Tax Bracket Calculator for Montana (MT) — Free Calculator

Montana Tax Brackets (2026)

Montana uses a graduated income tax system with a top marginal rate of 5.9%.

Montana Bracket Structure

4.7% on first $20,500; 5.9% on income above $20,500 (2024; simplified from previous 7-bracket system)

Montana simplified its income tax in 2021 from a 7-bracket system to just two brackets. The top 5.9% rate kicks in at a relatively low $20,500, meaning most Montana filers pay at or near the top rate. Montana has no sales tax, which partially offsets the income tax burden.

Federal Tax Brackets Still Apply to Montana Residents

Regardless of Montana's state tax rules, all residents pay federal income tax. Federal brackets for 2024 range from 10% (on income up to $11,600 for single filers) to 37% (on income over $609,350). Your effective federal rate is typically well below the top marginal rate due to the graduated bracket structure.

Effective vs. Marginal Rate in Montana

Your marginal rate is the rate on your last dollar of income. Your effective rate is your total tax divided by total income. For Montana residents the marginal rate can reach 5.9% but most filers pay a lower effective rate. The median household income in Montana is $57,153.

Data: Tax Foundation (2024), IRS Statistics of Income, US Census Bureau ACS 2023. Updated 2024–2025. Figures reflect state averages — consult a licensed CPA for personalized tax advice.

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Frequently Asked Questions

What tax brackets apply to Montana residents?

Montana has a graduated income tax system. 4.7% on first $20,500; 5.9% on income above $20,500 (2024; simplified from previous 7-bracket system). Federal brackets also apply on top of the state tax.

What is the difference between marginal and effective tax rate in Montana?

Your marginal rate is the rate on your highest dollar of income. Your effective rate is your total tax burden divided by total income. In Montana, even if the top marginal rate is 5.9%, most residents pay a lower effective rate because lower income portions are taxed at lower brackets.

Does Montana have different tax brackets for married filers?

Yes, Montana typically has different bracket thresholds for single vs. married filing jointly filers. Married joint filers often have brackets approximately twice as wide, reducing the marriage penalty. Check the Montana Department of Revenue for current bracket tables.

How does this tax bracket calculator work for Montana?

Enter your income and filing status. The calculator applies both federal and Montana state tax brackets to show your marginal rate, effective rate, and total estimated tax. Montana's graduated rate of up to 5.9% is applied to your state taxable income.