ACA Premium Tax Credits in 2026: How Subsidies Are Calculated

If you buy your own health insurance through the Affordable Care Act (ACA) Marketplace, the premium tax credit is probably the single biggest factor in what you pay each month. It is a government subsidy that lowers your premium based on your income and the cost of coverage where you live, and most Marketplace enrollees qualify for at least some of it. The key idea is simple: the law decides how much you should reasonably be expected to pay for a benchmark plan, and the tax credit covers the rest. Understand that one sentence and the rest of the system falls into place.

This guide breaks down exactly how the advance premium tax credit is calculated for 2026: the role of the benchmark plan, how your "expected contribution" is set as a percentage of your income, how the federal poverty level creates the income bands that drive everything, and how the credit gets reconciled at tax time on Form 8962. We will also cover the major change for 2026 — the expiration of the enhanced subsidies — and what it means for the return of the so-called subsidy cliff. Where a figure is set annually, we say so, and you should always confirm the current-year numbers on HealthCare.gov.

What the premium tax credit is

The premium tax credit (PTC) is a refundable federal tax credit that reduces the cost of Marketplace health insurance. You can take it in one of two ways. Most people take it in advance — the advance premium tax credit, or APTC — which sends the money straight to your insurer every month so your premium bill is smaller right away. Alternatively, you can pay full price during the year and claim the entire credit as a lump sum when you file your taxes. Either way, the amount you are entitled to is calculated the same way, and either way it is ultimately settled on your tax return.

Eligibility has a few basic rules. Your household income generally must fall within a qualifying range tied to the federal poverty level, you cannot be eligible for other qualifying coverage such as affordable job-based insurance or Medicaid, you must file a federal tax return, and if married you generally must file jointly. Assuming you clear those gates, the size of your credit comes down to a straightforward subtraction.

The benchmark: the second-lowest-cost Silver plan

Everything hinges on a reference plan called the benchmark, which is the second-lowest-cost Silver plan (often abbreviated SLCSP) available to your household in your local area. The government does not base your credit on whatever plan you actually pick; it bases it on the price of that benchmark Silver plan. This is deliberate. It ties the subsidy to a mid-level plan in your own market, so the credit is larger where coverage is expensive and smaller where it is cheap.

Here is the mechanic that trips people up: your credit is a fixed dollar amount equal to the benchmark premium minus your expected contribution. You can then apply that same dollar amount to any metal tier you choose. Buy a cheaper Bronze plan and your out-of-pocket premium shrinks, sometimes to very little. Buy a pricier Gold plan and you pay the difference above the benchmark. The credit itself does not change when you switch plans — only your net premium does.

Your expected contribution: a percentage of income

The law assumes you can afford to pay some share of your income toward the benchmark plan before help kicks in. That share is your expected contribution, and it is set by a sliding scale called the applicable percentage. The lower your income relative to the poverty level, the smaller the percentage; the higher your income, the larger it grows. The IRS publishes the exact percentages each year. For 2026, they run on roughly this schedule:

To find your credit, the Marketplace takes your expected contribution as an annual dollar figure, divides by twelve for a monthly amount, and subtracts it from the monthly benchmark premium. Whatever is left is your monthly premium tax credit. If your income is low enough that your expected contribution is smaller than the benchmark premium — which is common — you get a credit; if it is somehow larger, you get none. Because these applicable percentages are reset every year, treat the figures above as the 2026 schedule and confirm the current numbers before you rely on them.

The income bands built on the federal poverty level

The percentages above are expressed relative to the federal poverty level (FPL), the annual income benchmark the government updates each year and adjusts for household size. Marketplace eligibility for a given plan year uses the poverty guidelines from the prior year, so 2026 coverage is measured against the 2025 poverty guidelines. For the 48 contiguous states and Washington, D.C., those were approximately:

• $15,650 for a household of one
• $21,150 for a household of two
• $26,650 for a household of three
• $32,150 for a household of four (add about $5,500 for each additional person)

Alaska and Hawaii use higher figures. To convert your income to a percentage of the poverty level, divide your annual household income by the guideline for your family size. A single person earning about $31,300, for example, is at roughly 200% of the poverty level. That percentage is what places you on the sliding scale above. One important interaction: in states that expanded Medicaid, adults below 138% of the poverty level generally qualify for Medicaid rather than Marketplace subsidies, so the premium tax credit typically becomes relevant above that threshold.

A worked example

Imagine a single 40-year-old with a 2026 household income of about $31,300 — roughly 200% of the poverty level. On the 2026 scale, the expected contribution at 200% is about 6.6% of income, or roughly $2,066 for the year, which is about $172 per month. Suppose the benchmark second-lowest-cost Silver plan in this person's area costs $520 a month.

Monthly premium tax credit = $520 benchmark − $172 expected contribution = $348 per month.

That $348 credit can be applied to any plan. If our shopper picks the benchmark Silver plan, they pay about $172 a month. If they choose a cheaper Bronze plan priced at $410, they pay only $62 a month after the credit. If they prefer a $600 Gold plan, they pay $252. The credit stays $348 in every case — only the net premium moves. This is why it always pays to compare tiers after your subsidy is applied, not before.

Advance payments and reconciling on Form 8962

When you enroll, you estimate your income for the coming year, and the Marketplace uses that estimate to calculate your advance credit. Because it is based on a projection, the advance amount is provisional. At tax time you settle up. The Marketplace — HealthCare.gov or your state exchange, not your insurance company — sends you Form 1095-A by January 31, and it reports the premiums you paid, the benchmark premium, and the advance credit that went to your insurer each month. If it never arrives or looks wrong, ask the Marketplace for a corrected copy; your insurer cannot issue or fix it. You then complete Form 8962 to compare the advance credit you received against the credit you actually qualified for based on your final income.

The reconciliation cuts both ways. If you earned less than expected, you likely qualified for a larger credit and can claim the difference — increasing your refund or lowering your tax. If you earned more than expected, you received too much advance credit and may have to repay some of it. Because of this, it is wise to update the Marketplace promptly whenever your income or household changes during the year — a raise, a new job, a marriage, or a new baby — so your advance credit stays close to what you will ultimately be owed. Note too that if you take advance payments, you are required to file a tax return and complete Form 8962, even if you would not otherwise have to file.

What changed for 2026

For plan years 2021 through 2025, temporary enhanced premium tax credits made subsidies far more generous. They lowered the expected-contribution percentages across the board, set the contribution to 0% for the lowest incomes, and — most notably — removed the old income ceiling so that people above 400% of the poverty level could still qualify if the benchmark plan cost more than 8.5% of their income. Those enhancements were enacted temporarily and expired at the end of 2025.

Unless Congress acts to restore them, 2026 reverts to the original ACA formula, which has three practical effects. First, expected-contribution percentages are higher, topping out near 9.96% rather than 8.5%, so many people pay more toward the benchmark. Second, the lowest-income enrollees who previously contributed nothing now owe a small percentage of income. Third, and most consequential, the 400% subsidy cliff returns: households earning above 400% of the poverty level generally receive no premium tax credit at all in 2026, even if premiums are a large share of their budget. This last point is the difference between a manageable bill and full price for people just over the line. Legislative proposals to extend the enhanced credits have been debated, so if your income is near or above 400% of the poverty level, check the current status and your actual 2026 numbers on HealthCare.gov before assuming you do or do not qualify.

The bottom line

The premium tax credit works by subtraction: the Marketplace prices a benchmark second-lowest-cost Silver plan, decides your expected contribution as a percentage of income set by the federal poverty level, and covers the gap. You can take that credit in advance to lower monthly premiums or as a lump sum at tax time, but either way you reconcile it on Form 8962 using the Form 1095-A your insurer provides. The big shift for 2026 is the expiration of the enhanced subsidies, which raises expected contributions and brings back the 400% income cliff. Estimate your income carefully, report changes during the year, and confirm the current-year poverty guidelines and applicable percentages on HealthCare.gov — because those figures are updated annually and drive every dollar of your credit.