The purpose of this legislation is to update the tax rules regarding wagering losses, which are losses incurred from gambling activities. The main objective is to clarify how these losses can be deducted from taxable income, ensuring that individuals can only deduct their gambling losses up to the amount of their gambling winnings. The key provision of this law reinstates a specific rule in the Internal Revenue Code that allows individuals to deduct their gambling losses, but only to the extent of their gambling gains.