MFS Charter Income Trust (the Fund) is a closed-end fund and normally invests in corporate bonds of U.S. and/or foreign issuers, U.S. Government securities, foreign government securities, mortgage-backed and other asset backed securities, and emerging market debt securities. The Fund's investment objective is to seek high current income, but may also consider capital appreciation. The Fund invests in high-yield securities rated below investment grade. Investments in high-yield securities involve greater degrees of credit and market risk than investments in higher-rated securities and tend to be more sensitive to economic conditions. The Fund invests a portion of its assets in asset-backed and/or mortgage-backed securities. The Fund may invest up to 100% of the fund's assets in less than investment grade quality debt instruments.