Montana charges 4.7-5.65% state income tax. Use the w-4 withholding calculator pre-loaded with Montana rates.
Open W-4 Withholding Calculator →Getting your W-4 right in Montana is important because you need to coordinate federal withholding with Montana's graduated (4.7-5.65%) state withholding. If your W-4 is set too conservatively, you lend the government an interest-free loan; too aggressively, and you face an underpayment penalty. This calculator helps you dial in the right federal withholding amount given your Montana state tax situation.
Montana uses a graduated income tax with brackets ranging from 4.7-5.65%. Lower income is taxed at lower rates, with the 5.65% top rate applying only to income in the highest bracket. This progressive structure means your effective state tax rate is always lower than the top marginal rate. Montana does not have local income taxes, so the state graduated rate is the total state-level income tax burden.
The table below shows what you actually keep at five salary levels in Montana, accounting for federal tax, FICA, and Montana's graduated (4.7-5.65%) state tax.
See how Montana compares to other West states. Each link takes you to the w-4 withholding calculator landing page for that state.
For a comprehensive breakdown of Montana’s tax structure, salary comparisons, cost-of-living analysis, and more, visit the full Montana take-home pay page.