For instance, a portion of the income you receive may be subject to the federal alternative minimum tax, even if that income is classified as tax free. (fidelity.com)
Under normal market conditions, the Near - Term Tax Free Fund invests at least 80 percent of its net assets in investment grade municipal securities whose interest is free from federal income tax, including the federal alternative minimum tax. (usfunds.com)
Certain funds normally seek to invest only in municipal securities generating income exempt from both federal income taxes and the federal alternative minimum tax; however, outcomes can not be guaranteed, and the funds may sometimes generate income subject to these taxes. (fidelity.com)