Alliancebernstein National Municipal Income Fund, Inc. (the Fund) is a closed-end fund. The Fund seeks to provide high current income exempt from regular federal income tax by investing substantially all of its net assets in municipal securities that pay interest that is exempt from federal income tax. The Fund will normally invest at least 80%, and normally substantially all, of its net assets in municipal securities paying interest that is exempt from regular federal income tax. The Fund also normally will invest at least 75% of its assets in investment-grade municipal securities or unrated municipal securities considered to be of comparable quality. The Fund may invest up to 25% of its net assets in municipal bonds rated below investment-grade and unrated municipal bonds considered to be of comparable quality as determined by AllianceBernstein L.P., (the Adviser).