Montana Income Tax Calculator 2026 โ 4.7% and 5.65% Brackets
Calculate your 2026 Montana state income tax with two brackets (4.7% and 5.65%), income-based standard deduction, capital gains credit, and MT vs WY, ID, ND comparison.
Montana Tax Bracket Breakdown
| Income Range | Taxable in Bracket | Rate | Tax |
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Full Tax Computation Summary
How to Use This Montana Income Tax Calculator
Enter your annual gross income (which equals your Montana AGI), select your filing status, and optionally enter any net capital gains from Montana sources. The calculator applies Montana's 2026 income-based standard deduction and two-bracket rate structure, then shows your state and federal tax together.
The Formula
MT Taxable Income = AGI − MT Standard Deduction
MT Gross Tax = $21,600 × 4.7% + max(0, taxable − $21,600) × 5.65%
Capital Gains Credit = Net Capital Gains × 2%
MT Tax Owed = MT Gross Tax − Capital Gains Credit
Example: Single filer, $85,000 income
Standard deduction: 20% × $85,000 = $17,000 → capped at $5,660
MT taxable income: $85,000 − $5,660 = $79,340
MT tax: $21,600 × 4.7% + $57,740 × 5.65% = $1,015 + $3,262 = $4,277
MT effective rate: 5.03%
No Sales Tax Advantage
Montana is one of only five states with no sales tax. For a household spending $40,000/year on taxable goods at a typical 7% sales tax rate, this saves $2,800 annually compared to neighboring states. When combined with Montana's relatively moderate income tax rates, total tax burden often compares favorably.
MT vs Neighboring States Comparison
Side-by-side Montana, Wyoming, Idaho, and North Dakota tax comparison at your income level
State income tax at your current income level. Single filer, no deductions other than standard, for apples-to-apples comparison.
| State | Tax Structure | State Tax | Effective Rate | After-State Income |
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Note: Wyoming and North Dakota have no or very low income tax but may have higher property taxes. All states except Montana, Oregon, and New Hampshire have sales tax.
Montana state tax at common income levels for the selected filing status.
| Income | Std Deduction | MT Taxable | MT Tax | Effective Rate |
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