Montana tax tables 2026
The figures set by or for Montana for 2026: income tax brackets, payroll contributions and employer rates. Federal or national figures for the US are on the national page.
- 2026-01-01 to 2026-12-31
- USD
Income tax
Montana income tax brackets: Single and married filing separately
| State taxable income, per year | Rate |
|---|---|
| $0 to $47,500 | 4.7% |
| Over $47,500 | 5.65% |
Source: Montana Department of Revenue, HB337: 2026–2027 Montana Individual Income Tax Changes (November 14, 2025) · retrieved 2026-10-16
Montana income tax brackets: Married filing jointly and surviving spouse
| State taxable income, per year | Rate |
|---|---|
| $0 to $95,000 | 4.7% |
| Over $95,000 | 5.65% |
Source: Montana Department of Revenue, HB337: 2026–2027 Montana Individual Income Tax Changes (November 14, 2025) · retrieved 2026-10-16
Montana income tax brackets: Head of household
| State taxable income, per year | Rate |
|---|---|
| $0 to $71,250 | 4.7% |
| Over $71,250 | 5.65% |
Source: Montana Department of Revenue, HB337: 2026–2027 Montana Individual Income Tax Changes (November 14, 2025) · retrieved 2026-10-16
Montana income tax: key figures
| Item | Value |
|---|---|
| Type | Progressive brackets |
| Top rate | 5.65% |
| Standard deduction: SingleFederal standard deduction (single or married filing separately) | $16,100 |
| Standard deduction: Married filing jointlyFederal standard deduction | $32,200 |
| Standard deduction: Head of householdFederal standard deduction | $24,150 |
Source: Montana Department of Revenue, HB337: 2026–2027 Montana Individual Income Tax Changes (November 14, 2025) · retrieved 2026-10-16
Employee contributions
Montana supplemental (bonus) withholding
| Item | Value |
|---|---|
| Supplemental rate | 5% |
Source: Montana Department of Revenue, Montana Employer and Information Agent Guide (V4 November 2025) — Supplemental Wages · retrieved 2026-10-16
Employer costs
Montana state unemployment insurance (employer)
| Item | Value |
|---|---|
| Taxable wage base (per employee, per year) | $47,300 |
| New employer rate | Set by industry |
| Experience-rated range: lowest | 0% |
| Experience-rated range: highest | 6.12% |
Montana assigns new employers a rate by industry, plus a 0.18% Administrative Fund Tax. Enter the total rate from your state rate notice.
Source: Montana Department of Labor & Industry, Unemployment Insurance Contributions Bureau, Rate Explanation (2026) · retrieved 2026-10-20
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Official sources
- Montana Employer and Information Agent Guide with Montana Withholding Tax Tables (V4 November 2025) · retrieved 2026-10-16
- Updated Montana Wage Withholding Tables and MW-4 Now Available (December 8, 2025) · retrieved 2026-10-16
- HB337: 2026–2027 Montana Individual Income Tax Changes · retrieved 2026-10-16
- Rev. Proc. 2025-32 (2026 inflation adjustments) · retrieved 2026-10-16
- Montana Department of Labor & Industry, Unemployment Insurance Contributions Bureau, Rate Explanation (2026) · retrieved 2026-10-20
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