The Federal Medical Assistance Percentage (FMAP) is computed from a formula that takes into account the average per capita income for each State relative to the national average. By law, the FMAP cannot be less than 50%. For more information, please see the KFF policy brief Medicaid Financing: The Basics.
In state fiscal year 2024, federal and state expenditures on Medicaid were nearly $39 billion, with 69% coming from the federal government.