MFS CHARTER INCOME TRUST

This Proxy Statement is furnished in connection with the solicitation of proxies by and on behalf of the Board of Trustees of MFS Charter Income Trust, MFS Government Markets Income Trust, MFS High Income Municipal Trust, MFS High Yield Municipal Trust, MFS Intermediate High Income Fund, MFS Intermediate Income Trust, MFS Investment Grade Municipal Trust, MFS Multimarket Income Trust, and MFS Municipal Income Trust, (each, a “Trust” and collectively, the “Trusts”) to be used at the Meeting of Shareholders of each Trust (each, a “Meeting”) to be held at 10:30 a.m. (Eastern Time) on Thursday, October 2, 2025, at 111 Huntington Avenue, Boston, Massachusetts 02199, for the purposes set forth in the accompanying Notice of the 2025 Annual Meeting of Shareholders (the “Notice”). Information regarding the Board of Trustees can be found in the section of this Proxy Statement entitled “Election of Trustees.” If the enclosed form of proxy is executed and returned, it may nevertheless be revoked prior to its exercise by a signed writing filed with the proxy tabulation agent, Computershare Trust Company, N.A. (“Computershare”), c/o Proxy Tabulator, PO Box 43131, Providence RI, 02940-3131, or delivered at a Meeting.

On July 31, 2025, the following number of shares was outstanding for each Trust:

Shareholders of record at the close of business on July 31, 2025, will be entitled to one vote for each share held, and each fractional share will be entitled to a proportionate fractional vote. Each Trust will vote separately on each item; votes of multiple Trusts will not be aggregated.

The mailing address of each Trust is 111 Huntington Avenue, Boston, Massachusetts 02199. Solicitation of proxies is being made by the mailing of the Notice and this Proxy Statement with its enclosures on or about August 22, 2025. In addition to soliciting proxies by mail, the Trustees of your Trust and employees of Massachusetts Financial Services Company (“MFS”), your Trust’s investment adviser and administrator, may solicit proxies in person or by telephone. The expenses of the preparation of Proxy Statements and related materials, including printing and delivery costs, and vote solicitation are borne on a proportional basis by each Trust.

The Trusts have engaged Computershare to provide solicitation and voting tabulation services. It is anticipated that the cost of these services will be $32,084 and may increase substantially in the event that any proposal is contested or increased solicitation efforts are required.

Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meetings To Be Held on October 2, 2025.

The Proxy Statement is available at www.mfs.com. If you elect to vote in person, directions to the Meetings in order to vote in person are available by telephoning toll-free (800) 225-2606. If your shares are held by your broker, in order to vote in person at the Meeting, you will need to obtain a “Legal Proxy” from your broker and present it to the Inspector of Election at the Meeting. Also, in order to revoke your proxy, you may need to forward your written revocation or a later-dated proxy card to your broker rather than to the Trust.