Eaton Vance Senior Income Trust Report of Earnings

Eaton Vance Senior Income Trust (NYSE: EVF), (the Fund), a closed-end management investment company, today announced the earnings of the Fund for the three and six months ended December 31, 2007. The Funds fiscal year ends on June 30, 2008.

For the three months ended December 31, 2007, the Fund had net investment income of $7,483,993 ($0.206 per common share). From this amount, the Fund paid dividends on preferred shares of $1,449,090 (equal to $0.040 for each common share), resulting in net investment income after preferred dividends of $6,034,903 or $0.166 per common share. For the six months ended December 31, 2007, the Fund had net investment income of $14,863,692 ($0.408 per common share). From this amount, the Fund paid dividends on preferred shares of $2,992,943 (equal to $0.082 per common share), resulting in net investment income after preferred dividends of $11,870,749, or $0.326 per common share. In comparison, for the three months ended December 31, 2006, the Fund had net investment income of $7,593,405 ($0.208 per common share). From this amount, the Fund paid dividends on preferred shares of $1,422,926 (equal to $0.039 for each common share), resulting in net investment income after preferred dividends of $6,170,479 or $0.169 per common share. For the six months ended December 31, 2006, the Fund had net investment income of $14,947,372 ($0.410 per common share). From this amount, the Fund paid dividends on preferred shares of $2,814,039 (equal to $0.077 per common share), resulting in net investment income after preferred dividends of $12,133,333, or $0.333 per common share.

Net realized and unrealized losses for the three months ended December 31, 2007 were $10,270,941 ($0.333 per common share). The Funds net realized and unrealized losses for the six months ended December 31, 2007 were $28,146,538 ($0.823 per common share). In comparison, net realized and unrealized gains for the three months ended December 31, 2006 were $1,721,800 ($0.047 per common share). The Funds net realized and unrealized gains for the six months ended December 31, 2006 were $1,927,991 ($0.057 per common share).

On December 31, 2007, net assets of the Fund applicable to common shares were $291,356,734. The net asset value per common share on December 31, 2007 was $7.99 based on 36,466,497 shares outstanding. In comparison, on December 31, 2006, net assets of the Fund applicable to common shares were $319,075,203. The net asset value per common share on December 31, 2006 was $8.75 based on 36,466,497 shares outstanding.

The Fund is managed by Eaton Vance Management, a subsidiary of Eaton Vance Corp., which is listed on the New York Stock Exchange under the symbol EV. Eaton Vance and its affiliates had $158.5 billion in assets under management on December 31, 2007. Eaton Vance will make available periodic summary information regarding the Funds portfolio investments. Those interested should call Eaton Vance Management at (800)-262-1122.

EATON VANCE SENIOR INCOME TRUST
SUMMARY OF RESULTS OF OPERATIONS
(in thousands, except per share amounts)
Three Months EndedSix Months Ended
December 31,December 31,
2007200620072006
Gross investment income $10,712 $11,105 $21,594 $22,001
Interest expense (1,739 ) (1,771 ) (3,367 ) (3,546 )
Operating expenses (1,489)(1,741)(3,363)(3,508)
Net investment income $7,484 $7,593 $14,864 $14,947

Net realized and unrealized gains (losses) on investments

($10,271 ) $1,722 ($28,147 ) $1,928
Preferred dividends paid ($1,449)($1,423)($2,993)($2,814)

Net increase (decrease) in net assets from operations

($4,236)$7,892($16,276)$14,061
Earnings per Common Share Outstanding
Gross investment income $0.294 $0.305 $0.592 $0.603
Interest expense (0.047 ) (0.049 ) (0.092 ) (0.097 )
Operating expenses (0.041)(0.048)(0.092)(0.096)
Net investment income $0.206 $0.208 $0.408 $0.410

Net realized and unrealized gains (losses) on investments

($0.333 ) $0.047 ($0.823 ) $0.057
Preferred dividends paid (0.040)(0.039)(0.082)(0.077)

Net increase (decrease) in net assets from operations

($0.167)$0.216($0.497)$0.390
Net investment income $0.206 $0.208 $0.408 $0.410
Preferred dividends paid (0.040)(0.039)(0.082)(0.077)
Net investment income after preferred dividends $0.166$0.169$0.326$0.333

Net Asset Value at December 31 (Common Shares)

Net assets (000) $291,357 $319,075
Shares outstanding (000) 36,466 36,466
Net asset value per share outstanding $7.99 $8.75
Market Value Summary
Market price on NYSE at December 31 $7.12 $8.31
High market price (six months ended December 31) $8.62 $8.36
Low market price (six months ended December 31) $6.95 $8.00

Contacts:

Eaton Vance Senior Income Trust
Investor Contact: 800-262-1122

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