Montana Income Tax 2026
Montana has a graduated income tax for 2026. The standard deduction is $16,100 (single) / $32,200 (married filing jointly). Two-bracket graduated tax on ordinary income (incl. wages) under HB 337 (2025 session), effective tax year 2026. Top marginal rate cut from 5.9% (2025) to 5.65% in 2026; scheduled to fall further to 5.4% in 2027. Lower 4.7% bracket: Single/MFS up to $47,500, MFJ up to $95,000, Head of Household up to $71,250. Since the SB 399 reform Montana starts from federal taxable income and no longer computes its own standard deduction, so it effectively uses the federal standard deduction; Tax Foundation 2026 lists $16,100 single / $32,200 MFJ (matches 2026 federal amounts). No personal exemption. No local/city income taxes in Montana. Long-term capital gains taxed at separate, lower rates (3.0% / 4.1%), NOT in the ordinary-income brackets above. Montana exempts a portion of Social Security per federal taxability rules. Montana EITC increases to 20% of the federal EITC beginning tax year 2026.
Montana tax brackets (single, 2026)
| Taxable income | Rate |
|---|---|
| $0 - $47,500 | 4.70% |
| $47,500+ | 5.65% |
Tax on common incomes in Montana (2026, single)
| Income | State tax | Take-home |
|---|---|---|
| $20,000 | $183 | $17,897 |
| $25,000 | $418 | $21,779 |
| $30,000 | $653 | $25,632 |
| $35,000 | $888 | $29,414 |
| $40,000 | $1,123 | $33,197 |
| $45,000 | $1,358 | $36,979 |
| $50,000 | $1,593 | $40,762 |
| $55,000 | $1,828 | $44,544 |
| $60,000 | $2,063 | $48,327 |
| $65,000 | $2,312 | $52,096 |
2026 figures. Source: Montana Department of Revenue + Tax Foundation. Not tax advice.