Montana Quarterly Tax Calculator 2026
Rates reviewed · Montana Department of Revenue
Montana has a top income tax rate of 6.9%. Quarterly estimated payments required if you expect to owe $500 or more.
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Tax Information Notice
This content is for informational and educational purposes only. It does not constitute tax, legal, or financial advice. Tax laws change frequently. Always consult a qualified CPA or Enrolled Agent for your specific situation.
Montana quarterly tax questions
How much is the quarterly tax for freelancers in Montana?
Freelancers in Montana pay federal self-employment tax (15.3% of net self-employment income), federal income tax at their bracket, and Montana income tax of up to 6.9%. This calculator applies 6.9% as a representative Montana rate for freelancer-level income; the top marginal rate is 6.9%.
When are quarterly estimated taxes due in Montana for 2026?
Montana follows the federal estimated tax schedule for 2026 — Q1: April 15, 2026, Q2: June 16, 2026, Q3: September 15, 2026, Q4: January 15, 2027. The Q3 payment is due September 15, 2026.
Do I have to make Montana estimated tax payments?
Montana requires estimated payments once you expect to owe $500 or more in state income tax for the year. The state form is Form IT-ES. Payments can be made online through TransAction Portal. Filing and paying federal estimated tax does not cover the state amount — they are separate payments.
Where do I pay Montana estimated taxes online?
Montana accepts online estimated tax payments through TransAction Portal, run by the Montana Department of Revenue. Federal payments go through IRS Direct Pay or EFTPS separately.
What happens if I underpay estimated taxes in Montana?
The IRS charges an underpayment penalty based on the amount underpaid and the number of days late. Paying at least 90% of this year's tax or 100% of last year's (110% if your AGI exceeded $150,000) meets the federal safe harbour. Montana applies its own interest and penalty on late or short state payments.
State payments are administered by the Montana Department of Revenue via TransAction Portal.
Tax Information Notice
This content is for informational and educational purposes only. It does not constitute tax, legal, or financial advice. Tax laws change frequently. Always consult a qualified CPA or Enrolled Agent for your specific situation.