Explaining Health Care Reform: Questions About Health Insurance Subsidies

Health insurance is expensive and can be hard to afford for people with lower or moderate income, particularly if they are not offered health benefits at work. In response, the Affordable Care Act (ACA) provides for sliding-scale subsidies to lower premiums and out-of-pocket (OOP) costs for eligible individuals.

This brief provides an overview of the financial assistance provided under the ACA for people purchasing coverage on their own through health insurance Marketplaces (also called exchanges).

Health Insurance Marketplace Subsidies

There are two types of financial assistance available to marketplace enrollees. The first type, called the premium tax credit, works to reduce enrollees’ monthly payments for insurance coverage. The second type of financial assistance, the cost sharing reduction, is designed to minimize enrollees’ out-of-pocket costs when they go to the doctor or have a hospital stay. To receive either type of financial assistance, qualifying individuals and families must enroll in a plan offered through a health insurance Marketplace.


The premium tax credit reduces enrollees’ monthly payments for insurance plans purchased through the Marketplace. Marketplace plans are offered in four “metal” levels of coverage: bronze, silver, gold, and platinum. Bronze plans tend to have the lowest premiums but have the highest deductibles and other cost sharing, leaving the enrollee to pay more out-of-pocket when they receive covered health care services, while platinum plans have the highest premiums but very low out-of-pocket costs. The premium tax credit can be applied to plans in any of these metal levels.

Also offered on the Marketplace are Catastrophic health plans with even lower premiums and higher cost sharing compared to bronze plans. Catastrophic plans are generally only available to individuals younger than 30, and premium tax credits cannot be applied to these plans.

Who is eligible for the premium tax credit?

To receive the premium tax credit for coverage starting in 2023, a marketplace enrollee must meet the following criteria:

  • Have a household income at least equal to the Federal Poverty Level (FPL), which for the 2023 benefit year will be determined based on 2022 poverty guidelines: (Table 1)
  • Not have access to affordable coverage through an employer (including a family member’s employer)
  • Not be eligible for coverage through Medicare, Medicaid, the Children’s Health Insurance Program (CHIP), or other forms of public assistance
  • Have U.S. citizenship or proof of legal residency (Lawfully present immigrants whose household income is below 100% FPL can also be eligible for tax subsidies through the Marketplace if they meet all other eligibility requirements.)
  • If married, must file taxes jointly in order to qualify

For the purposes of the premium tax credit, household income is defined as the Modified Adjusted Gross Income (MAGI) of the taxpayer, spouse, and dependents. The MAGI calculation includes income sources such as wages, salary, foreign income, interest, dividends, and Social Security.

Employer coverage is considered affordable if the required premium contribution is less than 9.12 percent of household income. The employer’s coverage must also meet the minimum value standard with an actuarial value of at least 60 percent (meaning the plan pays for an average of at least 60% of all enrollees’ combined health spending, similar to a bronze plan). The plan must also have an annual OOP limit on cost sharing of no more than $9,100/$18,200 in 2023. Minimum value plans must also provide substantial coverage for hospitalization and physician care. People who are offered employer-sponsored coverage that fails to meet one or both of these requirements can qualify for Marketplace subsidies if they meet the other criteria listed above. Previously, about 5 million dependents fell into what was called the “family glitch,” but starting in 2023, rules have changed to allow family members with unaffordable offers to purchase subsidized exchange coverage. In 2023, if employees and their family members would have to pay more than 9.12 percent of household income for family coverage, the dependents can purchase subsidized exchange coverage while the employee stays on employer coverage.

In states that have expanded Medicaid under the ACA, adults with income up to 138% FPL are generally eligible for Medicaid and so ineligible for Marketplace subsidies. In the states that have not adopted the Medicaid expansion, adults with income as low as 100% FPL can qualify for Marketplace subsidies, but those with lower incomes are not eligible for tax credits and generally not eligible for Medicaid unless they meet other state eligibility criteria. KFF estimates that 2.2 million Americans living in non-expansion states fall into this coverage gap.

An exception to the rule restricting tax credit eligibility for adults with income below the poverty level is made for certain lawfully present immigrants. Other federal rules restrict Medicaid eligibility for lawfully present immigrants, other than pregnant women, until they have resided in the U.S. for at least five years. Immigrants who would otherwise be eligible for Medicaid but have not yet completed their five-year waiting period may instead qualify for tax credits through the Marketplace. If an individual in this circumstance has an income below 100 percent of poverty, for the purposes of tax credit eligibility, his or her income will be treated as though it is equal to the poverty level. Immigrants who are not lawfully present are ineligible to enroll in health insurance through the marketplace, receive tax credits through the marketplaces, or enroll in non-emergency Medicaid and CHIP.

What amount of premium tax credit is available?

The premium tax credit works by limiting the amount an individual must contribute toward the premium for the “benchmark” plan – or the second-lowest cost silver plan available to the individual in their Marketplace. This “required individual contribution” is set on a sliding income scale. In 2023, for individuals with income up to 150% FPL, the required contribution is zero, while at an income of 400% FPL or above, the required contribution is 8.5% of household income (Table 2).

These amounts were set by the Inflation Reduction Act, which temporarily extends American Rescue Plan Act (ARPA) subsidies through the end of 2025. Prior to the ARPA, the required contribution percentages ranged from about 2% of household income for people with income just above poverty to nearly ten percent of income for people with income just under 400% FPL. In addition, prior to the ARPA, people with income above 400% FPL were not eligible for premium tax credits.

The amount of tax credit is calculated by subtracting the individual’s required contribution from the actual cost of the “benchmark” plan. So, for example, if the benchmark plan costs $6,000 annually, the required contribution for someone with an income of 150% FPL is zero, resulting in a premium tax credit of $6,000. If that same person’s income equals 250% FPL, the individual contribution is 4% of $33,975, or $1,359, resulting in a premium tax credit of $4,641.

The premium tax credit can then be applied toward any other plan sold through the Marketplace (except catastrophic coverage). The amount of the tax credit remains the same, so a person who chooses to purchase a plan that is more expensive than the benchmark plan will have to pay the difference in cost. Conversely, if a person chooses a less expensive plan, such as the lowest-cost silver plan or a bronze plan, the tax credit will cover a greater share of that plan’s premium, and possibly even cover the entire cost, leaving the consumer with a zero-premium plan. When the tax credit exceeds the cost of a plan, it lowers the premium to zero and any remaining tax credit amount is unused.

For certain components of a marketplace plan premium, the premium tax credit will not apply. First, the tax credit cannot be applied to the portion of a person’s premium attributable to covered benefits that are not essential health benefits (EHB). For example, a plan may offer adult dental benefits, which are not included in the definition of EHB. In that case, the person would have to pay the portion of the premium attributable to adult dental benefits without financial assistance. In addition, the ACA requires that premium tax credits may not be applied to the portion of premium attributable to “non-Hyde” abortion benefits. Marketplace plans that cover abortion are required to charge a separate $1 monthly premium to cover the cost of this benefit; this means a consumer who is otherwise eligible for a fully subsidized, zero-premium policy would still need to pay $1 month for a policy that covers abortion benefits. Finally, if the person smokes cigarettes and is charged a higher premium for smoking, the premium tax credit is not applied to the portion of the premium that is the tobacco surcharge.

How do people receive the premium tax credit?

To receive the premium tax credit, people must apply for coverage through the Marketplace and in their application, provide information about their age, address, household size, citizenship status, and estimated income for the coming year. After submitting the application, people will receive a determination letting them know the amount of premium tax credit for which they qualify. The consumer then has the option to have the tax credit paid in advance, claim it later when they file their tax return, or some combination of the two options.

The advanced premium tax credit (APTC) option allows consumers to have 1/12 of their tax credit paid directly to their marketplace plan insurer each month, reducing the monthly amount the consumer owes. However, because the APTC eligibility determination is based on estimated income, the enrollee is required to reconcile their APTC at tax time the following year, once they know what their actual income was. For people receiving an advanced payment of the premium tax credit in 2023, the reconciliation would occur when they file their 2023 tax return in 2024. If the consumer overestimated their income when they applied, they can receive the unclaimed premium tax credit as a refundable tax credit when they file. If the consumer underestimated their income at the time of application and excess APTC was paid on their behalf during the year, they would have to repay some or all of the excess tax credit when they file. There are maximum repayment limits which vary depending on income, shown in Table 3.

Alternatively, people can opt to pay their entire premium costs each month and wait to receive their tax credit until they file their annual income tax return the following year, although most marketplace participants cannot afford this option. The premium tax credit is refundable, meaning it is available to qualifying enrollees regardless of whether they have federal income tax liability. Everyone who receives an APTC in a tax year is required to file a tax return for that year in order to continue receiving financial assistance in the future.

Cost Sharing Reductions

The second form of financial assistance available to Marketplace enrollees is a cost sharing reduction. Cost sharing reductions lower enrollees’ out-of-pocket cost due to deductibles, copayments, and coinsurance when they use covered health care services.

Who is eligible for the cost sharing reduction?

People who are eligible to receive a premium tax credit and have household incomes from 100% to 250% of poverty are eligible for cost sharing reductions.

How are cost sharing reductions provided?

Unlike the premium tax credit (which can be applied toward any metal level of coverage), cost sharing reductions are only offered through silver plans. For eligible individuals, cost sharing reductions (CSR) are applied to a silver plan, essentially making deductibles and other cost sharing under that plan more similar to that under a gold or platinum plan. Individuals with income between 100% and 250% FPL can continue to apply their premium tax credit to any metal level plan, but they can only receive the cost sharing subsidies if they pick a silver-level plan.

What amount of cost sharing reductions are available to people?

Cost sharing reductions are determined on a sliding scale based on income. The most generous cost sharing reductions are available for people with income up to 150% FPL. For these enrollees, silver plans that would otherwise have an actuarial value of 70% (meaning the plan would have very high deductibles) are modified to have an actuarial value of 94%. This level of cost sharing reduction plan (sometimes called CSR 94 plans) is similar to a platinum plan, and it substantially reduces the deductibles, copays, and other cost sharing that normally apply in silver plans. Somewhat less generous cost sharing reductions are available for people with income of 151% FPL up to 200% FPL that increase the silver plan actuarial value to 87% (CSR 87 plans) and reduce cost sharing to amounts similar to those found in a gold plan. And for people with income above 200% up to 250% FPL, cost sharing reductions are available to increase the silver plan actuarial value to 73% (CSR 73 plans) and to modestly reduce deductibles and copays from those found under a normal silver plan.

Insurers have flexibility in how they set deductibles and copays to achieve the actuarial value under marketplace plans, including CSR plans. On average, in 2022 federal marketplace plans, annual deductibles in CSR94 plans were $146, compared to $4,753 in a normal Silver plan, while average annual deductible in CSR87 and CSR73 plans were $756 and $3,215, respectively.

The ACA also requires maximum annual out-of-pocket spending limits on cost sharing under marketplace plans, with reduced limits for CSR plans. In 2023, the maximum OOP limit will be $9,100 ($18,200 family) for all QHPs; with lower maximum OOP amounts permitted under cost sharing reduction plans (Table 4).