MFS High Income Municipal Trust is a closed-end fixed income mutual fund launched and managed by Massachusetts Financial Services Company. It invests primarily in municipal bonds and local general obligations across sectors such as multifamily housing, hospitals, care retirement, and investor-owned utilities. The fund benchmarks its performance against the Barclays Municipal Bond Index. Formerly known as Colonial High Income Municipal Trust, it was formed on February 17, 1989, and is domiciled in the United States.