Montana Self-Employed Tax Guide for 2026
Montana rewrote its income tax in 2024, and the 2026 version is the cleanest it has ever been: two brackets, and a starting point borrowed straight from your federal return. For self-employed Montanans that's mostly good news — but it also means a mistake on your federal Schedule C now flows directly into your state bill. Here's how to get the 2026 numbers right.
Two brackets: 4.7% and 5.65%
For 2026 Montana taxes the first roughly $21,100 of taxable income (single) at 4.7% and everything above it at 5.65%, after the 2025 cut from 5.9%. Joint filers get double-width brackets. Because the top bracket starts low, most full-time gig workers have some profit taxed at 5.65%, but their effective rate usually lands around 3.5% to 4.8%.
Montana now starts from federal taxable income
Since 2024 Montana begins with federal taxable income instead of its own adjusted gross income. That means the federal standard deduction, the deductible half of self-employment tax, and every Schedule C expense carry over automatically. The flip side: if you under-claim mileage federally, you overpay Montana too.
Quarterly estimates with Form ESW
Montana requires estimated payments if you expect to owe $500 or more after withholding. Form ESW payments are due April 15, June 15, September 15, 2026, and January 15, 2027. You can pay through the Montana TransAction Portal (TAP) the same day you send your federal 1040-ES.
No city income tax — resort taxes don't count
No Montana city levies an income tax. Whitefish, Big Sky, West Yellowstone and a few other resort towns charge resort taxes on retail sales and lodging, which raise costs for visitors but never touch your income tax return.
Deductions that move the needle
Montana's distances make mileage huge. At 72.5¢ per mile for January–June and 76¢ for July–December 2026, an 18,000-mile year is roughly $13,365 off your profit. Rural drivers should log every business mile from home, including dead miles between gigs, plus phone, platform fees, and cold-weather supplies used for work.
How much to set aside
A Montana gig worker should plan on 25% to 30% of net profit. Plug in your income and miles with the Montana self-employed tax calculator for a precise number.
Frequently asked questions
+What is Montana's income tax rate for self-employed workers in 2026?
Two brackets: 4.7% on lower taxable income and 5.65% above roughly $21,100 for single filers. Most full-time gig workers pay an effective Montana rate around 3.5% to 4.8%.
+Do Billings or Missoula have a city income tax?
No. No Montana city levies an income tax. Resort-town taxes are sales taxes, not income taxes.
+When are Montana estimated taxes due?
Form ESW payments are due April 15, June 15, September 15, 2026 and January 15, 2027 if you expect to owe $500 or more.
+Does Montana use my federal deductions?
Yes. Montana now starts from federal taxable income, so the federal standard deduction and your Schedule C expenses carry over automatically.
+How much should a Montana gig worker set aside?
About 25% to 30% of net profit covers the 15.3% SE tax, federal income tax and Montana's state tax.
Ask about this article
Answers are grounded in “Montana Self-Employed Tax Guide for 2026”. Educational info, not tax advice.
About the author
Javed Niamat · Founder & Editor, GigTax
Javed Niamat founded GigTax to make self-employment tax math understandable for rideshare drivers, delivery couriers, creators and freelancers. He builds and maintains every calculator on this site and writes the guides that explain the numbers behind them.
Related calculators
- Self-Employed Tax EstimatorEstimate federal, SE, and state tax for your full 1099 year.
- Quarterly Tax CalculatorEstimate your four IRS quarterly payments and avoid underpayment penalties.
- Estimated Tax Payment CalculatorCompute each Form 1040-ES estimated payment.
- Etsy Tax Calculator1099-K gross sales, Etsy fees, COGS and shipping for handmade sellers.
Related guides
- Idaho Self-Employed Tax Guide for 20262026 guide: Idaho self-employed tax explained. Estimate federal income tax, 15.3% SE tax and Idaho's 5.3% flat state tax on 1099 income, with Form 51 deadlines.
- Wyoming Self-Employed Tax Guide for 20262026 guide: Wyoming self-employed tax explained. Wyoming has no state income tax, so estimate the federal income tax and 15.3% SE tax you owe on 1099 income.
- Alaska Self-Employed Tax Guide for 20262026 guide: Alaska self-employed tax explained. No state income tax — estimate federal income tax and 15.3% SE tax on 1099 income, plus how your PFD is taxed.
- Quarterly Tax Deadlines Explained: The 2026 Form 1040-ES CalendarThe 2026 IRS quarterly tax deadlines for 1099 workers: April 15, June 15, September 15, and January 15, 2027. Safe-harbor rules, penalties, and how to pay.