Medicaid is funded by both the federal government and individual states, with the federal government covering a percentage that varies by state.

The federal government does not pay for all of Medicaid. Instead, the two levels of government split the cost. The federal share ranges from 50% to 75% of total spending, depending on the state's average income level. States with lower average incomes receive a higher federal match; wealthier states receive a lower one. This means a state like Mississippi might receive 75% federal funding for a given service, while a state like New Hampshire might receive 50%.

Each state decides which services to cover within federal guidelines, and each state pays its own share of those costs. The federal government sets minimum requirements — Medicaid must cover certain groups like children, pregnant people, and people over 65 — but states can expand coverage beyond those minimums. When a state expands, it pays a larger share of the expansion costs, though the federal government still contributes.

Key Takeaways

  • The federal government pays between 50% and 75% of Medicaid costs in each state, with the percentage based on that state's average income level.
  • States pay the remaining share and decide which services beyond federal minimums to cover, meaning Medicaid differs from state to state.
  • Federal funding comes from general tax revenue, not a separate Medicaid tax.
  • When states expand Medicaid to cover more people, the federal government contributes a set percentage of the expansion costs, but the state still bears part of the expense.

How the federal-state split actually works

The federal government calculates each state's Federal Medical Assistance Percentage (FMAP) using a formula based on per capita income. A state with lower per capita income gets a higher FMAP. The formula is set by law and recalculated each year, so the percentages can shift slightly from year to year.

Once the FMAP is set, it applies to most Medicaid services. If a state's FMAP is 60%, the federal government pays 60% of the cost of covered services, and the state pays 40%. Some services have different federal match rates — for example, administrative costs or certain optional services may have their own percentages.

States must maintain a minimum level of spending on Medicaid to receive federal funds. This is called the maintenance of effort requirement. If a state tries to cut its Medicaid budget too deeply, it loses federal matching dollars, which usually makes the cut more expensive, not less.

Where the federal money comes from

Federal Medicaid funding comes from general U.S. tax revenue — income taxes, payroll taxes, and other sources — not from a dedicated Medicaid tax. Congress appropriates money for Medicaid each year as part of the federal budget. Unlike Medicare, which has a dedicated payroll tax, Medicaid is funded through the general Treasury.

During economic downturns, Congress sometimes increases the federal match temporarily to help states manage higher enrollment and costs. This happened during the 2008 financial crisis and again during the COVID-19 pandemic, when the federal government temporarily raised the FMAP for all states.

Why states pay part of the cost

States fund their share of Medicaid through state income taxes, sales taxes, and other state revenue sources. Some states also use tobacco taxes or other dedicated revenue streams. Because states must contribute, they have a financial incentive to manage costs, but they also have flexibility to decide what services to offer and to whom.

This shared funding model means that Medicaid coverage and benefits can vary significantly between states. One state might cover dental care for adults; another might not. One state might cover a broader income range; another might be more restrictive. The federal minimum sets a floor, but states build on top of it with their own resources and priorities.

Medicaid expansion and federal funding

When the Affordable Care Act was passed in 2010, it included an option for states to expand Medicaid to cover more low-income adults. The federal government initially offered to pay 100% of expansion costs for the first three years, then gradually reduced that to 90% by 2020 and beyond. This higher match rate was meant to encourage states to expand.

Not all states chose to expand. Those that did took on the commitment to pay their share of expansion costs indefinitely. A state that expands Medicaid must continue paying its share even if federal funding percentages change or if the state faces budget pressure later.

How federal funding affects what you can access

The federal funding structure means that the services available to you depend partly on your state's budget decisions and partly on federal requirements. Your state must cover certain mandatory services to receive any federal funding, but it can choose to cover additional optional services if it has the budget.

If your state faces a budget crisis, it cannot simply cut Medicaid without losing federal matching funds. However, it can request a waiver from the federal government to change benefits or may be able to access rules. These waivers are reviewed by the Centers for Medicare & Medicaid Services (CMS), the federal agency that oversees Medicaid.

Frequently Asked Questions

Does the federal government pay for all Medicaid in any state?

No. Even in states with the highest federal match rates, the state still pays at least 25% of Medicaid costs. The federal share never reaches 100% for ongoing services, though it did temporarily during the pandemic.

Can a state refuse federal Medicaid funding?

No. All states participate in Medicaid because the federal funding is too large to turn down, and the program is a condition of receiving federal highway funding and other federal grants. However, states do have some flexibility in how they structure their programs within federal rules.

What happens if a state runs out of money for Medicaid?

States cannot simply stop providing Medicaid. They must maintain their spending level to receive federal matching funds. If a state faces a budget crisis, it typically requests a waiver to change benefits or may be able to access, or it raises state revenue. The federal government does not bail out states' Medicaid costs.

Does my tax money go to Medicaid in other states?

Yes. Federal Medicaid funding comes from general tax revenue, so your federal taxes support Medicaid in all states, not just your own. Similarly, federal taxes paid by people in other states support Medicaid in your state.

Why do some states have better Medicaid coverage than others?

States have different income levels, different tax bases, and different political priorities. A wealthier state with higher tax revenue can choose to cover more services or broader populations. A state with lower average income receives a higher federal match but may still have less total money to spend on Medicaid.