2026 official-source estimate
Montana Paycheck Calculator
Estimate 2026 Montana wage withholding from the official pay-period formulas and Form MW-4 elections.
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Federal withholding profile
Federal W-4 adjustments
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Year-to-date wages and other deductions
Included
What this estimate covers
- Federal income tax withholding
- Social Security and Medicare
- All 2026 Montana Single, Married, and Head of Household formulas for supported pay periods
- Form MW-4 Line 2 higher Single schedule for married joint filers with both spouses working
- Form MW-4 Line 3 extra withholding, Line 4 specified withholding, and valid Line 5 exemption
Limitations
What is not included
- Partial wage allocation for tribal, National Guard, or other limited exemptions
- North Dakota reciprocity and other interstate wage-allocation decisions
- Supplemental-wage and bonus withholding methods
- Unentered employer benefits and unsupported deduction treatments
How the Montana estimate works
Enter gross pay for one pay period, federal W-4 adjustments, and the state details shown above. Federal withholding follows Publication 15-T. Montana applies the 2026 formula for the selected pay period and Form MW-4 status, using the 4.7% and 5.65% tiers and the Department of Revenue’s whole-dollar rounding demonstrated in its official examples. Form MW-4 Line 3 is added after regular withholding. A nonblank Line 4 amount replaces the formula, while a valid Line 5 exemption can reduce Montana withholding to zero.
Example: The official Montana example uses $475 of weekly wages and the Single schedule. The formula applies 4.7% to the amount over $310: $7.755, which rounds to $8 of Montana withholding. A married joint filer with both spouses working uses that same higher Single schedule. The calculator does not assume any unentered benefit deduction or invent a tax result.
Weekly, biweekly, semimonthly, and monthly are the supported paycheck frequencies. “Annual salary” is an earnings input and the annual view is a simple period multiplication; neither is an annual payroll-period method. The special Form W-4 adjustment for nonresident aliens is not modeled.
How does Montana paycheck withholding work? Montana uses a separate Form MW-4 status and 2026 pay-period formula. Line 3 adds extra withholding, while a Line 4 amount replaces the formula entirely. A Line 5 exemption should be used only when the certified exemption covers every wage dollar in the paycheck.
Source trail
Official data used on this page
Each rule is versioned and reviewed before production use.
See every checksum and effective date on the tax data sources page.