Revenue and taxation; Oklahoma taxable income and adjusted gross income; OSHA; consultation; effective date.

HB 4064 modifies Oklahoma's tax calculation rules for income tax purposes. It adjusts how state tax liability is calculated by adding state/local interest income not federally exempt, deducting amounts federal law prohibits taxing, and changing how businesses can carry forward net operating losses (e.g., limiting loss carrybacks to two years for certain tax years). These changes apply directly to Oklahoma taxpayers, including both individuals and corporations, when filing state income tax returns. The bill updates existing tax code provisions to align with federal rules and clarify income allocation methods.