Eaton Vance Senior Income Trust Report of Earnings

BOSTON, May 09, 2008 (BUSINESS WIRE) ----Eaton Vance Senior Income Trust (NYSE: EVF), (the" Trust"), a closed-end management investment company, today announced the earnings of the Trust for the three and nine months ended March 31, 2008. The Trust's fiscal year ends on June 30, 2008.

For the three months ended March 31, 2008, the Trust had net investment income of $6,737,943 ($0.185 per common share). From this amount, the Trust paid dividends on preferred shares of $1,104,070 (equal to $0.030 for each common share), resulting in net investment income after preferred dividends of $5,633,873 or $0.155 per common share. For the nine months ended March 31, 2008, the Trust had net investment income of $21,601,635 ($0.592 per common share). From this amount, the Trust paid dividends on preferred shares of $4,097,013 (equal to $0.112 per common share), resulting in net investment income after preferred dividends of $17,504,622, or $0.480 per common share. In comparison, for the three months ended March 31, 2007, the Trust had net investment income of $7,174,816 ($0.197 per common share). From this amount, the Trust paid dividends on preferred shares of $1,362,081 (equal to $0.037 for each common share), resulting in net investment income after preferred dividends of $5,812,735 or $0.160 per common share. For the nine months ended March 31, 2007, the Trust had net investment income of $22,122,188 ($0.607 per common share). From this amount, the Trust paid dividends on preferred shares of $4,176,120 (equal to $0.115 per common share), resulting in net investment income after preferred dividends of $17,946,068, or $0.492 per common share.

Net realized and unrealized losses for the three months ended March 31, 2008 were $33,372,761 ($0.915 per common share). The Trust's net realized and unrealized losses for the nine months ended March 31, 2008 were $61,519,299 ($1.687 per common share). In comparison, net realized and unrealized gains for the three months ended March 31, 2007 were $1,662,421 ($0.046 per common share). The Trust's net realized and unrealized gains for the nine months ended March 31, 2007 were $3,590,410 ($0.098 per common share).

On March 31, 2008, net assets of the Trust applicable to common shares were $257,537,321. The net asset value per common share on March 31, 2008 was $7.06 based on 36,466,497 shares outstanding. In comparison, on March 31, 2007, net assets of the Trust applicable to common shares were $322,500,884. The net asset value per common share on March 31, 2007 was $8.84 based on 36,466,497 shares outstanding.

The Trust 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 $150.9 billion in assets under management on March 31, 2008. Eaton Vance will make available periodic summary information regarding the Trust's portfolio of 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 Ended Nine Months Ended
   March 31, March 31, -------------------- -------------------- 2008 2007 2008 2007 ---------- --------- ---------- ---------
   Gross investment income $ 9,505 $ 10,606 $ 31,099 $ 32,607 Interest expense (1,232) (1,678) (4,598) (5,224) Operating expenses
   (1,535) (1,753) (4,899) (5,261) ---------- --------- ---------- --------- Net investment income $ 6,738 $ 7,175 $ 21,602 $
   22,122 Net realized and unrealized gains (losses) on investments ($33,373) $ 1,662 ($61,519) $ 3,590 Preferred dividends paid
   ($1,104) ($1,362) ($4,097) ($4,176) ---------- --------- ---------- --------- Net increase (decrease) in net assets from operations
   ($27,739) $ 7,475 ($44,014) $ 21,536 ========== ========= ========== ========= Earnings per Common Share Outstanding -----------------------------
   Gross investment income $ 0.261 $ 0.291 $ 0.852 $ 0.894 Interest expense (0.034) (0.046) (0.126) (0.143) Operating expenses
   (0.042) (0.048) (0.134) (0.144) ---------- --------- ---------- --------- Net investment income $ 0.185 $ 0.197 $ 0.592 $
   0.607 Net realized and unrealized gains (losses) on investments ($0.915) $ 0.046 ($1.687) $ 0.098 Preferred dividends paid
   (0.030) (0.037) (0.112) (0.115) ---------- --------- ---------- --------- Net increase (decrease) in net assets from operations
   ($0.760) $ 0.206 ($1.207) $ 0.590 ========== ========= ========== ========= Net investment income $ 0.185 $ 0.197 $ 0.592
   $ 0.607 Preferred dividends paid (0.030) (0.037) (0.112) (0.115) ---------- --------- ---------- --------- Net investment
   income after preferred dividends $ 0.155 $ 0.160 $ 0.480 $ 0.492 ========== ========= ========== ========= Net Asset Value
   at March 31 (Common Shares ) ----------------------------- Net assets (000) $ 257,537 $322,501 Shares outstanding (000) 36,466
   36,466 Net asset value per share outstanding $ 7.06 $ 8.84 Market Value Summary ---------------------------- Market price
   on NYSE at March 31 $ 6.45 $ 8.78 High market price (nine months ended March 31) $ 8.62 $ 8.86 Low market price (nine months
   ended March 31) $ 6.26 $ 8.00 

SOURCE: Eaton Vance Senior Income Trust

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

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