee		87,528
Transfer and dividend disbursing agent fees		19,415
Legal and accounting services		51,227
Printing and postage		28,368
Interest expense and fees		1,619,499
Miscellaneous		88,801
Total expenses	$	3,893,608
Net investment income	$	11,512,409
Realized and Unrealized Gain (Loss)
Net realized gain (loss) —
Investment transactions	$	2,708,820
Investment transactions — affiliated investment		(774	)
Net realized gain	$	2,708,046
Change in unrealized appreciation (depreciation) —
Investments	$	(6,634,250	)
Net change in unrealized appreciation (depreciation)	$	(6,634,250	)
Net realized and unrealized loss	$	(3,926,204	)
Net increase in net assets from operations	$	7,586,205

11 See Notes to Financial Statements.

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Statements of Changes in Net Assets

Increase (Decrease) in Net Assets	Year Ended March 31, 2018			Period Ended March 31,  2017(1)
From operations —
Net investment income	$	11,512,409		$	10,203,251
Net realized gain		2,708,046			1,320,610
Net change in unrealized appreciation (depreciation)		(6,634,250	)		7,894,380
Net increase in net assets from operations	$	7,586,205		$	19,418,241
Distributions to shareholders —
From net investment income	$	(12,876,577	)	$	(9,657,422	)
Total distributions	$	(12,876,577	)	$	(9,657,422	)
Capital share transactions —
Proceeds from sale of shares	$	—		$	211,290,971	(2)
Reinvestment of distributions to shareholders		—			1,019
Offering costs		—			(429,017	)
Net increase in net assets from capital share transactions	$	—		$	210,862,973
Net increase (decrease) in net assets	$	(5,290,372	)	$	220,623,792
Net Assets
At beginning of period	$	220,723,792		$	100,000
At end of period	$	215,433,420		$	220,723,792
Accumulated undistributed net investment income included in net assets
At end of period	$	256,723		$	257,485

⁽¹⁾  For the period from the start of business, May 31, 2016, to March 31, 2017.

⁽²⁾  Proceeds from sale of shares are net of sales load paid of $3,217,629 and include shares sold from the exercise of the underwriters’ over-allotment option of $24,508,600 (see Note 5).

12 See Notes to Financial Statements.

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Statement of Cash Flows

Cash Flows From Operating Activities	Year Ended March 31, 2018
Net increase in net assets from operations	$	7,586,205
Adjustments to reconcile net increase in net assets from operations to net cash provided by operating activities:
Investments purchased		(147,260,921	)
Investments sold and principal repayments		150,239,805
Decrease in short-term investments, net		3,497,831
Net amortization/accretion of premium (discount)		1,703,259
Amortization of prepaid upfront fees on notes payable		45,599
Decrease in interest receivable		119,474
Decrease in dividends receivable from affiliated investment		645
Decrease in prepaid expenses		10,246
Decrease in payable to affiliate for investment adviser fee		(3,146	)
Increase in interest expense and fees payable		42,958
Decrease in accrued expenses		(25,812	)
Net change in unrealized (appreciation) depreciation from investments		6,634,250
Net realized gain from investments		(2,708,046	)
Net cash provided by operating activities	$	19,882,347
Cash Flows From Financing Activities
Distributions paid, net of reinvestments	$	(12,876,577	)
Proceeds from notes payable		55,000,000
Repayments of notes payable		(63,000,000	)
Net cash used in financing activities	$	(20,876,577	)
Net decrease in cash	$	(994,230	)
Cash at beginning of year	$	1,008,725
Cash at end of year	$	14,495
Supplemental disclosure of cash flow information:
Cash paid for interest and fees on borrowings	$	1,530,942

13 See Notes to Financial Statements.

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Financial Highlights

	Year Ended March 31, 2018			Period Ended March 31,  2017(1)
Net asset value — Beginning of period	$	10.280		$	9.850	(2)
Income (Loss) From Operations
Net investment income(3)	$	0.536		$	0.483
Net realized and unrealized gain (loss)		(0.176	)		0.439
Total income from operations	$	0.360		$	0.922
Less Distributions
From net investment income	$	(0.600	)	$	(0.450	)
Total distributions	$	(0.600	)	$	(0.450	)
Offering costs charged to paid-in capital	$	—		$	(0.020	)(3)
Discount related to exercise of underwriters’ over-allotment option	$	—		$	(0.022	)(3)
Net asset value — End of period	$	10.040		$	10.280
Market value — End of period	$	9.880		$	10.030
Total Investment Return on Net Asset Value(4)		3.64	%		9.14	%(5)(6)
Total Investment Return on Market Value(4)		4.53	%		6.49	%(5)(6)
Ratios/Supplemental Data
Net assets, end of period (000’s omitted)	$	215,433		$	220,724
Ratios (as a percentage of average daily net assets):
Expenses excluding interest and fees		1.03	%		1.04	%(7)
Interest and fee expense(8)		0.74	%		0.52	%(7)
Total expenses		1.77	%		1.56	%(7)
Net investment income		5.23	%		5.71	%(7)
Portfolio Turnover		53	%		40	%(5)

⁽¹⁾  For the period from the start of business, May 31, 2016, to March 31, 2017.

⁽²⁾  Net asset value at beginning of period reflects the deduction of the sales charge of $0.15 per share paid by the shareholders from the $10.00 offering price.

⁽³⁾  Computed using average shares outstanding.

⁽⁴⁾  Returns are historical and are calculated by determining the percentage change in net asset value or market value with all distributions reinvested. Distributions are assumed to be reinvested at prices obtained under the Trust’s dividend reinvestment plan.

⁽⁵⁾  Not annualized.

⁽⁶⁾  Total investment return on net asset value is calculated assuming a purchase at the offering price of $10.00 less the sales load of $0.15 per share paid by the shareholder on the first day and a sale at the net asset value on the last day of the period reported with all distributions reinvested. Total investment return on market value is calculated assuming a purchase at the offering price of $10.00 less the sales load of $0.15 per share paid by the shareholder on the first day and a sale at the current market price on the last day of the period reported with all distributions reinvested.

⁽⁷⁾  Annualized.

⁽⁸⁾  Interest and fee expense relates to borrowings for the purpose of financial leverage (see Note 6).

14 See Notes to Financial Statements.

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Notes to Financial Statements

1  Significant Accounting Policies

Eaton Vance High Income 2021 Target Term Trust (the Trust) is a Massachusetts business trust registered under the Investment Company Act of 1940, as amended (the 1940 Act), as a diversified, closed-end management investment company. The Trust was organized on February 5, 2016 and remained inactive until May 31, 2016, except for matters relating to its organization, including the sale of 10,000 shares for $100,000 to Eaton Vance Management (EVM). The Trust’s investment objectives are high current income and to return $9.85 per share, the original net asset value per common share before deducting offering costs of $0.02 per common share (“Original NAV”), to holders of common shares on or about July 1, 2021 (the “Termination Date”). On or about the Termination Date, the Trust intends to cease its investment operations, liquidate its portfolio, retire or redeem its leverage facilities, and seek to return Original NAV to common shareholders, unless the term is extended for one period of up to six months by a vote of the Trust’s Board of Trustees.

The following is a summary of significant accounting policies of the Trust. The policies are in conformity with accounting principles generally accepted in the United States of America (U.S. GAAP). The Trust 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 asked 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 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.

Senior Floating-Rate Loans. Interests in senior floating-rate loans (Senior Loans) for which reliable market quotations are readily available are valued generally at the average mean of bid and ask quotations obtained from a third party pricing service. Other Senior Loans are valued at fair value by the investment adviser under procedures approved by the Trustees. In fair valuing a Senior Loan, the investment adviser utilizes one or more of the valuation techniques described in (i) through (iii) below to assess the likelihood that the borrower will make a full repayment of the loan underlying such Senior Loan relative to yields on other Senior Loans issued by companies of comparable credit quality. If the investment adviser believes that there is a reasonable likelihood of full repayment, the investment adviser will determine fair value using a matrix pricing approach that considers the yield on the Senior Loan. If the investment adviser believes there is not a reasonable likelihood of full repayment, the investment adviser will determine fair value using analyses that include, but are not limited to: (i) a comparison of the value of the borrower’s outstanding equity and debt to that of comparable public companies; (ii) a discounted cash flow analysis; or (iii) when the investment adviser believes it is likely that a borrower will be liquidated or sold, an analysis of the terms of such liquidation or sale. In certain cases, the investment adviser will use a combination of analytical methods to determine fair value, such as when only a portion of a borrower’s assets are likely to be sold. In conducting its assessment and analyses for purposes of determining fair value of a Senior Loan, the investment adviser will use its discretion and judgment in considering and appraising relevant factors. Fair value determinations are made by the portfolio managers of the Trust based on information available to such managers. The portfolio managers of other funds managed by the investment adviser that invest in Senior Loans may not possess the same information about a Senior Loan borrower as the portfolio managers of the Trust. At times, the fair value of a Senior Loan determined by the portfolio managers of other funds managed by the investment adviser that invest in Senior Loans may vary from the fair value of the same Senior Loan determined by the portfolio managers of the Trust. The fair value of each Senior Loan is periodically reviewed and approved by the investment adviser’s Valuation Committee and by the Trustees based upon procedures approved by the Trustees. Junior Loans (i.e., subordinated loans and second lien loans) are valued in the same manner as Senior Loans.

Affiliated Fund. The Trust may invest in Eaton Vance Cash Reserves Fund, LLC (Cash Reserves Fund), an affiliated investment company managed by 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 Trust in a manner that fairly reflects the security’s value, or the amount that the Trust 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 condition, 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. Fees associated with loan amendments are recognized immediately. Dividend income is recorded on the ex-dividend date for dividends received in cash and/or securities.

15

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Notes to Financial Statements — continued

D  Federal Taxes — The Trust intends to make monthly distributions of net investment income and any net realized capital gains in amounts necessary to maintain its taxation as a regulated investment company for U.S. federal income tax purposes. For the purpose of pursuing its investment objective of returning Original NAV, the Trust may retain a portion of its net investment income and some or all of its net capital gains, which would result in the Trust paying U.S. federal excise and corporate income taxes.

As of March 31, 2018, the Trust had no uncertain tax positions that would require financial statement recognition, de-recognition, or disclosure. The Trust 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  Organization and Offering Costs — Organization costs paid in connection with the organization of the Trust were borne directly by EVM, the Trust’s investment adviser. EVM agreed to pay all common share offering costs (other than sales loads) that exceed $0.02 per common share. Costs incurred by the Trust in connection with the offering of its common shares are recorded as a reduction of additional paid-in capital.

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 Trust’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 Trust. Under Massachusetts law, if certain conditions prevail, shareholders of a Massachusetts business trust (such as the Trust) could be deemed to have personal liability for the obligations of the Trust. However, the Trust’s Declaration of Trust contains an express disclaimer of liability on the part of Trust shareholders and the By-laws provide that the Trust shall assume the defense on behalf of any Trust shareholders. Moreover, the By-laws also provide for indemnification out of Trust property of any shareholder held personally liable solely by reason of being or having been a shareholder for all loss or expense arising from such liability. Additionally, in the normal course of business, the Trust enters into agreements with service providers that may contain indemnification clauses. The Trust’s maximum exposure under these arrangements is unknown as this would involve future claims that may be made against the Trust that have not yet occurred.

H  Statement of Cash Flows — The cash amount shown in the Statement of Cash Flows of the Trust is the amount included in the Trust’s Statement of Assets and Liabilities and represents the unrestricted cash on hand at its custodian and does not include any short-term investments.

2  Distributions to Shareholders and Income Tax Information

The Trust intends to make monthly distributions of net investment income to common shareholders. The Trust may also distribute net realized capital gains, if any, generally not more than once per year. Distributions are recorded on the ex-dividend date. Distributions to shareholders are determined in accordance with income tax regulations, which may differ from U.S. GAAP. As required by U.S. GAAP, only distributions in excess of tax basis earnings and profits are reported in the financial statements as a return of capital. Permanent differences between book and tax accounting relating to distributions are reclassified to paid-in capital. For tax purposes, distributions from short-term capital gains are considered to be from ordinary income.

The tax character of distributions declared for the year ended March 31, 2018 and for the period ended March 31, 2017 was as follows:

	Year Ended March 31, 2018		Period Ended March 31,  2017(1)
Distributions declared from:
Ordinary income	$	12,876,577	$	9,657,422

⁽¹⁾ For the period from the start of business, May 31, 2016, to March 31, 2017.

During the year ended March 31, 2018, accumulated net realized gain was decreased by $1,310,917, accumulated distributions in excess of net investment income was decreased by $1,363,406 and paid-in capital was decreased by $52,489 due to differences between book and tax accounting, primarily for premium amortization, accretion of market discount, non-deductible expenses and investments in partnerships. These reclassifications had no effect on the net assets or net asset value per share of the Trust.

As of March 31, 2018, the components of distributable earnings (accumulated losses) on a tax basis were as follows:

Undistributed ordinary income	$	1,268,558
Undistributed long-term capital gains	$	1,554,917
Net unrealized appreciation	$	1,699,461

16

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Notes to Financial Statements — continued

The differences between components of distributable earnings (accumulated losses) on a tax basis and the amounts reflected in the Statement of Assets and Liabilities are primarily due to investments in partnerships, premium amortization, accretion of market discount and the tax treatment of short-term capital gains.

The cost and unrealized appreciation (depreciation) of investments of the Trust at March 31, 2018, as determined on a federal income tax basis, were as follows:

Aggregate cost	$	276,346,496
Gross unrealized appreciation	$	3,256,873
Gross unrealized depreciation		(1,557,412	)
Net unrealized appreciation	$	1,699,461

3  Investment Adviser Fee and Other Transactions with Affiliates

The investment adviser fee is earned by EVM as compensation for investment advisory services rendered to the Trust. The fee is computed at an annual rate of 0.70% of the Trust’s average daily managed assets and is payable monthly. Managed assets as referred to herein represent total assets of the Trust (including assets attributable to borrowings, any outstanding preferred shares, or other forms of leverage) less accrued liabilities (other than liabilities representing borrowings or such other forms of leverage). For the year ended March 31, 2018, the investment adviser fee amounted to $1,984,781. The Trust invests its cash in Cash Reserves Fund. EVM does not currently receive a fee for investment advisory services provided to Cash Reserves Fund. EVM also serves as administrator of the Trust, but receives no compensation.

Trustees and officers of the Trust who are members of EVM’s organization receive remuneration for their services to the Trust out of the investment adviser fee. Trustees of the Trust who are not affiliated with EVM 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 year ended March 31, 2018, no significant amounts have been deferred. Certain officers and Trustees of the Trust are officers of EVM.

4  Purchases and Sales of Investments

Purchases and sales of investments, other than short-term obligations and including maturities and principal repayments on Senior Loans, aggregated $147,000,056 and $148,028,329, respectively, for the year ended March 31, 2018.

5  Common Shares of Beneficial Interest

In connection with the initial public offering of the Trust’s common shares, the underwriters were granted an option to purchase additional common shares at a price of $9.85 (after deduction of the sales load). Additional shares were issued by the Trust on July 11, 2016 pursuant to the exercise of the over-allotment option. The Trust’s net asset value per share on such date was $10.04, resulting in a discount of $465,663. The Trust may issue common shares pursuant to its dividend reinvestment plan, although no shares were issued by the Trust under the plan for the year ended March 31, 2018. Transactions in common shares for the period ended March 31, 2017 were as follows:

	Period Ended March 31, 2017(1)
Sales (initial public offering)		19,000,000
Exercise of over-allotment option by underwriters		2,450,860
Issued to shareholders electing to receive payments of distributions in Trust shares		101
Net increase		21,450,961

⁽¹⁾  For the period from the start of business, May 31, 2016, to March 31, 2017.

17

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Notes to Financial Statements — continued

6  Credit Agreement

The Trust has entered into a Credit Agreement (the Agreement) with a bank to borrow up to a limit of $75 million. Borrowings under the Agreement are secured by the assets of the Trust. Interest is charged at a rate above the London Interbank Offered Rate (LIBOR) and is payable monthly. Under the terms of the Agreement, in effect through June 3, 2019, the Trust pays a facility fee of 0.25% (0.35% if the Trust’s outstanding borrowings are less than 65% of the borrowing limit) per annum on the borrowing limit. The Trust paid upfront fees of $135,000 which are being amortized to interest expense over a period of three years through June 2019. The unamortized balance at March 31, 2018 is approximately $54,000 and is included in prepaid upfront fees on notes payable in the Statement of Assets and Liabilities. The Trust is required to maintain certain net asset levels during the term of the Agreement. At March 31, 2018, the Trust had borrowings outstanding under the Agreement of $67,000,000 at an interest rate of 2.63%. Based on the short-term nature of the borrowings under the Agreement and the variable interest rate, the carrying amount of the borrowings at March 31, 2018 approximated its fair value. If measured at fair value, borrowings under the Agreement would have been considered as Level 2 in the fair value hierarchy (see Note 8) at March 31, 2018. Facility fees for the year ended March 31, 2018 totaled $184,480 and are included in interest expense and fees on the Statement of Operations. For the year ended March 31, 2018, the average borrowings under the Agreement and average interest rate (excluding fees) were $63,657,534 and 2.18%, respectively.

7  Credit Risk

The Trust primarily invests in lower rated and comparable quality unrated high yield securities. These investments have different risks than investments in debt securities rated investment grade. Risk of loss upon default by the borrower is significantly greater with respect to such debt than with other debt securities because these securities are generally unsecured and are more sensitive to adverse economic conditions, such as recession or increasing interest rates, than are investment grade issuers.

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.

At March 31, 2018, the hierarchy of inputs used in valuing the Trust’s investments, which are carried at value, were as follows:

Asset Description	Level 1		Level 2		Level 3		Total
Corporate Bonds & Notes	$	—	$	258,888,690	$	—	$	258,888,690
Senior Floating-Rate Loans		—		8,351,551		—		8,351,551
Convertible Bonds		—		9,646,381		—		9,646,381
Short-Term Investments		—		1,159,335		—		1,159,335
Total Investments	$	—	$	278,045,957	$	—	$	278,045,957

At March 31, 2018, there were no investments transferred between Level 1 and Level 2 during the year then ended.

18

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Report of Independent Registered Public Accounting Firm

To the Trustees and Shareholders of Eaton Vance High Income 2021 Target Term Trust:

Opinion on the Financial Statements and Financial Highlights

We have audited the accompanying statement of assets and liabilities of Eaton Vance High Income 2021 Target Term Trust (the “Trust”), including the portfolio of investments, as of March 31, 2018, the related statements of operations and cash flows for the year then ended, the statements of changes in net assets and the financial highlights for the year ended March 31, 2018 and for the period from the start of business, May 31, 2016, to March 31, 2017, and the related notes. In our opinion, the financial statements and financial highlights present fairly, in all material respects, the financial position of the Trust as of March 31, 2018, and the results of its operations and its cash flows for the year then ended, and the changes in its net assets and financial highlights for the year ended March 31, 2018 and for the period from the start of business, May 31, 2016, to March 31, 2017, in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements and financial highlights are the responsibility of the Trust’s management. Our responsibility is to express an opinion on the Trust’s financial statements and financial highlights based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Trust in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement, whether due to error or fraud. The Trust is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Trust’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements and financial highlights, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements and financial highlights. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements and financial highlights. Our procedures included confirmation of securities and senior loans owned as of March 31, 2018, by correspondence with the custodian, brokers and selling or agent banks; when replies were not received from brokers and selling or agent banks, we performed other auditing procedures. We believe that our audits provide a reasonable basis for our opinion.

/s/ Deloitte & Touche LLP

Boston, Massachusetts

May 18, 2018

We have served as the auditor of one or more Eaton Vance investment companies since 1959.

19

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Federal Tax Information (Unaudited)

The Form 1099-DIV you receive in February 2019 will show the tax status of all distributions paid to your account in calendar year 2018. Shareholders are advised to consult their own tax adviser with respect to the tax consequences of their investment in the Trust. As required by the Internal Revenue Code and/or regulations, shareholders must be notified regarding capital gains dividends.

Capital Gains Dividends.  The Trust hereby designates as a capital gain dividend with respect to the taxable year ended March 31, 2018, $1,554,917 or, if subsequently determined to be different, the net capital gain of such year.

20

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Annual Meeting of Shareholders (Unaudited)

The Trust held its Annual Meeting of Shareholders on January 18, 2018. The following action was taken by the shareholders:

Item 1:  The election of George J. Gorman, Valerie A. Mosley and William H. Park as Class II Trustees of the Trust, each for a three-year term expiring in 2021.

Nominee for Trustee Elected by All Shareholders	Number of Shares
	For		Withheld
George J. Gorman		18,561,017		519,694
Valerie A. Mosley		18,506,866		573,845
William H. Park		18,558,017		522,694

21

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Dividend Reinvestment Plan

The Trust offers a dividend reinvestment plan (Plan) pursuant to which shareholders automatically have distributions reinvested in common shares (Shares) of the Trust unless they elect otherwise through their investment dealer. On the distribution payment date, if the NAV per Share is equal to or less than the market price per Share plus estimated brokerage commissions, then new Shares will be issued. The number of Shares shall be determined by the greater of the NAV per Share or 95% of the market price. Otherwise, Shares generally will be purchased on the open market by American Stock Transfer & Trust Company, LLC, the Plan agent (Agent). Distributions subject to income tax (if any) are taxable whether or not Shares are reinvested.

If your Shares are in the name of a brokerage firm, bank, or other nominee, you can ask the firm or nominee to participate in the Plan on your behalf. If the nominee does not offer the Plan, you will need to request that the Trust’s transfer agent re-register your Shares in your name or you will not be able to participate.

The Agent’s service fee for handling distributions will be paid by the Trust. Plan participants will be charged their pro rata share of brokerage commissions on all open-market purchases.

Plan participants may withdraw from the Plan at any time by writing to the Agent at the address noted on the following page. If you withdraw, you will receive Shares in your name for all Shares credited to your account under the Plan. If a participant elects by written notice to the Agent to sell part or all of his or her Shares and remit the proceeds, the Agent is authorized to deduct a $5.00 fee plus brokerage commissions from the proceeds.

If you wish to participate in the Plan and your Shares are held in your own name, you may complete the form on the following page and deliver it to the Agent. Any inquiries regarding the Plan can be directed to the Agent at 1-866-439-6787.

22

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Application for Participation in Dividend Reinvestment Plan

This form is for shareholders who hold their common shares in their own names. If your common shares are held in the name of a brokerage firm, bank, or other nominee, you should contact your nominee to see if it will participate in the Plan on your behalf. If you wish to participate in the Plan, but your brokerage firm, bank, or nominee is unable to participate on your behalf, you should request that your common shares be re-registered in your own name which will enable your participation in the Plan.

The following authorization and appointment is given with the understanding that I may terminate it at any time by terminating my participation in the Plan as provided in the terms and conditions of the Plan.

Please print exact name on account

Shareholder signature                                                          Date

Shareholder signature                                                          Date

Please sign exactly as your common shares are registered. All persons whose names appear on the share certificate must sign.

YOU SHOULD NOT RETURN THIS FORM IF YOU WISH TO RECEIVE YOUR DISTRIBUTIONS IN CASH. THIS IS NOT A PROXY.

This authorization form, when signed, should be mailed to the following address:

Eaton Vance High Income 2021 Target Term Trust

c/o American Stock Transfer & Trust Company, LLC

P.O. Box 922

Wall Street Station

New York, NY 10269-0560

23

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Management and Organization

Fund Management.  The Trustees of Eaton Vance High Income 2021 Target Term Trust (the Trust) are responsible for the overall management and supervision of the Trust’s affairs. The Trustees and officers of the Trust are listed below. Except as indicated, each individual has held the office shown or other offices in the same company for the last five years. The “Noninterested Trustees” consist of those Trustees who are not “interested persons” of the Trust, as that term is defined under the 1940 Act. The business address of each Trustee and officer is Two International Place, Boston, Massachusetts 02110. As used below, “EVC” refers to Eaton Vance Corp., “EV” refers to Eaton Vance, Inc., “EVM” refers to Eaton Vance Management, “BMR” refers to Boston Management and Research and “EVD” refers to Eaton Vance Distributors, Inc. EVC and EV are the corporate parent and trustee, respectively, of EVM and BMR. EVD is a wholly-owned subsidiary of EVC. Each officer affiliated with Eaton Vance may hold a position with other Eaton Vance affiliates that is comparable to his or her position with EVM listed below. Each Trustee oversees 174 portfolios in the Eaton Vance Complex (including all master and feeder funds in a master feeder structure). Each officer serves as an officer of certain other Eaton Vance funds. Each Trustee serves for a three year term. Each officer serves until his or her successor is elected.

Name and Year of Birth	Position(s) with the Trust	Term Expiring; Trustee  Since(1)	Principal Occupation(s) and Directorships During Past Five Years and Other Relevant Experience
Interested Trustee
Thomas E. Faust Jr. 1958	Class I Trustee	Until 2020. Trustee since 2007.	Chairman, Chief Executive Officer and President of EVC, Director and President of EV, Chief Executive Officer and President of EVM and BMR, and Director of EVD. Trustee and/or officer of 174 registered investment companies. Mr. Faust is an interested person because of his positions with EVM, BMR, EVD, EVC and EV, which are affiliates of the Trust. Directorships in the Last Five Years.(2) Director of EVC and Hexavest Inc. (investment management firm).
Noninterested Trustees
Mark R. Fetting 1954	Class III Trustee	Until 2019. Trustee since 2016.	Private investor. Formerly held various positions at Legg Mason, Inc. (investment management firm) (2000-2012), including President, Chief Executive Officer, Director and Chairman (2008-2012), Senior Executive Vice President (2004-2008) and Executive Vice President (2001-2004). Formerly, President of Legg Mason family of funds (2001-2008). Formerly, Division President and Senior Officer of Prudential Financial Group, Inc. and related companies (investment management firm) (1991-2000). Directorships in the Last Five Years. None.
Cynthia E. Frost 1961	Class I Trustee	Until 2020. Trustee since 2014.	Private investor. Formerly, Chief Investment Officer of Brown University (university endowment) (2000-2012); Formerly, Portfolio Strategist for Duke Management Company (university endowment manager) (1995-2000); Formerly, Managing Director, Cambridge Associates (investment consulting company) (1989-1995); Formerly, Consultant, Bain and Company (management consulting firm) (1987-1989); Formerly, Senior Equity Analyst, BA Investment Management Company (1983-1985). Directorships in the Last Five Years. None.
George J. Gorman 1952	Class II Trustee	Until 2021. Trustee since 2014.	Principal at George J. Gorman LLC (consulting firm). Formerly, Senior Partner at Ernst & Young LLP (a registered public accounting firm) (1974-2009). Directorships in the Last Five Years. Formerly, Trustee of the BofA Funds Series Trust (11 funds) (2011-2014) and of the Ashmore Funds (9 funds) (2010-2014).
Valerie A. Mosley 1960	Class II Trustee	Until 2021. Trustee since 2014.	Chairwoman and Chief Executive Officer of Valmo Ventures (a consulting and investment firm). Former Partner and Senior Vice President, Portfolio Manager and Investment Strategist at Wellington Management Company, LLP (investment management firm) (1992-2012). Former Chief Investment Officer, PG Corbin Asset Management (1990-1992). Formerly worked in institutional corporate bond sales at Kidder Peabody (1986-1990). Directorships in the Last Five Years.(2) Director of Dynex Capital, Inc. (mortgage REIT) (since 2013).
William H. Park 1947	Chairperson of the Board and Class II Trustee	Until 2021. Chairperson of the Board since 2016 and Trustee since 2003.	Private investor. Formerly, Consultant (management and transactional) (2012-2014). Formerly, Chief Financial Officer, Aveon Group L.P. (investment management firm) (2010-2011). Formerly, Vice Chairman, Commercial Industrial Finance Corp. (specialty finance company) (2006-2010). Formerly, President and Chief Executive Officer, Prizm Capital Management, LLC (investment management firm) (2002-2005). Formerly, Executive Vice President and Chief Financial Officer, United Asset Management Corporation (investment management firm) (1982-2001). Formerly, Senior Manager, Price Waterhouse (now PricewaterhouseCoopers) (a registered public accounting firm) (1972-1981). Directorships in the Last Five Years.(2) None.

24

Eaton Vance

High Income 2021 Target Term Trust

March 31, 2018

Management and Organization — continued

Name and Year of Birth	Position(s) with the Trust	Term Expiring; Trustee  Since(1)	Principal Occupation(s) and Directorships During Past Five Years and Other Relevant Experience
Noninterested Trustees (continued)
Helen Frame Peters 1948	Class III Trustee	Until 2019. Trustee since 2008.	Professor of Finance, Carroll School of Management, Boston College. Formerly, Dean, Carroll School of Management, Boston College (2000-2002). Formerly, Chief Investment Officer, Fixed Income, Scudder Kemper Investments (investment management firm) (1998-1999). Formerly, Chief Investment Officer, Equity and Fixed Income, Colonial Management Associates (investment management firm) (1991-1998). Directorships in the Last Five Years.(2) None.
Susan J. Sutherland 1957	Class III Trustee	Until 2019. Trustee since 2015.	Private investor. Formerly, Associate, Counsel and Partner at Skadden, Arps, Slate, Meagher & Flom LLP (law firm) (1982-2013). Directorships in the Last Five Years. Formerly, Director of Montpelier Re Holdings Ltd. (global provider of customized insurance and reinsurance products) (2013-2015).
Harriett Tee Taggart 1948	Class III Trustee	Until 2019. Trustee since 2011.	Managing Director, Taggart Associates (a professional practice firm). Formerly, Partner and Senior Vice President, Wellington Management Company, LLP (investment management firm) (1983-2006). Ms. Taggart has apprised the Board of Trustees that she intends to retire as a Trustee of all Eaton Vance Funds in 2018. Directorships in the Last Five Years.(2) Director of Albemarle Corporation (chemicals manufacturer) (since 2007) and The Hanover Group (specialty property and casualty insurance company) (since 2009).
Scott E. Wennerholm 1959	Class I Trustee	Until 2020. Trustee since 2016.	Trustee at Wheelock College (postsecondary institution) (since 2012). Formerly, Consultant at GF Parish Group (executive recruiting firm) (2016-2017). Formerly, Chief Operating Officer and Executive Vice President at BNY Mellon Asset Management (investment management firm) (2005-2011). Formerly, Chief Operating Officer and Chief Financial Officer at Natixis Global Asset Management (investment management firm) (1997-2004). Formerly, Vice President at Fidelity Investments Institutional Services (investment management firm) (1994-1997). Directorships in the Last Five Years. None

Name and Year of Birth	Position(s) with the Trust	Officer Since(3)	Principal Occupation(s) During Past Five Years
Principal Officers who are not Trustees
Payson F. Swaffield 1956	President	2003	Vice President and Chief Income Investment Officer of EVM and BMR. Also Vice President of Calvert Research and Management (“CRM”).
Maureen A. Gemma 1960	Vice President, Secretary and Chief Legal Officer	2005	Vice President of EVM and BMR. Also Vice President of CRM.
James F. Kirchner 1967	Treasurer	2007	Vice President of EVM and BMR. Also Vice President of CRM.
Richard F. Froio 1968	Chief Compliance Officer	2017	Vice President of EVM and BMR since 2017. Formerly Deputy Chief Compliance Officer (Adviser/Funds) and Chief Compliance Officer (Distribution) at PIMCO (2012-2017) and Managing Director at BlackRock/Barclays Global Investors (2009-2012).

⁽¹⁾  Year first appointed to serve as Trustee for a fund in the Eaton Vance family of funds. Each Trustee has served continuously since appointment unless indicated otherwise. Each Trustee holds office until the annual meeting for the year in which his or her term expires and until his or her successor is elected and qualified, subject to a prior death, resignation, retirement, disqualification or removal.

⁽²⁾  During their respective tenures, the Trustees (except for Mmes. Frost and Sutherland and Messrs. Fetting, Gorman and Wennerholm) also served as Board members of one or more of the following funds (which operated in the years noted): eUnits^TM 2 Year U.S. Market Participation Trust: Upside to Cap / Buffered Downside (launched in 2012 and terminated in 2014); and eUnits^TM 2 Year U.S. Market Participation Trust II: Upside to Cap / Buffered Downside (launched in 2012 and terminated in 2014). However, Ms. Mosley did not serve as a Board member of eUnits^TM 2 Year U.S. Market Participation Trust: Upside to Cap / Buffered Downside (launched in 2012 and terminated in 2014).

⁽³⁾  Year first elected to serve as officer of a fund in the Eaton Vance family of funds when the officer has served continuously. Otherwise, year of most recent election as an officer of a fund in the Eaton Vance family of funds. Titles may have changed since initial election.

25

Eaton Vance Funds

IMPORTANT NOTICES

Privacy. The Eaton Vance organization is committed to ensuring your financial privacy. Each of the financial institutions identified below has in effect the following policy (“Privacy Policy”) with respect to nonpublic personal information about its customers:

• Only such information received from you, through application forms or otherwise, and information about your Eaton Vance fund transactions will be collected. This may include information such as name, address, social security number, tax status, account balances and transactions.

• None of such information about you (or former customers) will be disclosed to anyone, except as permitted by law (which includes disclosure to employees necessary to service your account). In the normal course of servicing a customer’s account, Eaton Vance may share information with unaffiliated third parties that perform various required services such as transfer agents, custodians and broker-dealers.

• Policies and procedures (including physical, electronic and procedural safeguards) are in place that are designed to protect the confidentiality of such information.

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

Our pledge of privacy 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 Ltd., Eaton Vance Management’s Real Estate Investment Group and Boston Management and Research. In addition, our Privacy Policy applies only to those Eaton Vance customers who are individuals and who have a direct relationship with us. If a customer’s account (i.e., fund shares) is held in the name of a third-party financial advisor/broker-dealer, it is likely that only such advisor’s privacy policies apply to the customer. This notice supersedes all previously issued privacy disclosures. For more information about Eaton Vance’s Privacy Policy, 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. American Stock Transfer & Trust Company, LLC (“AST”), the closed-end funds transfer agent, or your financial advisor, may household the mailing of your documents indefinitely unless you instruct AST, or your financial advisor, otherwise. If you would prefer that your Eaton Vance documents not be householded, please contact AST or your financial advisor. Your instructions that householding not apply to delivery of your Eaton Vance documents will typically be effective within 30 days of receipt by AST or your financial advisor.

Portfolio Holdings. Each Eaton Vance Fund and its underlying Portfolio(s) (if applicable) will file a schedule of portfolio holdings on Form N-Q with the SEC for the first and third quarters of each fiscal year. The Form N-Q 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. Form N-Q may also be reviewed and copied at the SEC’s public reference room in Washington, D.C. (call 1-800-732-0330 for information on the operation of the public reference room).

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.

Additional Notice to Shareholders. If applicable, a Fund may also redeem or purchase its outstanding preferred shares in order to maintain compliance with regulatory requirements, borrowing or rating agency requirements or for other purposes as it deems appropriate or necessary.

Closed-End Fund Information. Eaton Vance closed-end funds make fund performance data and certain information about portfolio characteristics available on the Eaton Vance website shortly after the end of each month. Other information about the funds is available on the website. The funds’ net asset value per share is readily accessible on the Eaton Vance website. Portfolio holdings for the most recent month-end are also posted to the website approximately 30 days following the end of the month. This information is available at www.eatonvance.com on the fund information pages under “Individual Investors — Closed-End Funds”.

26

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Investment Adviser and Administrator

Eaton Vance Management

Two International Place

Boston, MA 02110

Custodian

State Street Bank and Trust Company

State Street Financial Center, One Lincoln Street

Boston, MA 02111

Transfer Agent

American Stock Transfer & Trust Company, LLC

6201 15^th Avenue

Brooklyn, NY 11219

Independent Registered Public Accounting Firm

Deloitte & Touche LLP

200 Berkeley Street

Boston, MA 02116-5022

Fund Offices

Two International Place

Boston, MA 02110

23363    3.31.18

Item 2. Code of Ethics

The registrant has adopted a code of ethics applicable to its Principal Executive Officer, Principal Financial Officer and Principal Accounting Officer. The registrant undertakes to provide a copy of such code of ethics to any person upon request, without charge, by calling 1-800-262-1122. The registrant has not amended the code of ethics as described in Form N-CSR during the period. The registrant has not granted any waiver, including an implicit waiver, from a provision of the code of ethics as described in Form N-CSR during the period covered by this report.

Item 3. Audit Committee Financial Expert

The registrant’s Board has designated William H. Park, an independent trustee, as its audit committee financial expert. Mr. Park is a certified public accountant who is a private investor. Previously, he served as a consultant, as the Chief Financial Officer of Aveon Group, L.P. (an investment management firm), as the Vice Chairman of Commercial Industrial Finance Corp. (specialty finance company), as President and Chief Executive Officer of Prizm Capital Management, LLC (investment management firm), as Executive Vice President and Chief Financial Officer of United Asset Management Corporation (an institutional investment management firm) and as a Senior Manager at Price Waterhouse (now PricewaterhouseCoopers) (an independent registered public accounting firm).

Item 4. Principal Accountant Fees and Services

(a)-(d)

The following table presents the aggregate fees billed to the registrant for the fiscal periods ending March 31, 2017 to March 31, 2018 by D&T for professional services rendered for the audit of the registrant’s annual financial statements and fees billed for other services rendered by D&T during such period.

Fiscal Period Ended*	3/31/17		3/31/18
Audit Fees	$	40,000	$	35,725
Audit-Related Fees(1)	$	10,000	$	0
Tax Fees(2)	$	11,000	$	11,165
All Other Fees(3)	$	0	$	0
Total	$	61,000	$	46,890

* The table presents the aggregate fees billed to the Fund for the Fund’s fiscal period from May 25, 2016 (commencement of operations) to March 31, 2018.

⁽¹⁾  Audit-related fees consist of the aggregate fees billed for assurance and related services that are reasonably related to the performance of the audit of financial statements and are not reported under the category of audit fees and specifically include fees related to comfort letter and bring down letters in conjunction with the initial public offering.

⁽²⁾  Tax fees consist of the aggregate fees billed for professional services rendered by the principal accountant relating to tax compliance, tax advice, and tax planning and specifically include fees for tax return preparation and other related tax compliance/planning matters.

⁽³⁾  All other fees consist of the aggregate fees billed for products and services provided by the principal accountant other than audit, audit-related, and tax services.

(e)(1) The registrant’s audit committee has adopted policies and procedures relating to the pre-approval of services provided by the registrant’s principal accountant (the “Pre-Approval Policies”). The Pre-Approval Policies establish a framework intended to assist the audit committee in the proper discharge of its pre-approval responsibilities. As a general matter, the Pre-Approval Policies (i) specify certain types of audit, audit-related, tax, and other services determined to be pre-approved by the audit committee; and (ii) delineate specific procedures governing the mechanics of the pre-approval process, including the approval and monitoring of audit and non-audit service fees. Unless a service is specifically pre-approved under the Pre-Approval Policies, it must be separately pre-approved by the audit committee.

The Pre-Approval Policies and the types of audit and non-audit services pre-approved therein must be reviewed and ratified by the registrant’s audit committee at least annually. The registrant’s audit committee maintains full responsibility for the appointment, compensation, and oversight of the work of the registrant’s principal accountant.

(e)(2) No services described in paragraphs (b)-(d) above were approved by the registrant’s audit committee pursuant to the “de minimis exception” set forth in Rule 2-01(c)(7)(i)(C) of Regulation S-X.

(f) Not applicable.

(g) The following table presents (i) the aggregate non-audit fees (i.e., fees for audit-related, tax, and other services) billed to the registrant by D&T for the fiscal periods ending March 31, 2017 to March 31, 2018; and (ii) the aggregate non-audit fees (i.e., fees for audit-related, tax, and other services) billed to the Eaton Vance organization by D&T for the same time periods.

Fiscal Period Ended*	3/31/17		3/31/18
Registrant	$	21,000	$	11,165
Eaton Vance(1)	$	46,000	$	155,208

* The table presents the aggregate fees billed to the Fund for the Fund’s fiscal period from May 25, 2016 (commencement of operations) to March 31, 2018.

⁽¹⁾  Eaton Vance Management, a subsidiary of Eaton Vance Corp., acts as the registrant’s investment adviser and administrator.

(h) The registrant’s audit committee has considered whether the provision by the registrant’s principal accountant of non-audit services to the registrant’s investment adviser and any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant that were not pre-approved pursuant to Rule 2-01(c)(7)(ii) of Regulation S-X is compatible with maintaining the principal accountant’s independence.

Item 5. Audit Committee of Listed Registrants

The registrant has a separately-designated standing audit committee established in accordance with Section 3(a)(58)(A) of the Securities and Exchange Act of 1934, as amended. George J. Gorman (Chair), Valerie A. Mosley, William H. Park and Scott E. Wennerholm are the members of the registrant’s audit committee.

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

The Board of Trustees of the Trust has adopted a proxy voting policy and procedure (the “Fund Policy”), pursuant to which the Trustees have delegated proxy voting responsibility to the Fund’s investment adviser and adopted the investment adviser’s proxy voting policies and procedures (the “Policies”) which are described below. The Trustees will review the Fund’s proxy voting records from time to time and will annually consider approving the Policies for the upcoming year. In the event that a conflict of interest arises between the Fund’s shareholders and the investment adviser, the administrator, or any of their affiliates or any affiliate of the Fund, the investment adviser will generally refrain from voting the proxies related to the companies giving rise to such conflict until it consults with the Board’s Special Committee except as contemplated under the Fund Policy. The Board’s Special Committee will instruct the investment adviser on the appropriate course of action.

The Policies are designed to promote accountability of a company’s management to its shareholders and to align the interests of management with those shareholders. An independent proxy voting service (“Agent”), currently Institutional Shareholder Services, Inc., has been retained to assist in the voting of proxies through the provision of vote analysis, implementation and recordkeeping and disclosure services. The investment adviser will generally vote proxies through the Agent. The Agent is required to vote all proxies and/or refer them back to the investment adviser pursuant to the Policies. It is generally the policy of the investment adviser to vote in accordance with the recommendation of the Agent. The Agent shall refer to the investment adviser proxies

relating to mergers and restructurings, and the disposition of assets, termination, liquidation and mergers contained in mutual fund proxies. The investment adviser will normally vote against anti-takeover measures and other proposals designed to limit the ability of shareholders to act on possible transactions, except in the case of closed-end management investment companies. The investment adviser generally supports management on social and environmental proposals. The investment adviser may abstain from voting from time to time where it determines that the costs associated with voting a proxy outweighs the benefits derived from exercising the right to vote or the economic effect on shareholders interests or the value of the portfolio holding is indeterminable or insignificant.

In addition, the investment adviser will monitor situations that may result in a conflict of interest between the Fund’s shareholders and the investment adviser, the administrator, or any of their affiliates or any affiliate of the Fund by maintaining a list of significant existing and prospective corporate clients. The investment adviser’s personnel responsible for reviewing and voting proxies on behalf of the Fund will report any proxy received or expected to be received from a company included on that list to the personnel of the investment adviser identified in the Policies. If such personnel expects to instruct the Agent to vote such proxies in a manner inconsistent with the guidelines of the Policies or the recommendation of the Agent, the personnel will consult with members of senior management of the investment adviser to determine if a material conflict of interests exists. If it is determined that a material conflict does exist, the investment adviser will seek instruction on how to vote from the Special Committee.

Information on how the Fund voted proxies relating to portfolio securities during the most recent 12 month period ended June 30 is available (1) without charge, upon request, by calling 1-800-262-1122, and (2) on the Securities and Exchange Commission’s website at http://www.sec.gov.

Item 8. Portfolio Managers of Closed-End Management Investment Companies

Eaton Vance Management (“EVM” or “Eaton Vance”) is the investment adviser of the Trust. Kelley G. Baccei, Stephen C. Concannon and Michael W. Weilheimer comprise the investment team responsible for the overall management of the Trust’s investments.

Ms. Baccei is a Vice President of EVM and has been a portfolio manager of the Trust since May 2016. Mr. Concannon is a Vice President of EVM and has been a portfolio manager of the Trust since May 2016. Mr. Weilheimer is a Vice President of EVM, has been a portfolio manager of the Trust since May 2016 and is Director of EVM’s High Yield Investments Group. Messrs. Concannon and Weilheimer have managed other Eaton Vance portfolios for more than five years. This information is provided as of the date of filing this report.

The following table shows, as of the Trust’s most recent fiscal year end, the number of accounts each portfolio manager managed in each of the listed categories and the total assets (in millions of dollars) in the accounts managed within each category. The table also shows the number of accounts with respect to which the advisory fee is based on the performance of the account, if any, and the total assets (in millions of dollars) in those accounts.

	Number of All Accounts		Total Assets of All Accounts		Number of Accounts Paying a Performance Fee		Total Assets of Accounts Paying a Performance Fee
Kelley G. Baccei
Registered Investment Companies		2	$	1,929.6		0	$	0

	Number of All Accounts		Total Assets of All Accounts		Number of Accounts Paying a Performance Fee		Total Assets of Accounts Paying a Performance Fee
Other Pooled Investment Vehicles		1	$	211.2		0	$	0
Other Accounts		0	$	0		0	$	0
Stephen C. Concannon
Registered Investment Companies		3	$	6,904.4		0	$	0
Other Pooled Investment Vehicles		0	$	0		0	$	0
Other Accounts		0	$	0		0	$	0
Michael W. Weilheimer
Registered Investment Companies		7	$	9,971.4		0	$	0
Other Pooled Investment Vehicles		3	$	581.7		0	$	0
Other Accounts		21	$	4,165.1		0	$	0

The following table shows the dollar range of Trust shares beneficially owned by each portfolio manager as of the Trust’s most recent fiscal year end.

Portfolio Manager	Dollar Range of Equity Securities Beneficially Owned in the Trust
Kelley G. Baccei	None
Stephen C. Concannon	None
Michael W. Weilheimer	None

Potential for Conflicts of Interest. It is possible that conflicts of interest may arise in connection with a portfolio manager’s management of the Trust’s investments on the one hand and the investments of other accounts for which a portfolio manager is responsible on the other. For example, a portfolio manager may have conflicts of interest in allocating management time, resources and investment opportunities among the Trust and other accounts he or she advises. In addition, due to differences in the investment strategies or restrictions between the Trust and the other accounts, the portfolio manager may take action with respect to another account that differs from the action taken with respect to the Trust. In some cases, another account managed by a portfolio manager may compensate the investment adviser based on the performance of the securities held by that account. The existence of such a performance based fee may create additional conflicts of interest for the portfolio manager in the allocation of management time, resources and investment opportunities. Whenever conflicts of interest arise, the portfolio manager will endeavor to exercise his or her discretion in a manner that he or she believes is equitable to all interested persons. EVM has adopted several policies and procedures designed to address these potential conflicts including a code of ethics and policies that govern the investment adviser’s trading practices, including among other things the aggregation and allocation of trades among clients, brokerage allocations, cross trades and best execution.

Compensation Structure for EVM

Compensation of EVM’s portfolio managers and other investment professionals has three primary components: (1) a base salary, (2) an annual cash bonus, and (3) annual non-cash compensation consisting of options to purchase shares of Eaton Vance Corp. (“EVC”) nonvoting common stock and/or restricted shares of EVC nonvoting common stock that generally are subject to a vesting schedule, and (4) (for equity portfolio managers) a Deferred Alpha Incentive Plan, which pays a deferred cash award tied to future excess returns in certain equity strategy portfolios. EVM’s investment professionals also receive certain retirement, insurance and other benefits that are broadly available to EVM’s employees. Compensation of EVM’s investment professionals is reviewed primarily on an annual basis. Cash bonuses, stock-based compensation awards, and adjustments in base salary are typically paid or put into effect at or shortly after the October 31st fiscal year end of EVC.

Method to Determine Compensation. EVM compensates its portfolio managers based primarily on the scale and complexity of their portfolio responsibilities and the total return performance of managed funds and accounts versus the benchmark(s) stated in the prospectus, as well as an appropriate peer group (as described below). In addition to rankings within peer groups of funds on the basis of absolute performance, consideration may also be given to relative risk-adjusted performance. Risk-adjusted performance measures include, but are not limited to, the Sharpe ratio (Sharpe ratio uses standard deviation and excess return to determine reward per unit of risk). Performance is normally based on periods ending on the September 30th preceding fiscal year end. Fund performance is normally evaluated primarily versus peer groups of funds as determined by Lipper Inc. and/or Morningstar, Inc. When a fund’s peer group as determined by Lipper or Morningstar is deemed by EVM’s management not to provide a fair comparison, performance may instead be evaluated primarily against a custom peer group or market index. In evaluating the performance of a fund and its manager, primary emphasis is normally placed on three-year performance, with secondary consideration of performance over longer and shorter periods. A portion of the compensation payable to equity portfolio managers and investment professionals will be determined based on the ability of one or more accounts managed by such manager to achieve a specified target average annual gross return over a three year period in excess of the account benchmark. The cash bonus to be payable at the end of the three year term will be established at the inception of the term and will be adjusted positively or negatively to the extent that the average annual gross return varies from the specified target return. For funds that are tax-managed or otherwise have an objective of after-tax returns, performance is measured net of taxes. For other funds, performance is evaluated on a pre-tax basis. For funds with an investment objective other than total return (such as current income), consideration will also be given to the fund’s success in achieving its objective. For managers responsible for multiple funds and accounts, investment performance is evaluated on an aggregate basis, based on averages or weighted averages among managed funds and accounts. Funds and accounts that have performance-based advisory fees are not accorded disproportionate weightings in measuring aggregate portfolio manager performance.

The compensation of portfolio managers with other job responsibilities (such as heading an investment group or providing analytical support to other portfolios) will include consideration of the scope of such responsibilities and the managers’ performance in meeting them.

EVM seeks to compensate portfolio managers commensurate with their responsibilities and performance, and competitive with other firms within the investment management industry. EVM participates in investment-industry compensation surveys and utilizes survey data as a factor in determining salary, bonus and stock-based compensation levels for portfolio managers and other investment professionals. Salaries, bonuses and stock-based compensation are also influenced by the operating performance of EVM and its parent company. The overall annual cash bonus pool is generally based on a substantially fixed percentage of pre-bonus adjusted operating income. While the salaries of EVM’s portfolio managers are comparatively fixed, cash bonuses and stock-based compensation may fluctuate significantly from year to year, based on changes in manager performance and other factors as described herein. For a high performing portfolio manager, cash bonuses and stock-based compensation may represent a substantial portion of total compensation.

Item 9. Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers

No such purchases this period.

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 second fiscal quarter of the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

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.

Eaton Vance High Income 2021 Target Term Trust

By:	/s/ Payson F. Swaffield
	Payson F. Swaffield
	President
Date:	May 24, 2018

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:	May 24, 2018
By:	/s/ Payson F. Swaffield
	Payson F. Swaffield
	President
Date:	May 24, 2018

EX-99.CERT

Eaton Vance High Income 2021 Target Term Trust

FORM N-CSR

Exhibit 13(a)(2)(i)

CERTIFICATION

I, James F. Kirchner, certify that:

1. I have reviewed this report on Form N-CSR of Eaton Vance High Income 2021 Target Term Trust;

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

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

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

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

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

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and

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

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

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

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

Date:	May 24, 2018	/s/ James F. Kirchner
		James F. Kirchner
		Treasurer

Eaton Vance High Income 2021 Target Term Trust

FORM N-CSR

Exhibit 13(a)(2)(ii)

CERTIFICATION

I, Payson F. Swaffield, certify that:

1. I have reviewed this report on Form N-CSR of Eaton Vance High Income 2021 Target Term Trust;

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

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

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

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

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

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and

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

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

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

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

Date:	May 24, 2018	/s/ Payson F. Swaffield
		Payson F. Swaffield
		President

EX-99.906CERT

Form N-CSR Item 13(b) Exhibit

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned hereby certify in their capacity as Treasurer and President, respectively, of Eaton Vance High Income 2021 Target Term Trust (the “Trust”), that:

(a) The Annual Report of the Trust on Form N-CSR for the period ended March 31, 2018 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(b) The information contained in the Report fairly presents, in all material respects, the financial condition and the results of operations of the Trust for such period.

A signed original of this written statement required by section 906 has been provided to the Trust and will be retained by the Trust and furnished to the Securities and Exchange Commission or its staff upon request.

Eaton Vance High Income 2021 Target Term Trust

Date: May 24, 2018

/s/ James F. Kirchner

James F. Kirchner

Treasurer

Date: May 24, 2018

/s/ Payson F. Swaffield

Payson F. Swaffield

President