Income tax; modifying rate for certain corporations for certain tax years. Effective date.

SB 323 amends Oklahoma's individual income tax code to establish new tax rates for tax years beginning January 1, 2024. It directly affects Oklahoma residents and nonresidents filing individual income tax returns. The bill creates a tiered rate structure: for single filers and married filing separately, it sets rates from 0.25% on the first $1,000 up to 4.75% on income above $6,200. This replaces prior rates (which had a top rate of 5.50% for 2008-2008), reducing the highest marginal tax rate for most filers.