2026 official-source estimate
Estimate 2026 Montana wage withholding from the official pay-period formulas and Form MW-4 elections.
Quick answer
Montana: Estimate 2026 Montana wage withholding from the official pay-period formulas and Form MW-4 elections. This 2026 calculator combines that state treatment with federal withholding and FICA, while showing supported employee-paid programs and known exclusions explicitly.
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Included
Limitations
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.
State paycheck questions
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.
Included in this estimate: 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.
Not included in this estimate: 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.
Source trail
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