MFS Municipal Income Trust operates as a nondiversified and closed-end management investment company. The fund primarily invests in municipal bonds and high-yield securities. Its portfolio of investments include companies operating in various sectors, such as airport and port, chemicals, healthcare, human services, environmental services, entertainment and tourism, multifamily housing, single family housing, tobacco, transportation, utilities, paper, and metals sectors. Massachusetts Financial Services Company serves as investment advisor of the trust. The trust was founded in 1986 and is based in Boston, Massachusetts.