Montana Income Tax Calculator
Estimate your 2026 Montana state income tax in seconds. Enter your annual income and filing status — this free Montana income tax calculator applies the verified 2026 Montana brackets, standard deduction, exemptions and credits. Runs entirely in your browser.
In 2026, Montana has a graduated income tax ranging from 4.7% to 5.65%. Montana offers a $16,100 standard deduction for single filers ($32,200 joint). Montana cut its top rate from 5.9% to 5.65% for 2026 and widened the lower bracket.
Montana 2026 Income Tax Brackets
| Taxable income (Single) | Rate |
|---|---|
| $0 – $47,500 | 4.7% |
| Over $47,500 | 5.65% |
Married filing jointly
| Taxable income (Joint) | Rate |
|---|---|
| $0 – $95,000 | 4.7% |
| Over $95,000 | 5.65% |
Marginal rates: only income inside each band is taxed at that band's rate.
Frequently Asked Questions
What is the Montana income tax rate for 2026?
Montana has a graduated income tax ranging from 4.7% to 5.65%.
What deductions and exemptions does Montana offer?
Montana offers a $16,100 standard deduction for single filers ($32,200 joint).
How accurate is this Montana income tax estimate?
It is an annualized estimate: your income minus the 2026 standard deduction (and any state exemptions/credits shown), run through 2026 marginal brackets. It does not include pre-tax deductions like 401(k) contributions, itemized deductions, phaseouts, or local income taxes. Your actual liability can differ.
Sources
Tax figures verified September 2026 for tax year 2026.
Estimate only — not tax advice. This calculator annualizes your income, subtracts the 2026 standard deduction (and state personal exemptions/credits where shown), and applies 2026 marginal brackets. It does not model pre-tax deductions (401(k), health insurance), itemized deductions, credits you may qualify for, phaseouts, or local/city/county income taxes. Consult a tax professional for your situation.