MFS CHARTER INCOME TRUST

The signer of this proxy card hereby appoints Christopher R. Bohane, Tiffany Ko, Brian E. Langenfeld, Amanda S. Mooradian, Susan A. Pereira, Matthew A. Stowe, and William B. Wilson and each of them separately, proxies, with power of substitution, and hereby authorizes each of them to represent, and to vote, as designated on the reverse side, at the Meeting of Shareholders of the above-referenced Trust, to be held on Thursday, October 2, 2025 at 10:30 a.m., Eastern Time, and at any adjournments or postponements thereof, all of the common shares of the Trust that the undersigned would be entitled to vote if personally present. Only the Trust’s shareholders of record on July 31, 2025 will be entitled to vote at the Trust’s Meeting of Shareholders.

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY THE SIGNING SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTEDFOR THE PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING OR ANY ADJOURNMENTS OF THE MEETING. THE TRUSTEES RECOMMEND A VOTEFOR THE PROPOSAL ON THE REVERSE SIDE.

YOUR VOTE IS IMPORTANT. WE WOULD APPRECIATE YOUR PROMPTLY VOTING, SIGNING, DATING, AND RETURNING THE ENCLOSED PROXY, WHICH WILL HELP AVOID THE ADDITIONAL EXPENSE OF A SECOND SOLICITATION FOR YOUR TRUST. THE ENCLOSED ADDRESSED ENVELOPE REQUIRES NO POSTAGE AND IS PROVIDED FOR YOUR CONVENIENCE.

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Note: Please sign exactly as your name(s) appear(s) on this proxy card, and date it. When shares are held jointly, each holder should sign. When signing as attorney, executor, administrator, trustee, officer of corporation or other entity or in another representative capacity, please give the full title under the signature.