The main purpose of the Paying a Fair Share Act of 2025 is to ensure that high-income earners contribute a fairer share of federal taxes. The legislation aims to address perceived inequities in the tax system, particularly focusing on individuals with significant incomes. Key provisions of the act introduce a new tax specifically for high-income taxpayers. This tax is calculated based on the taxpayer's adjusted gross income exceeding million, or $500,000 for married individuals filing separately.