The main purpose of this legislation is to change how wagering losses are treated under U.S. tax law. Specifically, it aims to allow individuals to deduct 100 percent of their wagering losses from their taxable income, rather than the current limit of 90 percent. This change is intended to provide fairer tax treatment for those who engage in betting activities. The key provision of this legislation is the amendment to the Internal Revenue Code, which modifies the existing rule that allows taxpayers to deduct only 90 percent of their wagering losses.