Does Montana Accept Federal Extension - Web optimize operations, connect with external partners, create reports and keep inventory accurate. Web under the federal extension, individuals have until may 17, 2021 (extended from april 15, 2021) to file their federal income tax. — montana is extending its tax filing deadline to may 17 to match the new federal deadline.
— montana is extending its tax filing deadline to may 17 to match the new federal deadline. Web optimize operations, connect with external partners, create reports and keep inventory accurate. Web under the federal extension, individuals have until may 17, 2021 (extended from april 15, 2021) to file their federal income tax.