Montana Individual Income Tax Forms (Tax Year 2025)
Montana individual income taxes are administered by the Montana Department of Revenue.
This page provides official resources for Montana individual income tax forms for tax year 2025, filed in 2026.
File Montana Income Tax Online (2025)
Montana provides electronic filing and payment through its official online system.
Taxpayers can file returns, make payments, and manage accounts using TransAction Portal.
Quick Links (Official Montana Department of Revenue)
The official Montana Department of Revenue website is available at
Montana Department of Revenue.
General information about individual income tax is available on the
Montana individual income tax overview page.
Official Montana tax forms for all years are available in the
Montana Department of Revenue forms library.
Montana Individual Income Tax Forms (2025)
Montana residents file their state income tax return using
Form 2, Montana Individual Income Tax Return.
Taxpayers who make estimated payments use
Form ES, Montana Estimated Income Tax.
An extension of time to file may be requested using Form EXT.
Previously filed Montana individual income tax returns may be corrected using
Form 2X, Amended Montana Individual Income Tax Return.
Montana Individual Income Tax Deadlines (Tax Year 2025)
Montana individual income tax returns for tax year 2025 are due April 15, 2026.
Approved filing extensions generally run through October 15, 2026.
Estimated tax payments are generally due on April 15, June 15, September 15, 2026, and January 15, 2027.
Montana Taxpayer Resources (2025)
Taxpayers can file returns and make payments using TransAction Portal.
Additional guidance is available on the Montana individual income tax guidance page.
Contact information for the Montana Department of Revenue is available on the official contact page.
Disclaimer
This page links to official Montana Department of Revenue resources for informational purposes only.
Tax laws, forms, and filing requirements may change.
Always verify information on the official Montana Department of Revenue website.
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