What ACA Tax Credits Do

ACA tax credits (also called premium tax credits) lower the monthly cost of health insurance by reducing what you pay to the insurance company. The credit goes directly to your insurer each month, so your bill is smaller from the start—you do not pay full price and wait for a refund later. The amount you receive depends on your household income, family size, and the cost of the second-cheapest Silver plan in your area.

The credit is not a loan. You do not have to pay it back unless you underestimated your income when you signed up. If your actual income turns out to be lower than you reported, you keep the extra credit. If it turns out to be higher, you may owe some back when you file taxes the following year.

Key Takeaways

  • ACA tax credits reduce your monthly insurance bill by paying part of your premium directly to the insurance company.
  • The amount you receive is based on your household income, family size, and the cost of the second-cheapest Silver plan available where you live.
  • You report your expected income when you sign up for insurance, and the credit is calculated based on that estimate.
  • When you file taxes the following year, the IRS compares your actual income to what you reported and adjusts the credit if needed.
  • You can update your income or family size during the year if your situation changes, which may increase or decrease your credit.

How Income Determines Your Credit Amount

The IRS uses a formula based on your household income and the federal poverty line for your family size. Your credit is designed to cap your premium payment at a percentage of your income—that percentage increases with income. For example, a single person earning $30,000 per year might pay 2% of income toward premiums, while someone earning $50,000 might pay 4%.

The second piece of the formula is the cost of the second-cheapest Silver plan in your county. If that plan costs $400 per month and your income-based percentage means you should pay $100 per month, the credit covers the $300 difference. If you choose a cheaper Bronze plan instead, you pay less out of pocket but the credit amount stays the same—you pocket the savings. If you choose a more expensive Gold or Platinum plan, you pay the difference yourself.

Your income for this calculation is your modified adjusted gross income (MAGI), which is usually your adjusted gross income from your tax return plus any tax-exempt interest. Self-employment income, wages, and investment income all count. Social Security benefits do not count unless you file a joint return with a spouse.

Reporting Income and Updating Changes

When you sign up for insurance through Healthcare.gov or your state marketplace, you report your expected household income for that year. The marketplace uses this number to calculate your credit when ready. You do not need to wait for tax time—the credit starts reducing your bill the month your coverage begins.

If your income changes during the year—you get a raise, lose a job, get married, have a baby, or your spouse's income changes—you can report the change to the marketplace. The marketplace will recalculate your credit based on the new income. Reporting changes quickly prevents you from owing money back at tax time. If you wait until you file taxes to report a major income increase, you may owe back a large portion of the credits you received.

You can update your information anytime outside of open enrollment. The marketplace will ask for proof of the change—a pay stub for a raise, a termination letter for job loss, a birth certificate for a new baby. Once you report the change, your new credit amount takes effect the following month.

What Happens at Tax Time

When you file your federal income tax return the following year, you report how much in ACA tax credits you received during the year. The IRS compares this to the amount you were actually may have access to to based on your actual income. Form 8962 (the reconciliation form) calculates the difference.

If you received more credit than you were may have access to to—because your actual income was higher than you estimated—you owe the difference back. The IRS subtracts this amount from your refund or adds it to the taxes you owe. If you received less credit than you were may have access to to—because your actual income was lower—you get the difference as a refund or credit against your taxes.

The amount you owe back is capped based on your filing status and income. For example, in 2024, a single filer with income between 200% and 300% of the poverty line owes back no more than $650 if they underestimated their income. Higher-income filers have higher caps. This cap protects lower-income people from owing back large amounts if their income estimate was off.

Income Limits and Credit Phases Out

You can only receive an ACA tax credit if your income falls between 100% and 400% of the federal poverty line (some states have expanded this to 400% and above). For 2024, 100% of the poverty line for a single person is roughly $14,600 per year, and 400% is roughly $58,400. These numbers change each year and vary by family size.

If your income is below 100% of the poverty line, you do not may have access to for a credit through the marketplace—you may be directed toward Medicaid instead, depending on your state. If your income is above 400% of the poverty line, you do not may have access to for a credit and must pay the full premium yourself.

As your income rises within the 100% to 400% range, your credit decreases. The credit does not disappear all at once at 400%—it phases out gradually as income increases. This means someone at 350% of poverty gets a smaller credit than someone at 250%, but still gets something.

Common Mistakes and How to Avoid Them

The most common mistake is not updating your income when it changes. If you get a significant raise and do not report it, you will receive too much credit during the year and owe it back at tax time. The IRS may subtract the amount owed from your refund, leaving you with little or nothing. Report changes as soon as they happen—the marketplace can process updates within days.

Another mistake is confusing the ACA tax credit with the cost-sharing reduction (CSR). The CSR is a separate benefit that lowers your deductible and out-of-pocket costs, but you only receive it if you choose a Silver plan and your income is below 250% of the poverty line. You must be receiving the ACA tax credit to receive CSR, but the two are different programs.

A third mistake is not filing taxes because you think you do not owe anything. If you received ACA credits, you must file a return even if your income was low enough that you would not normally owe taxes. The IRS needs to reconcile your credits, and you may be owed money back.

Frequently Asked Questions

What if my income goes down during the year?

Report the decrease to the marketplace right away. Your credit will increase, lowering your monthly bill. At tax time, you will not owe anything back—you will either get a refund or a credit against your taxes if you received less credit than you were may have access to to.

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

Yes. Self-employment income counts toward your household income for credit purposes. You report your net self-employment income (after business expenses) on your tax return, and that number is used to calculate your credit. Report your expected income when you sign up, and update it if your business income changes significantly.

What if I do not update my income and owe money back?

The IRS will reconcile your credits when you file taxes. If you owe back more than the cap for your income level, you only owe up to the cap—the rest is forgiven. If you owe less than the cap, you owe the full amount. You can pay it with your tax return or have it subtracted from your refund.

Do I lose the credit if I switch jobs?

Not automatically. Your credit is based on your household income, not your employer. If your new job pays roughly the same, your credit stays the same. If your new job pays significantly more or less, report the change to the marketplace so your credit is recalculated. If you have a gap between jobs, report that too—your credit may increase during the gap.

Can I claim the credit if someone else claims me as a dependent?

No. If another person claims you as a dependent on their tax return, you cannot claim the ACA tax credit. This is common for adult children living with parents or for other family situations. The person claiming you as a dependent is responsible for your health insurance costs in the eyes of the tax code.