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Montana Income Tax Calculator

Calculate your combined federal and Montana state income tax

Don't know your taxable income? Calculate it from gross income

Federal standard deduction (single): $16,100

Estimated taxable income: $0

⚠️ This calculator provides estimates for educational purposes only. It is not financial, tax, or legal advice. Your actual results may vary.

How Montana Income Tax Works

Montana uses progressive tax brackets, similar to the federal system. Each bracket rate applies only to income within that range. This calculator computes both your federal andMontana state tax to show your total tax burden.

Frequently Asked Questions

How do Montana's tax brackets work?
Montana uses 2 progressive brackets. Each rate applies only to income within that bracket range, so your effective rate is always lower than your top marginal rate of 5.65%.
Is Montana's income tax in addition to federal tax?
Yes. You pay both federal income tax and Montana state income tax. This calculator shows your combined total tax burden from both.
What is Montana's top income tax rate?
Montana's top marginal income tax rate is 5.65%, which applies only to income in the highest bracket. Most earners pay a lower effective rate because earlier income is taxed at lower rates.

Important Considerations

  • • This calculator estimates federal + state income tax only. It does not include FICA, local taxes, or other deductions.
  • • Your filing status affects federal brackets and standard deduction. State brackets shown use single-filer thresholds; some states have wider brackets for joint filers, which may result in slightly lower state tax.
  • • Some states allow deductions for federal taxes paid, which is not reflected here.
  • • This is for educational purposes only and is not tax advice.

Related Resources

Montana Tax Authority

Official Montana state tax information, forms, and filing resources.

IRS Federal Income Tax Rates and Brackets

The IRS page showing all seven bracket rates and thresholds for every filing status. This is the primary official source for federal income tax rate information.

IRS Revenue Procedure 2025-32

Official IRS inflation adjustments for tax year 2026, including income tax brackets, standard deductions, and other provisions as amended by the One Big Beautiful Bill Act (OBBBA). Published October 9, 2025.

Read the IRS inflation adjustments that set 2025 bracket thresholds

Revenue Procedure 2024-40 is the authoritative IRS document that sets inflation-adjusted tax parameters for 2025, including bracket thresholds, standard deduction amounts, and other key values.

Use IRS Publication 17 as a complete guide to filing your federal income tax

Publication 17 is the IRS's comprehensive guide for individual taxpayers. It covers filing requirements, standard deduction amounts, taxable income calculations, credits, and deductions for tax year 2025.

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