Estimate your Montana state income tax plus combined federal and MT state tax for 2026. 6.75% top rate.
Montana has progressive income tax with a top rate of 6.75% on income over $20,500. Montana has no state sales tax, one of only five states without one, which helps offset the income tax burden. Use the calculator above to estimate your combined federal and Montana state income tax for 2026. State tax figures use a simplified rate — for precise Montana state tax calculations, consult the Montana Department of Revenue or a licensed tax professional.
Montana uses a 6.75% top rate state income tax structure. Like most states, Montana starts its calculation from your federal Adjusted Gross Income (AGI), then applies state-specific adjustments — subtracting income Montana excludes from taxation (such as certain pension or Social Security income) and adding back any income Montana taxes that the federal government does not. After adjustments, the Montana standard deduction is applied, then the 6.75% top rate is applied to arrive at state taxable income.
Montana income tax is collected through employer paycheck withholding for W-2 employees and through quarterly estimated payments for self-employed residents and those with significant non-wage income. The Montana state return is generally due April 15, aligned with federal returns. Part-year residents and nonresidents who earn income sourced in Montana must also file a Montana return for that income portion.
Your Montana state income taxes are deductible on your federal Schedule A as part of the SALT (State and Local Tax) deduction, capped at $40,400 in 2026 under OBBBA. At the 22% federal bracket, paying $2,192 in Montana state income tax generates approximately $482 in federal tax savings, reducing the true net cost of your Montana taxes to about $1,710 for itemizing taxpayers.
Jordan is a single filer earning $75,000 in Montana. This shows how federal and Montana state income tax are calculated together.
Moving to a no-income-tax state (Texas, Florida, Nevada, or Wyoming) would save Jordan approximately $2,192/year ($182/month) in state income taxes. However, no-income-tax states often fund services through higher property taxes, sales taxes, or other fees, so a complete comparison requires evaluating all taxes together, not just income tax.
Montana Tax Rate and Annual Filing
Montana residents earning above the state filing threshold must file a Montana income tax return annually, typically due April 15. The 6.75% top rate applies after Montana-specific deductions and any state tax credits. Employers withhold Montana state income tax from employee paychecks throughout the year using Montana withholding tables, and any balance owed or refund due is settled when the annual state return is filed. Self-employed Montana residents make quarterly estimated payments to the state in addition to their federal quarterly estimated tax payments.
Federal SALT Deduction Reduces Net State Tax Cost
State income taxes paid in Montana reduce your federal taxable income through the SALT deduction (capped at $40,400 in 2026 under OBBBA). For a Montana resident in the 22% federal bracket paying $2,192 in state income tax, the SALT deduction recovers approximately $482 in federal taxes, so the true after-federal-benefit cost of Montana state income tax is about $1,710. This offset only benefits taxpayers who itemize deductions on federal Schedule A rather than taking the standard deduction.
Total Tax Burden: State Income Tax Is One Piece
State income tax is one component of your total tax burden in Montana. Property taxes, local income taxes (in some Montana cities and counties), and state and local sales taxes also contribute to your overall cost of living. When comparing Montana to other states, evaluate all tax types together rather than income tax in isolation. Use the calculator above to see your combined federal and Montana state effective rate at your specific income level.
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Montana has a 6.75% top rate state income tax for 2026. Montana has progressive income tax with a top rate of 6.75% on income over $20,500. Montana has no state sales tax, one of only five states without one, which helps offset the income tax burden. The state income tax is calculated separately from federal income tax and is paid through payroll withholding or quarterly estimated payments.
Montana has its own state standard deduction separate from the federal standard deduction ($15,750 single, $31,500 MFJ in 2026). For precise Montana state deduction amounts, consult the Montana Department of Revenue or a state tax professional.
Montana's 6.75% top rate state income tax can be compared to other states using our state tax calculator above. The U.S. average top marginal state income tax rate is approximately 5-6%. Nine states have no income tax at all (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming), while California has the highest at 13.3%.
Montana offers state tax credits and deductions that may reduce your state tax liability. Common state credits include earned income credits, child tax credits, and credits for the elderly. Consult the Montana Department of Revenue website or a licensed tax professional for credits specific to your situation and income level.
Use the calculator above. Enter your income and MT is pre-selected as your state. The calculator computes your 2026 federal income tax using the One Big Beautiful Bill Act brackets (10%-37%), adds your estimated Montana state income tax (6.75% top rate simplified), and displays your total tax burden, combined effective rate, and annual take-home pay. All calculations happen instantly in your browser.