Montana State Income Tax 2024. Legislation to simplify montana’s tax laws went into effect on january 1, 2024. Montana's 2024 income tax ranges from 1% to 6.75%.
Back in 2021, the montana legislature approved a major overhaul to the state income tax structure, with the most significant adjustments set to take effect at the. Major changes are coming to montana’s income tax system beginning in tax year 2024, including changes to filing statuses, tax brackets, and the calculation of montana taxable income.