Do not request an extension to file. All corporations are granted an automatic sevenmonth extension to file Form M4, Corporation Franchise Tax Return.IRS e-file is the IRS's electronic filing program. Minnesotans automatically have until Oct. 15 to file state taxes before charging late fees. A Minnesota personal extension will give you 6 more months to file your return, moving the deadline to October 15 (for calendar year filers). Minnesota offers a 6-month extension, which moves the individual filing deadline from April 15 to October 15. Minnesota allows an automatic extension to October 15 without a written application. The state of Minnesota supports the automatic extension of time to file personal income tax Form M1. Minnesota allows an automatic extension to October 15 without a written application.