How ACA Subsidies Work: The Premium Tax Credit Explained

What the Premium Tax Credit is

The Premium Tax Credit (PTC) is a federal subsidy that reduces what you pay each month for a Marketplace health insurance plan. It was created by the Affordable Care Act and is administered by the IRS. The subsidy is paid directly from the federal government to your insurance carrier on your behalf, lowering your monthly premium.

You can choose to take the PTC in advance (Advance Premium Tax Credit, or APTC) — paid monthly to your carrier — or wait and claim it as a tax credit when you file your return. Most Marketplace enrollees take it in advance to keep their monthly premium low.

Who qualifies

PTC eligibility depends on:

• Household income (MAGI): between 100% and 400% of the Federal Poverty Level for your household size. The extra eligibility above 400% ended with the enhanced credits on December 31, 2025.
• Household size: determined by tax filing status (yourself, your spouse if married filing jointly, your tax dependents).
• Coverage purchased through the Marketplace: only Qualified Health Plans bought on HealthCare.gov or a state-based exchange qualify. Off-Marketplace purchases do not get PTC.
• Not eligible for other affordable coverage: if you have access to affordable employer coverage that meets minimum value standards, or are eligible for Medicare or Medicaid, you typically do not qualify for PTC.
• U.S. tax filing: you must file a federal tax return, even if you would not otherwise be required to file.

What changed: the 400% line is back for 2027

The short version: the enhanced premium tax credits ended on December 31, 2025, so for 2027 coverage the credit is for households with income from 100% to 400% of the federal poverty level. HealthCare.gov's glossary describes the credit the same way, as available in every state when income falls in that range.

For 2027 coverage the Marketplace uses the 2026 federal poverty guidelines. In the 48 contiguous states and D.C. that is $15,960 for one person, with $5,680 added for each additional person, so 400% works out to $63,840 for one person and $132,000 for a household of four. Alaska and Hawaii publish higher guidelines. Our guide to the 400% line for 2027 covers how Marketplace income is counted.

Two other details changed. The IRS publishes a new applicable-percentage table each year, and the one for 2027 plan years is in Rev. Proc. 2026-26. And for the 2026 tax year, the budget law removed the cap on how much of an excess advance credit has to be repaid, as the Kansas Health Institute reports. That makes the income estimate you give the Marketplace worth a second look.

How the subsidy amount is calculated

The PTC formula sets a maximum percentage of household income that you should have to pay for a benchmark plan (the second-lowest-cost Silver plan in your area). Your expected contribution is calculated as that percentage of MAGI; the subsidy is the difference between the benchmark premium and your expected contribution.

The IRS sets the maximum percentage of income each year in its applicable-percentage table, and the percentage rises as income rises. Lower-income households are expected to contribute a smaller share of income toward the benchmark plan, higher-income households a larger share, and the subsidy covers the rest of the benchmark premium. Above 400% of the poverty level, or where the expected contribution reaches the benchmark premium, no subsidy is available.

You can apply the PTC to any Marketplace metal tier (Bronze, Silver, Gold, Platinum). The subsidy amount is tied to the Silver benchmark, but you can use the credit toward a more or less generous plan — the difference between the chosen plan's premium and the subsidy becomes your monthly out-of-pocket premium.

Cost-Sharing Reductions (CSRs) on Silver plans

Households with income between 100% and 250% of FPL who enroll in a Silver-tier Marketplace plan get an additional benefit called Cost-Sharing Reductions. CSRs reduce deductibles, copays, and coinsurance — making out-of-pocket costs at the point of care substantially lower than the standard Silver plan would otherwise have.

Because CSRs are only available with Silver plans, choosing Silver tier is often financially advantageous for lower-income households even if Bronze has a lower premium. Read more in our metal tier guide.

Reconciliation at tax time

Your APTC is based on the income you estimated at enrollment. At tax time, the IRS reconciles the actual Premium Tax Credit you qualified for (based on your real income for the year) against what you received in advance.

Three possible outcomes:

• Estimated correctly: no further action; the APTC matched your actual PTC.
• Underestimated income: you got more APTC than you qualified for. You may owe the difference back. Starting with the 2026 tax year, the old repayment caps for households below 400% FPL no longer apply.
• Overestimated income: you got less APTC than you qualified for. You receive the difference as an additional refundable tax credit on your return.

The reconciliation lives on Form 8962 (Premium Tax Credit) and uses information from Form 1095-A that the Marketplace sends each year. Your tax preparer or software handles the calculation if you provide the 1095-A.

What happens if income changes mid-year

Report income changes to the Marketplace as they happen. The Marketplace recalculates your APTC and adjusts your monthly premium. Reporting changes promptly reduces the size of any reconciliation surprise at tax time and keeps your monthly premium aligned with current circumstances.

Common mid-year changes that affect APTC:

• Income increase or decrease
• Job change or loss
• Marriage, divorce, or change in tax filing status
• Birth, adoption, or death affecting household size
• Move to a different area
• Becoming eligible for other coverage (employer plan, Medicare, Medicaid)

Some of these changes also open a Special Enrollment Period to make plan changes — see our article on ACA Special Enrollment Periods.

Above the subsidy threshold

For households above the income level where subsidies end, Marketplace plans cost full premium. In that situation, comparing Marketplace plans against private insurance options at full premium can be worthwhile. Some private products are not minimum essential coverage and have specific limitations — they are not substitutes for ACA coverage, but they may fit narrow situations like healthy individuals between jobs or households comparing total cost. Always start by checking Marketplace eligibility, and keep in mind that income near the 400% line is worth estimating carefully.