Montana Extension
You're granted an automatic, six-month extension of time for filing your Montana income tax return. You do not have to apply for a federal extension in order to receive a Montana extension.
Any extension of time to file your Montana income tax return is not an extension of time to pay your income tax liability. If you haven't paid your entire 2025 income tax liability by April 15, 2026, you aren't relieved of late payment penalties and interest on your outstanding Montana income tax liability.
If you were serving in, or in support of, the U.S. Armed Forces in a designated combat zone or contingency operation, the extension of time to file your Montana tax return is the same as the extension you receive for your federal tax return. See the IRS Publication 3 for more information.
For help filling out Form IT to pay any Montana tax due by the due date, go to: Menu Path: Account > File an Extension
Any extension of time to file your Montana income tax return is not an extension of time to pay your income tax liability. If you haven't paid your entire 2025 income tax liability by April 15, 2026, you aren't relieved of late payment penalties and interest on your outstanding Montana income tax liability.
If you were serving in, or in support of, the U.S. Armed Forces in a designated combat zone or contingency operation, the extension of time to file your Montana tax return is the same as the extension you receive for your federal tax return. See the IRS Publication 3 for more information.
For help filling out Form IT to pay any Montana tax due by the due date, go to: Menu Path: Account > File an Extension
