Paying a Fair Share Act of 2025

Legislative Summary: Paying a Fair Share Act of 2025 (S. 1243)

Overview

The Paying a Fair Share Act of 2025 is a legislative proposal designed to establish a tax "floor" for the wealthiest taxpayers in the United States. The primary intent of the bill is to ensure that high-income individuals pay a minimum level of tax relative to their income, regardless of the deductions or loopholes they may use to lower their tax liability. The Senate describes this act as an interim step toward broader tax reform aimed at reducing the national deficit and increasing tax equity.

Key Provisions

1. The "Fair Share Tax"

The bill introduces a new tax imposed on "high-income taxpayers" in addition to their existing tax obligations.

• The Calculation: The tax is based on a "tentative fair share tax," which is calculated as 30% of the taxpayer's adjusted gross income (AGI) minus a modified charitable contribution deduction.
• The Offset: The actual tax owed is not a flat 30% on top of everything else. Instead, it is the amount by which the "tentative fair share tax" exceeds the sum of:
  • The taxpayer's regular tax liability.
  • The Alternative Minimum Tax (AMT) imposed under section 55.
  • Applicable payroll taxes.
• The Phase-in: The tax is phased in based on how much the taxpayer's AGI exceeds the high-income threshold.

2. Who is Affected?

The bill specifically targets "high-income taxpayers," defined as:
* Individuals: Any taxpayer (other than a corporation) with an adjusted gross income exceeding $1,000,000.
* Married Individuals Filing Separately: Those with an AGI exceeding $500,000.

3. Inflation Adjustments

To ensure the threshold remains relevant, the $1,000,000 limit will be adjusted for inflation for taxable years beginning after 2025, based on cost-of-living adjustments. These adjustments will be rounded down to the nearest $10,000 increment.

Impact and Implementation

Affected Parties

• Ultra-High-Net-Worth Individuals: Those who currently use significant deductions or credits to reduce their effective tax rate below 30% of their AGI will see an increase in their total tax liability.
• Estates and Trusts: These entities are also subject to the tax, with AGI computed according to specific trust/estate rules.
• Charitable Organizations: While the bill allows for a "modified charitable contribution deduction," it only applies to taxpayers who choose to itemize their deductions.

Timeline and Procedure

• Effective Date: The amendments are set to apply to taxable years beginning after December 31, 2024.
• Procedural Status: As of April 1, 2025, the bill has been introduced in the Senate and referred to the Committee on Finance.

Summary Table