Medicaid is funded by both the federal government and individual states

Medicaid is not funded by a single source. The federal government and each state split the cost, with the federal share ranging from 50% to 77% depending on the state's average income. States with lower average incomes receive a higher federal match, meaning the federal government pays more of the bill. This arrangement has been in place since Medicaid began in 1965.

The federal government does not run Medicaid directly. Instead, it sets broad rules about who must be covered and what services must be offered, then gives money to states to run their own programs. Each state designs its own Medicaid program within those federal guidelines, which is why coverage and income limits differ from state to state.

Neither the federal government nor states fund Medicaid through a dedicated tax or fee. Instead, both use general revenue — federal income taxes and state income taxes, sales taxes, or other revenue sources. There is no separate "Medicaid tax" on paychecks.

Key Takeaways

  • The federal government pays between 50% and 77% of Medicaid costs in each state, with poorer states receiving a higher federal share.
  • States design and run their own Medicaid programs using federal money plus their own state funds, which is why rules vary by location.
  • Medicaid is funded through general tax revenue, not a dedicated payroll tax or enrollment fee.
  • The federal match percentage is set by a formula based on each state's per capita income and is adjusted yearly.
  • When a state spends more on Medicaid, the federal government automatically sends more money under the matching formula.

How the federal-state funding split works

The federal government calculates each state's Federal Medical Assistance Percentage (FMAP), which determines how much federal money that state receives for every dollar it spends on Medicaid. The FMAP is based on a formula using the state's average per capita income compared to the national average. A state with lower average income gets a higher FMAP — meaning the federal government covers a larger share of costs.

For example, if a state has an FMAP of 60%, the federal government pays 60 cents for every dollar the state spends on Medicaid, and the state pays 40 cents. If another state has an FMAP of 75%, the federal government pays 75 cents per dollar. The FMAP is recalculated each year and can change based on shifts in state income levels.

The federal floor is 50%, meaning no state receives less than a 50% federal match, even if its income is above the national average. The federal ceiling is 83%, though most states fall between 50% and 77%. During national emergencies or recessions, Congress has temporarily increased the federal match to help states manage sudden cost increases.

What the federal government pays for

The federal government does not pay for all Medicaid services equally. Mandatory services — those that every state must cover, such as hospital care, doctor visits, and emergency services — receive the full FMAP match. If a state spends $100 on mandatory services and its FMAP is 65%, the federal government sends $65 and the state pays $35.

Optional services — such as dental care, vision care, or physical therapy — also receive the federal match, but states choose whether to offer them. If a state adds an optional service, the federal government pays its share of that cost too. This creates an incentive for states to expand coverage, because the federal government picks up a large portion of the bill.

The federal government also funds administrative costs — the staff and systems states use to run Medicaid — though at a lower match rate than medical services. Administrative costs typically receive a 50% federal match regardless of the state's FMAP.

State funding sources for Medicaid

States pay their share of Medicaid through general revenue, which comes from income taxes, sales taxes, corporate taxes, and other state sources. Some states also use dedicated revenue streams, such as taxes on tobacco or alcohol, to fund Medicaid. A few states have created special taxes or fees specifically to generate Medicaid revenue, though this is uncommon.

Medicaid is typically the largest or second-largest budget item for most states, competing with education and transportation for funding. When state revenues drop during a recession, states often face difficult choices about whether to cut Medicaid spending, reduce provider payment rates, or reduce may be able to access. The federal government sometimes steps in during emergencies to increase the federal match temporarily, which reduces pressure on state budgets.

States cannot reduce their Medicaid spending below a certain floor without losing federal funding. This is called the maintenance of effort requirement. It prevents states from cutting Medicaid to balance their budgets, though Congress can waive this requirement during national emergencies.

How Medicaid expansion changed funding

In 2014, states gained the option to expand Medicaid to cover adults earning up to 138% of the federal poverty level. The federal government offered to pay 100% of the cost of expansion for the first three years, then gradually reduce the match to 90% by 2020 and beyond. This high federal match was designed to encourage states to expand coverage.

States that chose to expand Medicaid received additional federal dollars, while states that declined expansion did not. This created variation in coverage across the country — some states cover many more low-income adults than others, depending on whether they expanded. The federal government continues to pay 90% of expansion costs, with states paying 10%.

Expansion has been one of the largest changes to Medicaid funding since the program began. States that expanded saw their federal Medicaid dollars increase significantly, while non-expansion states did not receive that additional federal money. This is one reason why Medicaid coverage and may be able to access look different depending on where you live.

What happens when Medicaid costs rise

When a state's Medicaid costs increase — because more people enroll, medical prices rise, or new services are added — the federal government automatically sends more money under the matching formula. If a state spends an additional $10 million on Medicaid and its FMAP is 65%, the federal government sends an additional $6.5 million. This automatic adjustment is built into how Medicaid funding works.

However, if a state wants to reduce Medicaid spending, it cannot simply cut the program. It must follow federal rules about who must be covered and what services must be offered. States can reduce provider payment rates (what they pay doctors and hospitals) or tighten may be able to access rules, but only within federal limits. Any major change to Medicaid coverage requires federal approval.

During the COVID-19 pandemic, Congress increased the federal match temporarily to help states manage enrollment surges and rising costs. This temporary increase ended in 2023, and states returned to their regular FMAP rates. Some states struggled with the transition because they had grown accustomed to the higher federal funding.

Frequently Asked Questions

Does the federal government ever pay 100% of Medicaid costs?

No, except in rare circumstances. The federal floor is 50%, so states always pay at least 50% of Medicaid costs. During the Medicaid expansion period (2014–2016), the federal government paid 100% of expansion costs, but that was temporary. The federal match for expansion is now 90%, and states pay 10%.

Can a state refuse federal Medicaid money?

No. If a state operates a Medicaid program, it must follow federal rules and accept federal funding. A state cannot opt out of Medicaid entirely. However, a state can choose not to expand Medicaid to cover additional adults, which means it does not receive the federal dollars tied to expansion.

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

States cannot simply stop paying for Medicaid. They must continue covering mandatory services and populations. If a state faces a budget crisis, it can request a federal waiver to reduce optional services, tighten may be able to access, or reduce provider payment rates. The federal government may or may not approve the waiver depending on the circumstances.

Does Medicaid funding come from my taxes?

Yes, Medicaid is funded through general tax revenue. Federal Medicaid spending comes from federal income taxes and other federal revenue sources. State Medicaid spending comes from state income taxes, sales taxes, and other state revenue sources. There is no separate Medicaid tax on paychecks.

Why do some states have higher Medicaid costs than others?

States differ in enrollment size, provider payment rates, and the breadth of services covered. A state with a larger low-income population or higher medical costs will spend more on Medicaid. States that cover optional services or have higher provider payment rates also spend more. The federal match helps offset these differences, but does not eliminate them.