Assuring Medicare’s Promise Act of 2023

The Assuring Medicare’s Promise Act of 2023 directs that taxes collected under the net investment income tax (a tax on investment income for high earners) be added to the Medicare Hospital Insurance Trust Fund, which helps finance Medicare Part A benefits. It modifies the tax code to include certain business income of high-income individuals (with modified adjusted gross income over $400,000 for single filers or $500,000 for joint filers) in the tax base, but includes a phase-in mechanism to limit immediate tax increases. This bill primarily affects high-income taxpayers and aims to strengthen Medicare’s financial stability by increasing trust fund revenue.