Montana HB148 would exempt social security benefits from state income tax.
Montana HB148 proposes to amend state tax law to exempt social security benefits from being included in Montana taxable income. This bill revises the definition of Montana taxable income to exclude social security benefits, aligning state tax treatment with federal tax treatment. The changes would apply to income tax years beginning after December 31, 2025, with an effective date of January 1, 2026.
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