Does Montana Tax Social Security?
Montana taxes Social Security the same way the federal government does: whatever portion is federally taxable (up to 85%) is also taxable in Montana, with no state-specific exemption.
Montana is one of only 8 states that tax Social Security benefits in 2026.
State Tax Rate
4.7% & 5.9%
Who's Exempt
Follows federal taxable amount
Who is exempt from Montana's Social Security tax?
Available Exemptions & Deductions
- No Social Security–specific exemption: Montana starts from federal taxable income, so the federally exempt portion of benefits stays exempt.
- If your benefits aren’t federally taxable (provisional income below the federal thresholds), Montana doesn’t tax them either.
Key facts about Montana and Social Security
Montana’s 2024 tax restructure moved to two brackets: 4.7% and 5.9%.
Montana is the only taxing state with no benefit-specific exemption or income threshold of its own — federal treatment flows straight through.
Residents 65+ do get a general income subtraction ($5,660 for tax year 2025, indexed) that softens the bill without being Social Security–specific.
Tax-smart strategy for Montana residents
Because Montana mirrors the federal calculation, every strategy that reduces federally taxable Social Security — claiming age, withdrawal sequencing, Roth conversions before claiming — pays off twice: once on the federal return and again at up to 5.9% for the state.
Frequently Asked Questions
About Montana Social Security tax
Social Security tax rules in other states, 2026
Beyond state tax: the numbers that move more
The state tax on benefits is usually a few hundred dollars a year. These decide thousands — and three of them are set in Washington, not in the statehouse.
- Optimal Social Security Strategy for Married CouplesCoordinate both records — spousal excess, survivor protection, and the claiming-age combinations that maximize the household's lifetime benefit.
- Social Security & Medicare 2027: Every Number in One PlaceCOLA, Part B, IRMAA brackets, Part D, earnings-test limits — each figure labeled official or projected, updated in place as agencies announce.
- Social Security Claiming Timing and the IRMAA LookbackOne dollar over a threshold applies the surcharge for the whole year — decided by a tax return from two years ago. How claiming feeds in.
- SECURE 2.0's Roth Catch-Up and Your Social Security TaxHow the forced-Roth catch-up rule, effective 2026, quietly changes how high earners' benefits are taxed.