The main purpose of this legislative proposal is to change how Social Security benefits are taxed. Specifically, it aims to eliminate the requirement that these benefits be included in a person's gross income for tax purposes. This means that individuals receiving Social Security would no longer have to pay federal income tax on their benefits, which could provide significant financial relief for many seniors. The key provision of this proposal is the repeal of the current tax treatment of Social Security benefits as outlined in the Internal Revenue Code.