Montana taxes self-employment income through its state income tax. This calculator adds the Montana brackets on top of federal self-employment and income tax so you see one number to hold back from every payment.
Single-filer brackets applied by the calculator (doubled for married filing jointly). Source: Tax Foundation 2026 state rate survey with 2026 legislative updates.
| Taxable income (single) | Rate |
|---|---|
| $0 | 4.70% |
| over $47,500 | 5.65% |
For a single filer in Montana with $72,000 of 1099 income and $9,000 of expenses and no other income, the calculator estimates a set-aside rate of 20.4%: $8,902 of self-employment tax, $3,827 of federal income tax, and $1,995 of Montana income tax.
Federal estimated payments are due April 15, June 15 and September 15, 2026, and January 15, 2027, if you expect to owe $1,000 or more after withholding. Montana has its own estimated tax schedule and safe-harbor rules; the state share in the tracker is a quarter of the projected annual state tax.
Track it all year with the 2026 Set-Aside Tracker, which includes every state.