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Montana Income Tax Calculator (2026 Brackets)

What does this come to under the current IRS rules?

Montana income tax at 4.7% to 5.65% by filing status, plus marginal and effective rate.

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Your figures
Example figuresIllustrative only. Type over them with your own.
Montana income tax
$4,351
Montana income tax on the figures entered, tax year 2026
Montana taxable income
$85,000
Tax from the rate schedule
$4,351
Drawn to one scale
Montana taxable income$85,000
Tax from the rate schedule$4,351
Montana income tax$4,351
All results
MeasureResult
Montana taxable income$85,000
Tax from the rate schedule$4,351
Montana income tax$4,351
Marginal rate5.65%
Effective rate on income entered5.12%
How this was worked out
Work shownrecomputed as you type
Tax = 4.7% to $47,500 ($71,250 head of household, $95,000 joint), 5.65% above (HB 337, 2026)
Montana income tax = tax from the rate schedule

Illustrative arithmetic on the figures you enter. Check the result against your firm's methodology before relying on it.

The formulas

  • Tax = 4.7% to $47,500 ($71,250 head of household, $95,000 joint), 5.65% above (HB 337, 2026)
  • Montana income tax = tax from the rate schedule

How it works

Tax year: 2026.

Montana taxes income at 4.7% to 5.65%. Enter Montana taxable income: the state starts from federal taxable income, so the federal standard deduction is already in it. The tool computes state income tax only; credits other than those named are not applied.

HB 337 widened Montana's lower bracket and cut the top rate from 5.9 to 5.65 percent for 2026. Montana taxable income starts from federal taxable income (before the federal QBI deduction), so the federal standard deduction is already applied: enter Montana taxable income. Filers 65 and older take a further inflation-indexed subtraction, not applied here.

Local taxes: Montana cities and counties do not levy a local income tax.

Illustrative figures only. Check the result against your firm's methodology before relying on it.

Common questions

What is the Montana income tax rate for 2026?

Montana taxes income at 4.7% to 5.65% for 2026. Tax = 4.7% to $47,500 ($71,250 head of household, $95,000 joint), 5.65% above (HB 337, 2026).

Does Montana have a standard deduction?

Montana starts from federal taxable income, so the federal standard deduction is already applied.

Are there local income taxes in Montana?

Montana cities and counties do not levy a local income tax.

Sources

Runs in your browser. The figures you type are not sent to CORAA or stored. Check the result against your firm's methodology before relying on it.

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