Income tax; modifying calculation of the Oklahoma earned income tax credit. Effective date.

SB 52 changes Oklahoma's Earned Income Tax Credit (EITC) to be 5% of the federal EITC amount for tax years starting in 2022. It clarifies that the state credit calculation uses the same federal rules as the federal EITC (except for the fixed 5% rate) and ensures any excess credit beyond state tax liability is refunded. The bill also limits the maximum credit to the portion of the federal credit corresponding to the taxpayer's Oklahoma income relative to their federal income. This affects Oklahoma residents who qualify for the federal EITC and claim the state credit, potentially altering their refund amounts.