| State Name | Montana |
| Business Entity Type | S-Corporations |
| Extension Status | Approved Automatically |
| Return Due Date | March 17, 2025 |
| Extended Due Date | September 15, 2025 |
| Other Information | * Montana grants you an automatic 6-month extension to file your business tax return. * The extension is NOT an extension to pay any taxes you may have due. Tax payments are due by the original return due date. |
| Online Payment | Montana | Online Tax Extension Payment |
| Payment Voucher Form | Form CT | Montana Corporate Income Tax Payment Voucher |
| State Payment Agency | Montana Department of Revenue |
| Mailing Address with Payment | Montana Department of Revenue |
| Failure to File Penalties | Lesser of $50 or tax due. |
| Failure to Pay Penalties | 1.2% a month or fraction of a month on the unpaid tax, up to 12%. |
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