Comprehensive statutory analysis of Montana individual income tax rates, Department of Revenue filing forms, extension guidelines, telecommuting sourcing rules, and pass-through entity tax provisions.
Primary Resident FormForm 2 (Montana Individual Income Tax Return)
Nonresident FormForm 2 (Schedule NR for Nonresidents)
Convenience of Employer RuleNo
Reciprocity AgreementsND
Community Property StateCommon Law
State Estate/Inheritance TaxNone (Federal Only)
QSBS IRC § 1202 ConformityState Specific / Under Review
Marginal Rate Ladder: Montana
Source: Tax Foundation — State Individual Income Tax Rates and Brackets, 2026 (retrieved 2026-08-09). Ranks Montana against all 51 jurisdictions.
2026 Legislative & Statutory Highlights
Montana modernized its tax code (SB 399), establishing a 2-bracket progressive structure with rates of 4.7% and 5.9%, using federal taxable income as the starting calculation base. Montana imposes no state general sales tax.
Montana operates a graduated personal income tax schedule with marginal brackets reaching up to 5.7%. Tax parameters are indexed annually or enacted through state legislative sessions. Taxpayers should ensure that adjustments for federal bonus depreciation, Section 179 expensing, and Net Operating Loss (NOL) carryforwards follow Montana's specific rolling or static Internal Revenue Code conformity date.
Filing Forms, Deadlines & Extension Guidelines
Full-Year Resident ReturnForm 2 (Montana Individual Income Tax Return)
Nonresident / Part-Year ReturnForm 2 (Schedule NR for Nonresidents)
Statutory Filing Calendar & Extension Provisions:Automatic 6-month extension to October 15, provided 100% of tax liability is paid by April 15.
Montana taxes residents on worldwide income. Nonresidents performing services inside Montana are subject to Montana withholding. Montana has a reciprocal agreement with North Dakota.
Cross-Border Tax Credits:If you are an Montana resident earning wages in another state that also levies income tax, Montana generally permits a resident credit for taxes paid to other jurisdictions (subject to statutory percentage limitations) to avoid unconstitutional double taxation.
Pass-Through Entity (PTE) Tax & Small Business Rules
Montana enacted an elective Pass-Through Entity Tax allowing partnerships and S-corps to pay tax at the 5.9% rate at the entity level.
Estate & Inheritance Tax
Montana imposes no state estate tax and no inheritance tax.
Local & County Taxes
Montana local governments do not impose local personal income taxes.
Worked Tax Example: $120,000 W-2 Earner in Montana
A single filer in Bozeman earning $120,000 pays approximately $5,890 in Montana state income tax, reflecting an effective state rate of 4.91%.
Gross W-2 Wages$120,000
Est. State Tax$5,890
Effective State Rate4.91%
Calculate Your 2026 Montana Tax Liability
Enter your taxable income, filing status, and municipal details below to calculate your customized state tax liability and print your executive summary.
Structure
graduated
Top rate
5.7%
State tax
$4,324
Eff. rate (state+local)
5.4%
2-bracket system, top marginal 5.65% (Tax Foundation). 2026 upper threshold (~$20,600 single) inflation-indexed — verify against MT DOR. Reciprocity with ND.
⚠ Some figures for this state are not yet fully verified — confirm with the state Department of Revenue before relying on them.
Official Executive Tax Dossier · Form 1040 Statutory Mapping
2026 Executive Montana State Tax Audit Summary
STATUTORY SEAL:FT-2026-IRS-45169EBDIRS Rev. Proc. 2025-32 Verified
Gross Income$80,000
Taxable Income$80,000
Total Combined Tax$4,324
Effective Total Rate5.4%
Statutory Governing Authority: Montana Department of Revenue Statutory Tax Code · Top Marginal Rate: 5.7% · Tax Foundation 2026 State Tax Rates & Brackets Report
Not tax, legal, or financial advice
FiscTalk provides general educational information from public sources. Your tax results depend on the full set of facts, your filing history, and the jurisdiction-specific rules that shift yearly. Before filing or making decisions, consult a licensed CPA, EA, or attorney. FiscTalk is not a fiduciary and is not affiliated with the IRS or any state agency.
Does Montana have a state personal income tax in 2026?
Yes. Montana operates a graduated personal income tax schedule with marginal brackets reaching up to 5.7%. Taxpayers must file an annual return if gross income exceeds statutory filing thresholds.
What is the 2026 individual income tax filing deadline for Montana?
The regular filing deadline for Montana individual income tax returns is April 15, 2026. Taxpayers seeking an extension may receive up to 6 additional months to file, but any tentative tax due must be paid by the original deadline to prevent late-payment interest and statutory penalties.
How does Montana treat remote workers and telecommuters?
Montana taxes residents on worldwide income. Nonresidents performing services inside Montana are subject to Montana withholding. Montana has a reciprocal agreement with North Dakota.
Can small business owners in Montana bypass the federal $10,000 SALT cap?
Montana enacted an elective Pass-Through Entity Tax allowing partnerships and S-corps to pay tax at the 5.9% rate at the entity level.
Does Montana impose a separate estate or inheritance tax?
Montana imposes no state estate tax and no inheritance tax.
Source-verified — not professional advice
Every figure on this page is checked in-house against its primary source — IRS revenue procedures and publications, state Departments of Revenue, and the text of the underlying statute — before publication. Last reviewed 2026-10-20. The full source list is at the bottom of this page. If you spot an error, see our corrections & standards policy.
Not tax, legal, or financial advice
FiscTalk provides general educational information from public sources. Your tax results depend on the full set of facts, your filing history, and the jurisdiction-specific rules that shift yearly. Before filing or making decisions, consult a licensed CPA, EA, or attorney. FiscTalk is not a fiduciary and is not affiliated with the IRS or any state agency.