United States · State income tax
Montana state income tax rate 2027.
Montana’s bracket schedule from the official source, with the 2026 figures and a statutory 2027 column.
Short answer: Montana has 2 brackets for 2026 with rates from 4.7% to 5.65%. The top rate starts at $47,500 of taxable income for single filers and $95,000 for joint filers. State law already fixes different 2027 rates, which are shown below and used in the 2027 result.
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Result
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The Montana schedule
Montana DOR HB 337 page, 'Tax Year 2026' table: 4.7% on $0-$47,500 and 5.65% over $47,500 for single/MFS; 4.7% to $95,000 and 5.65% over $95,000 for MFJ and surviving spouse. Dollar edges are as printed by DOR (statutory under HB 337). Table notes taxable income excludes long-term capital gains (taxed separately).
Single filers
| Taxable income | Rate, 2026 | Rate, 2027 (enacted) |
|---|---|---|
| $0 to $47,500 | 4.7% | 4.7% |
| $47,500 to $65,000 | 5.65% | 4.7% |
| Over $65,000 | 5.65% | 5.4% |
Joint filers
| Taxable income | Rate, 2026 | Rate, 2027 (enacted) |
|---|---|---|
| $0 to $95,000 | 4.7% | 4.7% |
| $95,000 to $130,000 | 5.65% | 4.7% |
| Over $130,000 | 5.65% | 5.4% |
Deductions, exemptions and local tax
Montana’s standard deduction, exemption and credit amounts are not stated here because they were not read from the Montana tax agency’s own pages on November 9, 2026. Use the state’s current return instructions. None of them is modelled.
None; Montana has no local income tax. Long-term capital gains are excluded from the bracket table and taxed under separate rates; not modelled.
What changes in 2027 (projected)
Same DOR HB 337 page, 'Tax Year 2027' table: 4.7% to $65,000 single / $130,000 MFJ, then 5.4%.
The 2027 column above uses the rates enacted in law. Any indexed dollar edges that the state has not yet published are not invented here.
Worked example (2026 schedule)
A single filer with $80,000 of Montana taxable income owes $4,069 under the 2026 schedule, an effective rate of 5.09% and a marginal rate of 5.65%. A joint filer with $150,000 of Montana taxable income owes $7,573 under the 2026 schedule, an effective rate of 5.05% and a marginal rate of 5.65%. For 2027 the enacted rates give $3,865 for the single example (4.83% effective) and $7,190 for the joint example (4.79% effective).
Common mix-ups
- Montana's top rate is still 5.9% over about $20,500. HB 337 changed it: 5.65% over $47,500 single / $95,000 joint for 2026.
- Montana rates stay the same in 2027. For 2027 the top rate falls to 5.4% and the 4.7% band widens to $65,000 single / $130,000 joint.
- Joint brackets are narrower than double single. For Montana they are exactly double: $95,000 vs $47,500 (2026) and $130,000 vs $65,000 (2027).
- Capital gains are taxed in these brackets. The DOR table states taxable income does not include long-term capital gains.
Method
The tool applies each bracket rate only to the slice of income inside that bracket, adds the slices and divides by income for the effective rate; the marginal rate is the rate of the bracket that contains your income. The 2027 line uses the enacted 2027 rates. Nothing you type is sent to our servers; the maths runs in your browser. For a full paycheck including federal and payroll taxes, use the paycheck calculator, and for comparing states see the state income tax calculator.
What this does not cover
- Deductions, exemptions and credits. Enter income after them.
- Head of household, part-year or nonresident returns, and income taxed at special rates.
- Local income taxes and surtaxes beyond the bracket schedule (see the section above).
- Any 2027 law change that has not been enacted yet.
Figures read from the sources below on November 9, 2026. Last updated November 9, 2026.
Sources
- Montana DOR: HB 337 individual income tax changes (2026 and 2027 rate tables) (retrieved November 9, 2026)
Frequently asked questions
What is the Montana state income tax rate for 2027?
Montana law already sets 2027 rates. Same DOR HB 337 page, 'Tax Year 2027' table: 4.7% to $65,000 single / $130,000 MFJ, then 5.4%. The 2027 column and result on this page use them.
What is the top Montana income tax rate?
5.65% under the 2026 schedule. It starts at $47,500 of taxable income for single filers and $95,000 for joint filers.
How much Montana income tax would I pay on $80,000?
A single filer with $80,000 of Montana taxable income owes $4,069 under the 2026 schedule, an effective rate of 5.09% and a marginal rate of 5.65%. The estimator above runs your own figure.
Does this page include deductions or credits?
No. It applies the rate schedule to the taxable income you enter, so subtract your deductions and exemptions first. It does not model credits, local taxes or surtaxes.
Is the 2027 result a forecast?
It uses the 2027 rates already written into Montana law, so it is not a guess about rates, but the state can still amend them and the dollar edges may be indexed. Check the Montana tax agency before you file.
Where does the information on this page come from?
Montana sources read on November 9, 2026: Montana DOR: HB 337 individual income tax changes. The links in the Sources section go to the originals.
What changes in Montana in 2027?
Under HB 337 the top rate becomes 5.4% and the 4.7% bracket widens to $65,000 single / $130,000 joint.
Not legal or tax advice
Rates change and this is an unofficial guide, not run by any state tax agency; any 2027 figure that is not enacted is a projection. Nothing you type is transmitted anywhere. Confirm with the Montana tax agency or a tax professional before you file.