MONTANA PAYCHECK CALCULATOR

Our Montana Paycheck Calculator 2026 gives Big Sky State workers a precise, verified breakdown of what every paycheck delivers after every mandatory deduction. Montana’s income tax underwent its most significant structural reform in decades when SB 399 (2021) took effect in 2024, consolidating six progressive brackets into a clean two-bracket system — 4.7% on the first $20,500 of Montana taxable income and 5.9% on everything above. The top rate fell from 6.9% to 5.9%, a full percentage point reduction.

Montana also has one of the most distinctive standard deduction formulas in the country: rather than a fixed dollar amount, the state deduction equals 20% of your adjusted gross income, subject to a cap. This income-linked design means the deduction automatically scales with earnings up to its maximum — a feature no neighboring state replicates.

See how Montana compares across the Northwest and Great Plains at our USA Paycheck Calculator hub, or jump directly to Wyoming, North Dakota, Idaho, or Colorado.

Every Deduction on a Montana Paycheck in 2026

Montana keeps its paycheck deduction list to four universal items. No disability insurance withholding, no paid family leave contribution, no city or county income taxes anywhere in the state. Whether you work in Billings, Missoula, Great Falls, Bozeman, or a rural ranch county, every Montana worker sees the same four deductions:

• Federal Income Tax — Applied using the 2026 progressive federal schedule (10%–37%) after the federal standard deduction reduces taxable income. Single filers deduct $15,000, MFJ filers deduct $30,000, and HOH filers deduct $22,500 before federal brackets apply.
• Social Security — 6.2% of gross wages up to the 2026 annual wage base of $176,100. Wages above this ceiling are Social Security-exempt for the remainder of the year.
• Medicare — 1.45% on all earned income with no cap. An additional 0.9% Medicare surtax applies to individual wages exceeding $200,000 per year.
• Montana State Income Tax — Two brackets: 4.7% on MT taxable income up to $20,500, then 5.9% on the amount above that, applied after Montana's own standard deduction and personal exemption.

Montana Income Tax Brackets 2026 — Post-Reform Structure

Prior to 2024, Montana used six progressive income tax brackets ranging from 1% to 6.9%. Senate Bill 399, signed in 2021 and effective January 2024, swept that away and replaced it with two clean tiers. The bracket threshold and rates for 2026:

The same brackets apply to all filing statuses — Single, MFJ, and HOH all use identical tier thresholds. The difference between filers lies entirely in the deductions applied before the brackets are consulted: MFJ filers deduct more in standard deduction and exemption, which produces a lower Montana taxable income and therefore a lower effective state tax rate on the same gross wages.

At a gross salary of $70,000 (Single), the full bracket calculation works like this:

MT Taxable = $70,000 − $5,000 (std ded) − $2,650 (exemption) = $62,350
First $20,500 × 4.7% = $963.50
Remaining $41,850 × 5.9% = $2,469.15
Total MT State Tax = $3,432.65

Montana's Unique AGI-Based Standard Deduction

Montana's approach to the standard deduction stands apart from every state in its region. Rather than setting a fixed dollar amount (as the federal system and most states do), Montana defines its standard deduction as a percentage of the taxpayer's own income:

In practice, the 20% formula hits its cap quickly. A Single filer earning $25,000 already has 20% = $5,000 — the maximum. Any worker earning more than $25,000 (Single) or $50,000 (MFJ) is at the cap and effectively uses a flat deduction. The percentage formula only matters for lower-income workers who benefit from it automatically scaling down with their income.

Montana Personal Exemption 2026

In addition to the standard deduction, Montana provides a personal exemption that further reduces the income subject to state income tax. For 2026 the amounts are approximately:

Combined with the standard deduction, a Single Montana filer reduces gross wages by $7,650 ($5,000 + $2,650) before the bracket table applies. A MFJ filer reduces by $15,300 ($10,000 + $5,300) — more than double, reflecting the larger combined deductions available to married couples filing jointly.

Montana vs Rocky Mountain Neighbors — Take-Home at $70,000

Montana sits in a region with wildly varied income tax philosophies — from no-tax Wyoming to high-rate Oregon — making the comparison table particularly instructive:

Montana's $3,433 state tax at $70,000 Single places it toward the higher end of the regional comparison — above Colorado ($2,420), Utah ($3,025), North Dakota ($1,268), and New Mexico ($2,220), but well below Oregon ($4,963). Against Wyoming (zero income tax), Montana workers at $70,000 pay $3,433 more per year in state income tax — a gap of roughly $286 per month.

The gap between Montana and neighboring Idaho is narrow — about $533 per year at this income level. Montana's lower bracket rate (4.7% vs Idaho's flat 5.8%) saves money in the lower tier, but both states converge toward similar effective rates at typical working incomes.

Montana's SB 399 Reform — What Changed in 2024

Montana's income tax had operated under a six-bracket structure for decades before the 2021 legislature passed SB 399, the most substantial income tax overhaul in the state's recent history. The old structure reached a 6.9% top rate across brackets starting at 1% for the lowest incomes. The new two-bracket system that took effect in 2024:

The reform cut the top marginal rate by a full percentage point while eliminating the five lower brackets that previously applied only to very small slices of income. Workers at all income levels above the $20,500 threshold benefit from the reduced top rate. The simplification also makes Montana withholding calculations significantly easier for employers and payroll systems.

2026 Federal Tax Brackets for Montana Workers

Federal income tax applies uniformly to all Montana employees. After the 2026 federal standard deduction, Single filer taxable income passes through these tiers:

• 10% on the first $11,925 of taxable income
• 12% from $11,925 to $48,475
• 22% from $48,475 to $103,350
• 24% from $103,350 to $197,300
• 32% from $197,300 to $250,525
• 35% from $250,525 to $626,350
• 37% on taxable income above $626,350

Montana Paycheck Calculator FAQs

What is Montana's income tax rate in 2026?
Montana uses two brackets: 4.7% on the first $20,500 of Montana taxable income and 5.9% on Montana taxable income above $20,500. The same thresholds apply to all filing statuses. This structure has been in place since 2024 following the SB 399 reform that consolidated Montana's previous six-bracket system.

How does Montana's standard deduction work?
Montana's standard deduction equals 20% of your adjusted gross income, subject to a minimum of $2,500 and a maximum of $5,000 for Single filers (double for MFJ). Once your gross wages exceed approximately $25,000, the deduction is always at the $5,000 cap — so most working Montanans use $5,000 as their state standard deduction regardless of their exact income.

How much will I take home on a $70,000 salary in Montana?
Filing as Single on $70,000, your Montana taxable income is $62,350 after the $5,000 standard deduction cap and $2,650 personal exemption. You owe $963.50 on the first $20,500 and $2,469.15 on the remaining $41,850, totaling $3,433 in state tax. Combined with $7,014 federal and $5,355 FICA, estimated annual take-home is about $54,198, or roughly $4,517 per month.

Does Montana have any local income taxes?
No. Montana does not authorize any city, county, or municipality to levy a local income tax on wages. Workers in Billings, Missoula, Great Falls, or any other Montana community all pay only the statewide two-bracket rate — there is no geographic surcharge.

How did SB 399 change Montana taxes?
Senate Bill 399 (2021, effective 2024) replaced Montana's six-bracket system — which ranged from 1% to 6.9% — with two brackets at 4.7% and 5.9%. The top rate was cut by a full percentage point. Workers earning above $20,500 in Montana taxable income benefited from the reduction in the top rate; the simplification from six brackets to two also eliminated complex mid-range bracket calculations.

Run your Montana estimate again any time: Montana Paycheck Calculator 2026