The main purpose of this legislation is to reduce federal spending and the national deficit by ending the practice of using taxpayer money to finance presidential election campaigns. This is part of a broader effort to cut unnecessary government expenses. The key provisions of the legislation include the termination of taxpayer financing for presidential elections. Specifically, it amends existing tax laws to stop allowing individuals to designate a portion of their income tax payments to a presidential election campaign fund starting from the 2025 tax year.