State & Local Tax (SALT)
State Tax Deadlines
Priyanka B A
Montana imposes income tax on both individuals and corporations.
Montana Tax Deadlines at a Glance (2026)
Entity Type | Return Due | Extension Deadline |
|---|---|---|
Individuals | April 15, 2026 | October 15, 2026 |
C Corporations | April 15, 2026 | October 15, 2026 |
S Corporations | March 16, 2026 | September 15, 2026 |
Partnerships | March 16, 2026 | September 15, 2026 |
Businesses
Montana requires withholding or composite filing for nonresident owners.
Estimated Taxes
Apply to individuals and corporations exceeding state thresholds.
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