Montana

State Income Tax

4.7–5.9%

Rate Range

Taxable

Social Security

2026-04-15

Filing Deadline

2 brackets

Structure

Full Tax Details

Has Income TaxYes

Tax Structure2 Brackets

Rate4.7–5.9%

Single Standard Deduction$14,600

Married Standard Deduction$29,200

Single Personal ExemptionN/A

Married Personal ExemptionN/A

Taxes Social SecurityYes

Taxes Retirement IncomeYes

Filing Deadline2026-04-15

Retirement Income Details

Montana follows federal taxability of Social Security with some adjustments.

Official Payment Portal

Montana Department of Revenue

Last verified: 2026-03-31 · Always consult a tax professional before making financial decisions.