How much of a $25,000 bonus do you keep in Montana?

On a $25,000 bonus in Montana, estimated take-home after taxes is $15,863, using the flat-rate supplemental wage method (22% federal withholding). This estimate assumes standard 2026 withholding and single filing status.

What percentage of a bonus is taxed in Montana?

The estimated effective bonus tax rate on a $25,000 bonus in Montana is approximately 36.5% using the supplemental wage (flat-rate) method. Federal withholding is 22%. Montana state withholding is estimated at $1,725.

How is a bonus taxed differently from regular pay in Montana?

Bonuses are supplemental wages. Employers may withhold federal income tax using the flat-rate method (22%) or the aggregate method. This calculator uses the flat-rate method. Your employer may use a different method, which can result in higher or lower withholding depending on your regular pay and W-4 elections.

Does Montana have a separate bonus tax rate?

Montana taxes bonuses as supplemental wages. Estimated Montana withholding on a $25,000 bonus is $1,725, based on 2026 state withholding tables.

2026 Montana Bonus Estimate

$25,000 Bonus After Taxes in Montana (2026)

Verified by Abhinav Jain · Updated 2026-06-10 · Methodology

Take-Home Bonus

$15,863

Effective bonus tax rate: 36.5%

Bonus Amount	$25,000
Federal Withholding (flat rate 22%)	$5,500
State Withholding	$1,725
Social Security	$1,550
Medicare	$363
Take-Home Bonus	$15,863

Bonus withholding uses the flat-rate supplemental wage method (22% federal). Your actual bonus withholding depends on your employer's payroll method, year-to-date earnings, and W-4 elections. Verify with your employer or a tax advisor before making financial decisions.

Calculation assumptions

Standard withholding per IRS Publication 15-T (2026)
Social Security wage base: $184,500 (SSA 2026)
No pre-tax deductions, no post-tax deductions
Filing status: Single, one job
Standard W-4 withholding (no additional withholding elections)
Actual paycheck may differ based on employer setup, benefits, or W-4 elections

View sources and full methodology →

How Your MT Paycheck Works

Montana paychecks are reduced by federal income tax withholding, FICA, and Montana income tax withholding. Federal withholding follows IRS Publication 15-T using Form W-4 and the wage-bracket or percentage method. FICA: Social Security is 6.2% on wages up to the 2026 wage base of $184,500, Medicare is 1.45% on all wages, and the 0.9% Additional Medicare Tax is withheld after wages exceed $200,000. Montana uses a graduated state income tax. For 2026, Montana's ordinary wage income tax rates are 4.7% and 5.65% (reduced from the prior 5.9% top rate under HB 337). For single and married-filing-separately taxpayers, 4.7% applies up to $47,500 and 5.65% applies above $47,500. Montana does not have a separate statewide employee SDI or paid family leave payroll deduction. Estimates assume standard 2026 withholding, single filing status, and no pre-tax deductions; actual paycheck may differ.

2026 Tax Rate Quick Reference

Tax	2026 Rate	Wage Cap	Source
Federal Income Tax	10%–37% (percentage-method withholding)	No wage cap	IRS Pub. 15-T
Social Security	6.2% employee withholding	$184,500	SSA 2026
Medicare	1.45% employee withholding	No wage cap	IRS Pub. 15
Additional Medicare Surtax	0.9% on wages over $200,000	No wage cap	IRS Topic 560
Montana State Income Tax	4.7% up to $47,500; 5.65% above $47,500 (HB 337)	No wage cap	Montana DOR HB 337 2026

$25,000 Bonus After Taxes in Montana (2026)

How Your MT Paycheck Works

2026 Tax Rate Quick Reference

Sources Used for This Estimate

Other bonus amounts for Montana

Salary take-home estimates for Montana

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