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Montana Income Tax (2026)

Info: Graduated, topping out at 5.65% in 2026 (down from 5.9%); the lower 4.7% rate applies up to $47,500 single / $95,000 joint.

InfoVerified May 31, 2026

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Graduated, topping out at 5.65% in 2026 (down from 5.9%); the lower 4.7% rate applies up to $47,500 single / $95,000 joint. No state sales tax.

Official source: revenue.mt.gov →

General legal information, not legal advice — verify important decisions with a licensed attorney.

Income Tax in states bordering Montana

The same rule in each neighboring state LawLert has verified, from that state’s own official source.

IdahoInfo
Flat 5.3% for 2026 (the first ~$4,800 single / $9,600 married is taxed at 0%).
Verified May 31, 2026 · Source: tax.idaho.gov · Full Idaho rule →
North DakotaInfo
Graduated with a low 2.50% top rate for 2026 (brackets from 0% up to 2.50%).
Verified May 31, 2026 · Source: tax.nd.gov · Full North Dakota rule →
South DakotaPermitted
No state individual income tax — 0% on wages and all personal income.
Verified May 31, 2026 · Source: dor.sd.gov · Full South Dakota rule →
WyomingPermitted
No state individual income tax — 0% on wages and all personal income. No statute imposes one; Wyo. Const. art. 15, § 18 requires full credit for sales, use, and ad valorem taxes against any income tax, which has effectively kept Wyoming income-tax-free.
Verified Aug 4, 2026 · Source: wyoleg.gov · Full Wyoming rule →

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