Company: EVF
Filing Date: 2025-05-01
Form Type: 424B3
Source: 0001076598-25-000099
Chunk: 0

Company: Eaton Vance Senior Income Trust
Filing Date: 2025-05-01
Form: 424B3
Chunk 0
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| Filed pursuant to Rule 424(b)(3)                                      
 File Nos. 333-265180, 333-263033, 333-265889, 333-266343, 333-269206, 
 333-284330                                                            |

<div align='center'>EATON VANCE NATIONAL MUNICIPAL OPPORTUNITIES TRUST

Supplement to Statement of Additional Information (“SAI”)
dated July 28, 2022

as may be supplemented and/or revised from time to time

EATON VANCE SENIOR INCOME TRUST

Supplement to SAI dated August 25, 2022

as may be supplemented and/or revised from time to time

EATON VANCE FLOATING-RATE INCOME TRUST

Supplement to SAI dated September 27, 2022

as may be supplemented and/or revised from time to time

EATON VANCE SENIOR FLOATING-RATE TRUST

Supplement to SAI dated March 31, 2023

as may be supplemented and/or revised from time to time

EATON VANCE MUNICIPAL INCOME TRUST

Supplement to SAI dated May 10, 2023

as may be supplemented and/or revised from time to time

EATON VANCE ENHANCED EQUITY INCOME FUND

Supplement to SAI dated January 17, 2025

as may be supplemented and/or revised from time to time</div>

1. The following replaces “Proxy Voting Policy.” under “Trustees and Officers”:

Proxy Voting Policy. The Board adopted a proxy voting
policy and procedures (the “Fund Policy”), pursuant to which the Board has delegated proxy voting responsibility to the Adviser
and adopted the proxy voting policies and procedures of the Adviser (the “Adviser Policies”). An independent proxy voting
service has been retained to assist in the voting of Fund proxies through the provision of research, execution, recordkeeping and reporting
services. The members of the Board will review the Fund’s proxy voting records from time to time and will review annually the Adviser
Policies. For a copy of the Fund Policy and the Adviser Policies, see Appendix A, B and C, respectively. Pursuant to certain provisions
of the 1940 Act relating to funds investing in other funds, a Fund may be required or may elect to vote its interest in another fund in
the same proportion as the holders