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Tax Brackets, Rates and Standard Deductions in Montana

You can prepare and e-File your 2021 Montana Income Taxes here on eFile.com together with your Federal Income Tax Return. Information on how to only file a Montana State Income Return.

Find Montana income tax forms, tax brackets and rates by tax year.

If you still need to file a return for a previous tax year, find the Montana tax forms below. You can complete and sign the forms here on eFile.com before you mail them to the MT Department of Revenue. For Federal or IRS back taxes access the tax forms here.

Below find links to other important Montana income tax return information and other related features (e.g. tax extension, amendment, etc.)

Montana Income Tax Returns

Montana Income Taxes
Prepare only a MT State Return without an IRS return. Details
Step by Step instructions on how to only Prepare and Download - not eFile - State Returns on eFile.com.
File a 2021 Montana Tax Amendment
Montana Income Tax Forms
Montana Tax Brackets, Rates explained
Current and past tax year MT Tax Brackets, Rates and Income Ranges
IRS Tax Brackets, Rates by Tax Year
Calculate and Estimate your IRS Income Tax Brackets and Rates with the eFile RATEucator.

Income Tax Brackets, Rates, Income Ranges, and Estimated Taxes Due

Here you can find how your Montana based income is taxed at different rates within the given tax brackets. When you prepare your return on eFile.com this is all calculated for you based on your income.

Montana Tax Brackets for Tax Year 2021

2021 Tax Brackets and Income ranges will be listed here as they become available.

Montana Tax Brackets for Tax Year 2020

As you can see your income in Montana is taxed at different rates within the given tax brackets. Any income over $18,700 would be taxes at the highest rate of 6.90%.

Tax Rate
Income Range
Taxes Due
$0 - $3,100
1% within Bracket
$3,100 - $5,500
2% within Bracket Less $31
$5,500 - $8,400
3% within Bracket Less $86
$8,400 - $11,300
4% within Bracket Less $170
$11,300 - $14,500
5% within Bracket Less $283
$14,500 - $18,700
6% within Bracket Less $428
$18,700 +
6.90% within Bracket Less $596

2020 Montana Standard Deductions

The Montana standard deductions did increase for Tax Year 2020.

Tax Year

Montana Income Tax Forms

Montana State Income Tax Forms for Tax Year 2021 (Jan. 1 - Dec. 31, 2021) can be e-Filed in conjunction with a IRS Income Tax Return. Details on how to only prepare and print a Montana 2021 Tax Return.

Below are forms for prior Tax Years starting with 2020. These back taxes forms can not longer be e-Filed. You can complete the forms with the help of eFile.com free tax calculators. Complete the respective Form(s) below, sign, and mail them to the Montana Department of Revenue. In addition to filing Montana Forms you might also have to file previous IRS Tax Return Forms.


A list of income tax forms for other states.