Montana State Tax Calculator 2026
Estimate your Montana state income tax and take-home pay for tax year 2026.
Last updated: November 2025 · Source
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Montana 2026 tax overview
HB337 effective 2026: 2 brackets, top rate cut from 5.9% to 5.65%. Further cut to 5.4% in 2027.
Breakdown
Frequently Asked Questions
What are the 2026 Montana income tax rates?
Montana uses a 2-bracket progressive schedule with rates from 4.70% to 5.65%. HB337 effective 2026: 2 brackets, top rate cut from 5.9% to 5.65%. Further cut to 5.4% in 2027.
What is the 2026 Montana standard deduction?
Montana conforms to the federal standard deduction ($16,100 single, $32,200 MFJ for 2026 per Rev. Proc. 2025-32).
Does Montana tax Social Security benefits?
Tax treatment of Social Security varies by state. Montana's rules can change year-to-year, check the Montana Department of Revenue for the most current guidance.
What is the difference between federal and Montana state income tax?
Federal tax is collected by the IRS at uniform rates nationwide (10%-37%). Montana state tax is separate, with its own brackets and rules. Total income tax burden = federal + state combined.