# How much is Montana income tax?

Estimates 2026 Montana income tax from federal AGI, filing status, and dependents.

- Page: https://www.acalculator.org/finance/montana-income-tax-calculator
- JSON spec: https://www.acalculator.org/finance/montana-income-tax-calculator.json
- Version: 14aa0815fee4

## Default answer

Example with the default inputs (Filing status Single, Federal adjusted gross income $75,000.00, Dependents 0): On $75,000.00 of AGI, filing Single, Montana income tax is $2,876.60 (3.84% effective).

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| status | Filing status | Your federal filing status. |
| income | Federal adjusted gross income | Your federal AGI (Form 1040 line 11). |
| deps | Dependents | Dependents you claim, not yourself or your spouse. |
| itemized | State itemized deductions | Used if above the standard deduction. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| total | Montana income tax | State tax after credits, plus any local tax. |
| stateTax | State income tax | State tax after credits. |
| effectiveRate | Effective rate | Tax as a percent of AGI. |
| marginalRate | State marginal rate | State rate on the next dollar. |
| taxableIncome | State taxable income | AGI less deduction and exemptions. |
| deduction | Deduction | Standard or itemized, whichever is larger. |
| exemptions | Exemptions | Personal and dependent exemptions. |
| credits | Credits | State credits used. |

## Method

Taxable income = AGI − larger of standard or itemized deduction − exemptions; tax = state rates on taxable income − credits.

## Assumptions

- An estimate for a full-year resident, 2026 rates, not tax advice.
- Starts from federal AGI; Montana additions and subtractions are not modelled.
- Not modelled for Montana: Montana starts from federal taxable income. Lower capital gains rates are not modelled.
- Not modelled: part-year and nonresident returns, other state credits, and state AMT.

## Worked examples

1. status = single, income = $50,000.00, deps = 0 gives taxableIncome = $33,900.00, stateTax = $1,593.30, total = $1,593.30. Source: Montana DOR, Publication 1 2026 (brackets, federal standard deduction), https://revenuefiles.mt.gov/files/Forms/Publication-1/Publication-1-2026.pdf (worked from it at AGI $50,000, single).
2. status = mfj, income = $100,000.00, deps = 2 gives taxableIncome = $67,800.00, stateTax = $3,186.60, total = $3,186.60.
3. status = hoh, income = $200,000.00, deps = 1 gives taxableIncome = $175,850.00, stateTax = $9,258.65, total = $9,258.65.

## FAQ

### What is the Montana income tax rate?

Montana taxes income at 4.7% to 5.65% in 2 brackets (single filers). For a single filer the schedule is 4.7% from $0, 5.65% above $47,500 of taxable income. These are the 2026 rates.

### How is Montana income tax calculated?

Start from federal adjusted gross income. Subtract the larger of the Montana standard deduction and your itemized deductions, then the exemptions. Apply the rates to what is left and subtract any credits. Montana uses the federal standard deduction ($16,100 single, $32,200 joint, $24,150 head of household for 2026). The model has no exemptions or credits for this state.

### Does Montana have a local income tax?

This page has no local income tax for Montana; if your city or county has one, add it yourself.

### What does this Montana calculator leave out?

Montana starts from federal taxable income. Lower capital gains rates are not modelled. It also leaves out state additions and subtractions to federal AGI (such as retirement or Social Security exclusions), part-year and nonresident returns, and credits such as child care, earned income, and tax paid to another state.

### Which tax year do the Montana rates cover?

Tax year 2026, the return you file in 2027. They come from Montana DOR.

### Which states have no income tax on wages?

Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. They have no page of their own, because there is no wage income tax to work out; the state income tax calculator answers 0 for them. Federal income tax and Social Security and Medicare still apply.

### Is this the same as my paycheck withholding?

No. This is the tax for the whole year on your return. Your employer withholds by the state's own withholding formula, so your refund or balance due is the difference between the two.

## Sources

- Montana DOR, Publication 1 2026 (brackets, federal standard deduction), https://revenuefiles.mt.gov/files/Forms/Publication-1/Publication-1-2026.pdf