The ACA tax credit lowers your monthly insurance bill by reducing what you owe upfront

The Affordable Care Act (ACA) tax credit, officially called the Premium Tax Credit, is money the federal government sends directly to your health insurance company each month to pay part of your premium. You do not wait until tax time to receive it. Instead, the credit reduces what you owe when you sign up for a plan through Healthcare.gov or your state's marketplace, so your monthly bill is smaller from day one.

The credit is based on your household income and the cost of the second-cheapest Silver plan available where you live. If you earn between 100% and 400% of the federal poverty line, you likely may have access to for some credit. The government estimates what you will earn this year, calculates the credit, and sends it to your insurer monthly. At tax time the following year, you reconcile what you actually earned with what you estimated—if you earned less than expected, you may owe money back; if you earned more, you keep the benefit you received.

Key Takeaways

  • The tax credit is sent to your insurance company monthly, not given to you at tax time, so it reduces your bill when ready when you enroll.
  • You must report your expected household income when you sign up, and the credit amount changes if your actual income differs significantly from what you estimated.
  • The credit is only available through Healthcare.gov or your state marketplace—you cannot use it if you buy insurance directly from a company or through an employer.
  • If you receive too much credit during the year, you repay the difference when you file taxes; if you receive too little, you may get a refund.
  • Your income, family size, and the cost of plans in your area all affect how much credit you receive each month.

How the government calculates your credit amount

The credit is built on a formula that compares two numbers: what the government thinks you should pay for insurance, and what the second-cheapest Silver plan costs in your area. The government's target for what you should pay is a percentage of your household income—that percentage rises as your income rises. For someone earning 150% of the poverty line, the target is roughly 0% to 2% of income; for someone earning 300% of the poverty line, it is roughly 8% to 9%.

The credit fills the gap between your target amount and the actual cost of that Silver plan. If the Silver plan costs $400 per month and your target is $50, the credit covers $350. If you choose a cheaper Bronze plan instead, the credit still covers $350—you pay the difference out of pocket. If you choose a more expensive Gold or Platinum plan, you pay the extra cost yourself.

Your income estimate is the single biggest factor. The government uses your modified adjusted gross income (MAGI), which is roughly your total household income including wages, self-employment income, and certain other sources. You report this when you enroll, and the marketplace uses it to calculate your credit for the entire year ahead.

What happens if your income changes during the year

If your income rises or falls significantly after you enroll, you should report the change to the marketplace. A major change—a job loss, a new job, marriage, divorce, or a child born—can affect your credit. If you do not report it and your actual income ends up much higher than you estimated, you will owe back some or all of the credit when you file taxes.

The repayment is capped for people with lower incomes. In 2024, if your income is below 200% of the poverty line, you owe back no more than $300 if you are single or $600 if you are married filing jointly. Above 200%, the cap is higher. This cap protects lower-income households from a large surprise bill at tax time, but it does not eliminate the repayment entirely.

If your income drops, reporting it can increase your credit, which lowers your monthly bill for the rest of the year. You can update your income information through Healthcare.gov or your state marketplace at any time.

The difference between the credit and cost-sharing reductions

The tax credit and cost-sharing reductions (CSRs) are separate benefits that work together. The tax credit reduces your monthly premium. Cost-sharing reductions lower your deductible, copayments, and coinsurance—the money you pay when you actually use care. Both are available only to people earning between 100% and 250% of the poverty line, and both require you to enroll through the marketplace.

To receive cost-sharing reductions, you must choose a Silver plan. The plan itself looks the same on the marketplace, but if you may have access to for CSRs, your out-of-pocket costs are much lower than the standard Silver plan. You do not explore separately for CSRs; the marketplace automatically enrolls you if you meet the income threshold and choose Silver.

Where to enroll and how to report your income

You enroll through Healthcare.gov if you live in a state that uses the federal marketplace, or through your state's own marketplace if your state runs one. During the annual open enrollment period—usually November 1 through January 15—you create an account, report your household size and expected income, and compare plans. Outside open enrollment, you can enroll only if you have a may have access to life event: loss of job-based coverage, marriage, divorce, birth of a child, or move to a new state.

When you report income, be as accurate as possible. Use your most recent tax return, recent pay stubs, or an estimate if your income is irregular or you are self-employed. The marketplace will ask for your Social Security number and may verify your income against IRS records. If there is a mismatch, the marketplace will contact you to resolve it before you enroll.

Reconciling the credit at tax time

When you file your federal income tax return the following year, you report how much credit you received during the year and what your actual income was. The IRS compares the two and calculates whether you owe money back or are owed a refund. You report this on Form 8962, Premium Tax Credit (PTC), which is filed with your 1040.

If you received $4,800 in credits during the year but your actual income means you should have received only $3,600, you owe back $1,200. If you received $3,600 but should have received $4,800, you get a $1,200 refund. The repayment cap protects lower-income filers, but higher-income filers can owe back the full amount if they underestimated their income.

This is why accuracy matters: overestimating your income means you pay more each month than you need to, but you will not owe money back. Underestimating means a lower bill now but a potential bill at tax time. If your income is stable and predictable, estimate conservatively.

When you cannot use the ACA tax credit

The credit is available only if you buy insurance through the marketplace. If you have job-based insurance through an employer, you do not may have access to—your employer's plan is considered affordable if it covers at least 60% of costs and the employee premium is no more than a certain percentage of household income. If you buy insurance directly from a company outside the marketplace, you cannot use the credit.

You also do not may have access to if you are incarcerated, are not a U.S. citizen or national, or do not have a valid Social Security number. If you are claimed as a dependent on someone else's tax return, you cannot receive the credit yourself—only the person claiming you can.

Frequently Asked Questions

Can I get the tax credit if I have insurance through my job?

No. The credit is only for people who buy through the marketplace. If your employer offers coverage, you are not may be able to access, even if the employer plan is expensive. However, if your employer's plan is unaffordable—the employee premium exceeds a certain percentage of your income—you may be able to buy through the marketplace and receive the credit instead.

What happens if I do not report a big income change?

If your actual income is much higher than you estimated, you will owe back some or all of the credit when you file taxes. The repayment is capped at $300 to $600 for lower-income filers, but higher-income filers can owe back the full amount. Reporting changes as they happen prevents surprises.

Do I have to choose a Silver plan to get the tax credit?

No. The credit is calculated based on the Silver plan, but you can use it toward any plan—Bronze, Silver, Gold, or Platinum. If you choose a cheaper plan, you pay less out of pocket; if you choose a more expensive plan, you pay the difference yourself.

Can I get the credit if I am self-employed?

Yes. Self-employed people report their net business income on their tax return, and that income is used to calculate the credit. You estimate your income when you enroll and reconcile it when you file taxes, just like anyone else.

What if the marketplace says I do not may have access to because of my income?

If your income is below 100% of the poverty line, you do not may have access to for the credit in most states. Some states have expanded Medicaid to cover this group; if yours has not, you may have no low-cost option. Contact your state health department or 211 to learn what programs may be available where you live.