Montana Income Tax Calculator 2026
Estimate your Montana (MT) income tax for 2026. Montana has a 5.9% flat state income tax. Enter your income below and click “Calculate Taxes” for an instant breakdown.
Tax Information
Enter your income to estimate your tax liability
Montana Income Tax Overview
Montana has a flat income tax rate of 5.9%. This means all taxable income is taxed at the same rate regardless of how much you earn.
The standard deduction in Montana is $14,600 for single filers and $29,200 for married filing jointly.
Frequently Asked Questions
- What is the Montana income tax rate?
- Montana has a flat income tax rate of 5.9%. All taxable income is taxed at this same rate regardless of income level.
- Does Montana have a standard deduction?
- Yes. The Montana standard deduction is $14,600 for single filers and $29,200 for married filing jointly.
- How is Montana income tax calculated?
- Montana uses a flat tax system. After subtracting your standard deduction (if applicable), your remaining taxable income is taxed at a flat rate of 5.9%, then added to your federal tax and FICA obligations.
- How do I calculate my total Montana tax bill?
- Your total tax includes federal income tax (10%–37%), Social Security (6.2% on the first $176,100), Medicare (1.45%), and Montana state income tax. Use our free calculator above for an instant breakdown.
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