Assuring Medicare’s Promise Act of 2025

HR 609, the Assuring Medicare's Promise Act of 2025, directs revenue from the net investment income tax (currently applied to investment income) into the Medicare Hospital Insurance Trust Fund. It expands the tax base to include certain business income for high-income individuals with modified adjusted gross income exceeding $400,000 ($500,000 for joint filers), with a phase-in to limit the tax increase. The bill ensures this tax revenue directly supports Medicare's hospital insurance program, applying to taxable years beginning after December 31, 2025. The changes do not alter the tax rate but broaden the income types subject to the tax for high earners.