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Montana Income Tax Calculator 2026 — State Tax Brackets & Rates
Estimated Montana state income tax at common income levels, combined federal + state burden, and the full Montana tax bracket table — 2025 rates.
Reviewed for accuracy June 2026 by Gary Sing
State tax type
Progressive
State tax at $75k
$4,173
Federal tax at $75k
$8,114
Combined eff. rate $75k
16.4%
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Montana income tax at common income levels — 2025
Single filer, 2025 federal standard deduction ($15,000). Federal tax uses 2025 IRS brackets.
| Income | Montana state tax | State eff. rate | Federal tax | Total tax | Total eff. rate |
|---|---|---|---|---|---|
| $50,000 | $2,698 | 5.4% | $3,962 | $6,660 | 13.3% |
| $75,000 | $4,173 | 5.6% | $8,114 | $12,287 | 16.4% |
| $100,000 | $5,648 | 5.6% | $13,614 | $19,262 | 19.3% |
Single filer. Federal tax computed on gross income minus $15,000 standard deduction using 2025 IRS brackets. State tax estimates are approximate — consult a tax professional for exact liability. Does not include FICA (Social Security + Medicare), local taxes, or deductions beyond the standard deduction.
Montana state income tax rate 2025
Montana has a two-bracket system: 4.7% on income up to $21,000 and 5.9% above. Montana has no sales tax, making income tax the primary revenue source for state government.
| Taxable income (single) | Rate |
|---|---|
| $0 – $21,000 | 4.7% |
| Over $21,000 | 5.9% |
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Montana income tax — frequently asked questions
Does Montana have a state income tax?
Yes. Montana has a progressive income tax with rates up to 5.9%.
What is the Montana state income tax rate for 2025?
Montana has a progressive tax with a top rate of 5.9%. The effective rate depends on income level — at $75,000, the effective Montana state tax rate is approximately 5.6%.
How much Montana state income tax do I owe on $75,000?
On a $75,000 gross income (single filer, 2025), estimated Montana state income tax is approximately $4,173 (effective rate: 5.6%). Combined with federal income tax of approximately $8,114, total tax is about $12,287 — an overall effective rate of 16.4%.
What is the combined federal and Montana state income tax at $100,000?
At $100,000 gross income (single filer, 2025 standard deductions): federal income tax is approximately $13,614, Montana state income tax is $5,648, for a combined total of approximately $19,262 — an overall effective rate of 19.3%.
How does Montana's income tax compare to other states?
Montana's top rate of 5.9% places it in the moderate range nationally. The nine states with no income tax pay $0 in state income tax; the highest-tax states (California at 13.3%, Hawaii at 11%) have the largest state income tax burdens.