Quarterly Estimated Tax Calculator — Montana (2026)
If you earn income in Montana without withholding — freelancing, contracting, rentals, dividends — the IRS expects payment four times a year, not once. This calculator turns your expected 2026 net profit into a per-quarter number covering self-employment tax, federal income tax and Montana state tax. Montana uses a progressive income tax with 2 brackets running from 4.70% up to 5.90%, applied after a state standard deduction of $16,100.
Montana Quarterly Tax Calculator
Gross 1099 income minus business expenses.
2026 due dates and safe harbor
Federal estimated payments are due April 15, June 15, September 15 of 2026 and January 15 of 2027. You avoid penalties by paying either 90% of the current year's liability or 100% of last year's (110% if prior-year AGI exceeded $150,000) — the safe-harbor rule.
Montana runs its own estimated-payment schedule that usually mirrors the federal dates. On $90,000 of net profit the Montana portion alone is about $935 per quarter.
Underpayment penalties
The IRS charges interest-style penalties per quarter you fall short, currently around 7–8% annualized. Paying late in the year does not fix an early-quarter shortfall unless you use the annualized income method on Form 2210.
Irregular income is common in energy work around Billings: if Q1 is slow and Q4 is huge, the annualized method usually beats four equal payments.
Paying as a Montana taxpayer
Pay federally through IRS Direct Pay or EFTPS, and Montana through the state revenue department's online portal — keep confirmation numbers for both.
Montana has no state sales tax — one of only five US states without a general sales tax.
Local and payroll taxes Montana adds on top
Montana adds no state-mandated employee payroll deduction beyond FICA, so nothing extra is taken from your gross pay at the state level.
Montana has no state sales tax — one of only five US states without a general sales tax.
Nobody withholds these for you when you are self-employed in Montana. Local wage taxes, city business licences and gross-receipts style levies are yours to register for and remit alongside your quarterly federal and state estimates.
Working across a state line from Montana
Montana holds income-tax reciprocity agreements with North Dakota. If you commute between them, your wages are taxed only by your state of residence — file the exemption certificate with your employer so the wrong state is not withheld from every paycheck.
Remote and hybrid work complicates this further: most states tax income where the work is physically performed, so a Billings resident spending part of the year at a client site in Wyoming may owe a nonresident return there. Keep a day-count log if you split time between states.
The rest of your Montana tax bill
Montana charges no general sales tax, homeowners pay an average effective property tax of 0.74% of market value, and the minimum wage in force during 2026 is $10.85 an hour.
No general sales tax; some resort towns levy a local option tax.
Income tax is only one part of a state's take. Montana recovers revenue through sales and property tax as well, which is why headline income tax rates alone are a poor guide to how far a salary really goes. Montana taxes most retirement income, including Social Security above federal thresholds, with a modest subtraction at 65+.
Montana vs Wyoming on the same salary
On a $90,000 salary, a single filer keeps about $68,031 a year in Montana against roughly $72,145 in Wyoming — a difference of $4,114, or $343 a month.
Effective combined rates are 24.4% in Montana and 19.8% in Wyoming. Set that gap against living costs: index 102 here versus 96 there, with property tax at 0.74% and 0.61% respectively.
Montana income tax brackets 2026 (single filer)
| Taxable income | Rate |
|---|---|
| $0 – $20,500 | 4.70% |
| $20,500 and up | 5.90% |