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Montana Tax Calculator

The Montana (MT) Tax Calculator is updated for the 2026/27 tax year. It estimates Montana state income tax, federal income tax, and FICA/Medicare to show your take-home pay. Montana uses a progressive state income tax system with multiple brackets and allows deductions for items like federal income tax paid, medical expenses, and mortgage interest.

This calculator supports residents, part-year residents, and nonresidents filing under Form 2, providing insight into Montana-specific deductions such as the Elderly Homeowner/Renter Credit and College Contribution Credit.

Quick Access Tools

Quick Montana Tax Calculator

Enter your annual income and filing status, then click Calculate to estimate your Montana and federal taxes. Use tabs to add dependents, itemized deductions, retirement contributions, and withholdings. Montana does not impose additional local income taxes.

Input key: F Used in Federal tax calculations S Used in State tax calculations

Quick Tax Calculation Detailed Tax Calculation
Filing Information Quick Inputs Income Details Deductions & Adjustments State Options IRA, Pensions & Annuities Withholdings

Filing Information

Set your filing status, dependants and personal details so the calculator can apply the correct Federal and State rules.

Quick Inputs

Provide a summary of your income and deductions to calculate your Federal and State tax position quickly.

Income Details

Enter the specific types of income that contribute to your Federal Adjusted Gross Income.

For Schedule B

Deductions & Adjustments

Deductions & Adjustments

Include any adjustments to income that reduce your Federal/State Adjusted Gross Income.

State Options

Some states apply local income taxes in addition to State tax. Enter your local rate if it applies.

IRA, Pensions & Annuities

Enter the details for your retirement contributions and income sources, which are used to compute values on **Form 8606**. This includes contributions to traditional IRAs, 529 savings plans, and rollovers, as well as income from rental properties, farms, unemployment, and other sources. Additionally, provide information on any disaster-related distributions or IRA rollovers you’ve made, and enter your capital gain distributions if applicable. These inputs are essential for accurately calculating your total retirement-related income and determining your tax liabilities or benefits, specifically regarding IRA deductions and distributions as outlined in **Form 8606**.

Withholdings

Enter withheld amounts to calculate refund or balance due.

How to Calculate Income Tax in Montana for 2026/27

  1. Enter your gross income and filing status.
  2. Add deductions and dependents for more accurate results.
  3. Click Calculate to view state, federal, FICA, and Medicare liabilities along with estimated take-home pay.

Advanced Options

  • Toggle itemized deductions including federal tax paid and medical expenses.
  • Add retirement contributions or tax-deferred income to refine taxable income.
  • Apply credits such as the Elderly Homeowner/Renter Credit or Energy Conservation Credit.
  • Include federal/state withholdings for refund and balance estimates.
  • Adjust dependent and childcare deductions for accurate family-based results.

Related Calculators

Additional Resources

Frequently Asked Questions

Common Montana tax questions include how to claim the Elderly Homeowner Credit, when to itemize vs. use the standard deduction, and how federal tax deductions apply on the state return.

How do I know if I need to make estimated payments?

You must pay estimated tax if you expect to owe $500 or more after withholding.

Does Montana offer energy efficiency credits?

Yes—tax credits exist for installing geothermal, solar, and other renewable systems in residential properties.

Are contributions to retirement plans deductible?

Yes—traditional 401(k) and IRA contributions reduce taxable income under Montana law.

Are gambling winnings taxable?

Yes—all gambling winnings are fully taxable in Montana.

Can I file a joint return with my spouse?

Yes—married couples can file jointly or separately, following federal filing rules.

Important Notes

All calculations are estimates for guidance only. Always review your return and consider professional advice when submitting official filings.