Eaton Vance Massachusetts Municipal Income Fund Class A (ETMAX) is an open-end mutual fund that seeks current income exempt from regular federal income tax and Massachusetts state personal income taxes by investing at least 80% of its net assets in Massachusetts municipal obligations. The fund primarily holds municipal bonds issued by Massachusetts state authorities, including health and educational facilities revenue bonds, special obligation dedicated tax revenue bonds, port authority revenue bonds, water pollution abatement trust bonds, and development finance agency revenue bonds; top holdings as of recent data include Massachusetts ST Health & Edl Facs Auth Rev 5.5%, Massachusetts ST Spl Oblig Dedicated Tax Rev 5.5%, and Massachusetts ST Port Auth Rev 5%; the portfolio features 97.28% in US bonds, 98.31% in municipal tax-exempt securities, with mid credit quality and extended interest-rate sensitivity. Launched on December 7, 1993, and domiciled in the United States with headquarters at Two International Place, Boston, Massachusetts, the fund is managed by Craig Brandon since February 22, 2010, and Julie Callahan since October 1, 2021, with total net assets of approximately $131.45 million and a share class size of $66.13 million for Class A shares. Eaton Vance, the fund's investment adviser, operates as part of Morgan Stanley Investment Management following Morgan Stanley's acquisition of Eaton Vance Corp. in March 2021, integrating the fund into a broader platform with enhanced fixed income capabilities; recent developments include the October 2025 revision of principal investment strategies for certain Eaton Vance funds to increase flexibility by removing minimum investment requirements in specific categories and credit quality restrictions, alongside new product launches such as the Eaton Vance Income Opportunities ETF in November 2025. The fund targets Massachusetts state personal income tax-exempt investors, with a net expense ratio of 0.81%, a 3.25% front-end load, and a minimum initial investment of $1,000, available primarily to US investors.