To provide current income exempt from regular U.S. federal income tax (but which may be subject to the federal alternative minimum tax in certain circumstances) and to return $25.00 per common share to holders of common shares on or about December 31, 2030. The Trust seeks to achieve its investment objectives by investing at least 80% of its assets in municipal bonds exempt from U.S. federal income taxes. The Trust invests at least 80% of its assets in municipal bonds that are investment grade quality, or are considered by the Trust’s investment adviser to be of comparable quality, at the time of investment.