State Income Tax
Montana imposes a state income tax using a graduated tax structure with 2 brackets ranging from 4.7% to 5.9%. The filing deadline is 2026-04-15. Social Security benefits are subject to state income tax in Montana. Retirement income is generally taxable. Montana follows federal taxability of Social Security with some adjustments.
Retirement Income Details
Montana follows federal taxability of Social Security with some adjustments.
Does Montana have a state income tax?
Yes. Montana has a state income tax with a graduated structure ranging from 4.7% to 5.9% across 2 brackets.
What is the Montana income tax rate?
Montana has a graduated income tax with 2 brackets. The lowest rate is 4.7% and the highest rate is 5.9%.
Is Social Security taxed in Montana?
Yes. Montana taxes Social Security benefits as part of state income. Retirees should factor this into their retirement income planning.
Is retirement income taxed in Montana?
Yes. Montana generally taxes retirement income. Montana follows federal taxability of Social Security with some adjustments.
When is the Montana income tax filing deadline?
The Montana state income tax filing deadline is 2026-04-15. You can file and pay through the official Montana Department of Revenue portal.
What is the standard deduction in Montana?
Montana's standard deduction is $14,600 for single filers and $29,200 for married filing jointly.
How does Montana income tax compare to neighboring states?
Montana's top rate of 5.9% is in the moderate range nationally. Use the comparison table above to see how neighboring states compare.
Official Payment Portal
Montana Department of Revenue
Last verified: 2026-03-31 · Always consult a tax professional before making financial decisions.