Revenue and taxation; Oklahoma taxable income and Oklahoma adjusted gross income; retirement income; exemption; effective date.

HB 1927 amends Oklahoma's tax code to adjust how the state calculates taxable income for individuals and corporations. It changes the rules for adjusting federal taxable income by adding state interest income not already exempt, deducting amounts the state cannot tax due to constitutional or federal restrictions, and modifying how federal net operating losses are applied (with different rules for losses carried back to different time periods). The bill specifically affects taxpayers by altering how their Oklahoma taxable income is determined based on federal calculations, particularly regarding income allocation for property, business activities, and net operating losses. These changes aim to align Oklahoma's tax calculations more precisely with federal rules while maintaining state-specific adjustments.