Updating personal income tax definitions and provision of law relating to gaming and gambling losses

This bill updates West Virginia's personal income tax definitions to align with recent federal tax changes. It specifically preserves the ability for taxpayers to deduct gaming and gambling losses on their state returns for tax years beginning on or after January 1, 2026, ensuring this deduction remains available even if federal rules change. The bill adjusts how "federal adjusted gross income" is defined for state tax purposes and sets retroactive effective dates for 2025 tax years. It directly affects West Virginia taxpayers who itemize deductions and claim gambling losses.