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-month period and nine month period ended March 31, 2007. The Fund’s fiscal year ends on June 30, 2007.

For the three months ended March 31, 2007, the Fund had net investment income of $7,174,816 ($0.197 per common share). From this amount, the Fund 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 Fund had net investment income of $22,122,188 ($0.607 per common share). From this amount, the Fund 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. In comparison, for the three months ended March 31, 2006, the Fund had net investment income of $6,496,002 ($0.178 per common share). From this amount, the Fund paid dividends on preferred shares of $1,145,883 (equal to $0.031 for each common share), resulting in net investment income after preferred dividends of $5,350,119 or $0.147 per common share. For the nine months ended March 31, 2006, the Fund had net investment income of $18,525,379 ($0.508 per common share). From this amount, the Fund paid dividends on preferred shares of $3,125,075 (equal to $0.086 per common share), resulting in net investment income after preferred dividends of $15,400,304, or $0.422 per common share.

Net realized and unrealized gains for the three months ended March 31, 2007 were $1,662,421 ($0.046 per common share). The Fund’s net realized and unrealized gains for the nine months ended March 31, 2007 were $3,590,410 ($0.098 per common share). In comparison, net realized and unrealized gains for the three months ended March 31, 2006 were $3,044,771 ($0.083 per common share). The Fund’s net realized and unrealized gains for the nine months ended March 31, 2006 were $2,636,718 ($0.072 per common share).

On March 31, 2007, net assets of the Fund 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. In comparison, on March 31, 2006, net assets of the Fund applicable to common shares were $322,344,152. The net asset value per common share on March 31, 2006 was $8.84 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 $150.0 billion in assets under management on April 30, 2007. Eaton Vance will make available periodic summary information regarding the Fund’s portfolio investments. Those interested should call Eaton Vance Management at 800-262-1122.