Medicaid is funded by both the federal government and individual states, with the federal share covering between 50 and 77 percent depending on how poor the state is

The federal government pays a base share of every state's Medicaid costs through the Centers for Medicare & Medicaid Services (CMS). States then pay the remainder from their own budgets — usually through general tax revenue, sales tax, or income tax. The federal percentage is called the Federal Medical Assistance Percentage (FMAP), and it shifts each year based on a formula tied to state unemployment and income levels. Poorer states get a higher federal match; wealthier states get a lower one.

This split funding means Medicaid is not a single national program with one budget. It is fifty separate programs, each with its own funding stream and rules. When a state runs short of money, it cannot simply ask the federal government for more — it has to cut services, reduce provider payments, or raise its own revenue. When the federal government changes its funding level, states feel the impact immediately in their budgets.

Key Takeaways

  • The federal government covers 50 to 77 percent of Medicaid costs depending on state poverty levels, with states covering the rest from their own tax revenue.
  • The federal share is recalculated each year using a formula based on state unemployment and per capita income, so the percentage changes annually.
  • States must balance their own budgets and cannot run deficits, so when federal funding drops or costs rise, states cut provider payments or reduce covered services.
  • Federal emergency funding has temporarily raised the federal share during recessions and public health emergencies, but these increases are temporary and states must plan for them to end.

How the Federal Share Is Calculated Each Year

The FMAP formula uses two main measures: the state's per capita income compared to the national average, and the state's unemployment rate. A state with lower per capita income and higher unemployment gets a higher federal match. The formula is set by law and recalculates automatically each year, usually in October for the fiscal year that begins the following January.

The minimum federal share is always 50 percent, even for the wealthiest states. The maximum is 77 percent, which applies to the poorest states. Most states fall somewhere in between. For example, Mississippi typically receives around 75 percent federal funding because of its lower per capita income, while Massachusetts typically receives around 50 percent. These percentages mean that when Medicaid costs rise, the burden on state budgets is much heavier in wealthy states than in poor ones.

States learn their FMAP for the upcoming year in advance, which allows them to plan their budgets. However, the formula can produce unexpected shifts if a state's economy changes rapidly — a recession can raise a state's FMAP, while economic growth can lower it. This creates budget uncertainty for states that rely on Medicaid to cover large portions of their populations.

Where States Get Their Share of the Money

States fund their portion of Medicaid through general revenue — the same pool of money they use to pay for schools, roads, and state employee salaries. Most states use some combination of income tax, sales tax, and corporate tax. A few states have no income tax and rely more heavily on sales and excise taxes. Some states also use tobacco taxes or alcohol taxes to fund Medicaid specifically.

When state revenues drop — during a recession, for example — Medicaid budgets are often the first to face cuts because they are large and flexible compared to other spending. Unlike federal budgets, states cannot run deficits, so they must either raise taxes, cut services, or both. This is why Medicaid coverage and provider payments often shrink during economic downturns, even though more people need coverage during those same periods.

A few states have also created dedicated funding streams for Medicaid by taxing hospitals or health plans directly. These taxes generate revenue that goes into the state Medicaid budget. The federal government then matches these state funds at the FMAP rate, effectively multiplying the state's revenue. This strategy allows states to increase their Medicaid budgets without raising general taxes, though it shifts costs onto healthcare providers.

How Emergency Federal Funding Changes the Split

During recessions and public health emergencies, Congress has temporarily raised the federal FMAP to help states avoid cutting Medicaid during periods of high need. During the 2008 financial crisis, the federal government raised its share by 6.2 percentage points for two years. During the COVID-19 pandemic, the federal share was raised by 6.2 percentage points starting in March 2020, and this increase was extended multiple times before ending in March 2023.

These temporary increases are meant to prevent states from cutting Medicaid enrollment or benefits when unemployment is high and more people need coverage. However, they are always temporary, and states must plan for them to end. When the increase expires, states face a "cliff" where their federal funding drops back to the regular FMAP, and they must find the money to cover the gap or reduce services. The end of the pandemic federal increase in 2023 forced many states to cut enrollment or reduce covered services.

Congress can also pass targeted funding for specific Medicaid programs or populations — for example, additional money for maternal health or substance use treatment. These funds come with specific rules about how they must be spent and often require states to maintain certain service levels to receive them.

What Medicaid Funding Actually Pays For

Medicaid money goes to three main categories: payments to doctors, hospitals, and other healthcare providers; payments to managed care insurance companies that contract with states to deliver Medicaid; and administrative costs for running the program. The split between these categories varies by state. Some states use managed care for most enrollees, while others use fee-for-service models where the state pays providers directly for each service.

Provider payments are typically much lower than what Medicare or private insurance pays for the same service. A state might pay a doctor $40 for an office visit that Medicare pays $100 for. This is why some doctors limit the number of Medicaid patients they see — the payment does not cover their costs. When states cut their Medicaid budgets, they often cut provider payment rates further, which can reduce access to care.

Administrative costs include salaries for state Medicaid staff, computer systems, may be able to access verification, and fraud detection. These costs are also matched by the federal government at the FMAP rate, so the federal government pays a share of the cost to run the program itself, not just the cost of medical services.

How Medicaid Funding Differs From Medicare

Medicare is funded entirely by the federal government through payroll taxes and general revenue. It has one national budget and one set of rules. Medicaid is funded jointly and has fifty different budgets and fifty different rule sets. This means Medicaid is more vulnerable to state budget crises and more likely to change when state legislatures change, while Medicare is more stable.

Medicare also has dedicated funding through the Medicare Trust Fund, which is built from payroll taxes. Medicaid has no dedicated funding source — it competes with other state priorities every budget cycle. This structural difference means Medicare coverage is more predictable, while Medicaid coverage can shift year to year depending on state finances and political priorities.

Frequently Asked Questions

Why does the federal government pay a different percentage in each state?

The federal formula is designed to help poorer states afford Medicaid by giving them a higher federal match. A state with lower average income and higher unemployment gets more federal money per dollar of state spending. This is meant to ensure that Medicaid is available in all states regardless of state wealth, though in practice some poor states still struggle to fund their programs.

What happens to Medicaid when a state has a budget crisis?

States must balance their budgets, so when revenues drop or costs rise, they must cut spending somewhere. Medicaid is often cut because it is large and flexible. States may reduce provider payment rates, cut covered services, freeze enrollment, or impose work requirements. The federal government cannot force states to maintain Medicaid at any particular level — it can only set minimum standards for programs that want federal matching funds.

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

Only in specific circumstances. During the COVID-19 pandemic, the federal government temporarily paid a higher share, but never 100 percent. For certain populations or services that states choose to add beyond the federal minimum, the federal match may be lower or nonexistent. But for the core Medicaid program, states always pay at least 23 percent of costs.

Can a state opt out of Medicaid entirely?

Technically yes, but no state has done so because the federal matching funds are too valuable. A state that left Medicaid would lose billions in federal revenue and would have to replace that money entirely from its own budget. Instead, states sometimes reduce their Medicaid programs or change may be able to access rules within the federal framework.

How does Medicaid funding affect the services I can get?

When a state's Medicaid budget is tight, it may limit which services are covered, how much providers are paid, or how many people can enroll. This can mean longer waits for appointments, fewer providers accepting Medicaid, or gaps in coverage for certain treatments. Funding levels also affect whether a state can expand Medicaid to cover more people, which is why expansion varies widely by state.