Colorado State Income Tax Brackets 2025 Tax Bracket. Beginning in tax year 1987, the state legislature simplified the state income tax by enacting a single, or “flat,” tax rate applied universally across all income brackets. This page has the latest oklahoma brackets and tax rates, plus a oklahoma income tax calculator.
Calculate your total tax due using the co tax calculator (update to include the 2025/25 tax brackets). Income tax tables and other tax information is sourced from the oklahoma.
