How is Montana income tax calculated?

Montana uses a progressive income tax system — higher incomes are taxed at higher marginal rates. Your income is divided into brackets, and each portion is taxed at the corresponding rate. Use the Bracket Breakdown tab above for a detailed breakdown of your specific situation.

What is the Montana income tax rate for 2026?

Montana has multiple tax brackets for 2026. The rates vary depending on your income level and filing status. See the Bracket Breakdown tab above for the exact rates and thresholds that apply to your income.

What is the difference between marginal and effective Montana tax rate?

Your marginal rate is the rate on your last dollar of income. Your effective rate is the average rate across all your income — total tax divided by total income. The effective rate is almost always lower than the marginal rate due to the progressive bracket structure.

How can I reduce my Montana income taxes?

Common strategies include maximizing pre-tax retirement contributions (401k, traditional IRA), contributing to an HSA if eligible, claiming all deductions you qualify for, and timing income or deductions strategically. Consult a qualified tax professional for personalized advice.

Does Montana have a standard deduction?

Yes. Montana allows a standard deduction of $14,600 for single filers and $29,200 for married filing jointly in 2026.

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Montana Income Tax Calculator

Calculate your 2026 Montana state income tax. See your bracket breakdown, effective rate, and how Montana compares to neighboring states.

Quick presets:

Your Tax Inputs

Annual Gross Income

Filing Status

Pre-Tax Deductions (401k, HSA, etc.)

State Deduction Method

Itemized Deductions

Number of Dependents

State Income Tax

Montana · 2026

State Taxable Income

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Effective Rate

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Marginal Rate

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State Tax

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Est. Take-Home

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Monthly Take-Home

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Weekly Take-Home

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vs National Average Effective Rate (4.2%)

Effective Rate vs Neighboring States

Montana Tax Brackets (2026)

Federal vs Montana Tax Comparison

Estimate for your income and filing status. Federal uses 2026 brackets and standard deduction.

Item	Federal	Montana	Total

About Montana state taxes (Tax year 2026)

Montana has a progressive income tax with 2 brackets: 4.7% and 5.9%. Montana is one of five states with no sales tax, which partially offsets its above-average income tax rates.

Montana has no state or local sales tax. Some resort communities may charge a small local resort tax.

Montana's top rate of 5.9% is above the national average, but the complete absence of sales tax makes its overall tax burden moderate compared to most states.

Filing in Montana: returns for tax year 2026 are administered by the Montana Department of Revenue and are generally filed in 2027 by the federal April deadline unless Montana declares a state-specific extension. Tax type on this return: Progressive. Top marginal rate: 5.9%. State sales-tax rate: 0%. For the most current contact info, see the Federation of Tax Administrators directory.

Montana — What is Montana's income tax rate? Montana has two income tax brackets: 4.7% on the first $20,500 and 5.9% on income above that for single filers.

Montana — Does Montana have a sales tax? No, Montana has no state or local sales tax. It is one of five states with no sales tax. Some resort areas may charge a small local resort tax on lodging and restaurants.

Montana — How does Montana fund its government without sales tax? Montana relies on income taxes, property taxes, resource extraction taxes (mining, oil, gas), and various fees to fund state and local government services.

Reviewed methodology

How this page is reviewed

Risk tier	High YMYL
Author	Calculover Editorial Team Tax education
Editorial owner	Calculover Tax & Payroll Desk State-tax methodology owner
Reviewer	Calculover Editorial Review Government-source and limitation review
Last reviewed	2026-05-14
Last verified	2026-05-14
Data effective date	2026-01-01
Jurisdiction	Montana

Methodology

State-tax per-state pages apply the published 2026 bracket schedule, standard deduction, and filing-status rules for the listed jurisdiction. Federal AGI inputs are mapped to state taxable income before bracket math runs. Local taxes (NYC, Philadelphia, certain Ohio cities) are flagged but not embedded in the base estimate.

Assumptions

The user enters federal AGI, filing status, and state-specific adjustments as provided.
Brackets, standard deductions, and credits reflect the 2026 statutory values published by the state Department of Revenue and the Tax Foundation.
Local income taxes and reciprocity-agreement situations are noted but not auto-applied.

Limitations

These pages do not predict mid-year legislative changes, rate adjustments, or new local tax assessments.
Multi-state filers, convenience-of-employer rules, and special-circumstance credits require additional tax-professional analysis.

Sources

State Tax Rates, Federation of Tax Administrators
State Individual Income Tax Rates and Brackets, Tax Foundation
State Government Resources, Internal Revenue Service

Professional guidance: This page is for state-tax education only and is not tax, legal, financial, or investment advice. State tax decisions and multi-state filing should be reviewed with a CPA or enrolled agent licensed in the relevant states.