How ACA Subsidies Work in 2026 (Premium Tax Credits, Explained)

What an ACA subsidy actually is

The "subsidy" most people mean is the premium tax credit (PTC) created by the Affordable Care Act. It's available when you:

• buy a health plan through the Marketplace (HealthCare.gov or your state's exchange),
• have household income in the eligible range (see below), and
• aren't eligible for other qualifying coverage like Medicaid, Medicare, or an affordable employer plan.

It's a refundable tax credit, which is why you can receive it even if you owe no tax. And it's tied to your income, not your age or health — the calculation below is the same whether you're 25 or 60.

The formula, in five steps

Under the hood, HealthCare.gov and the IRS use the same arithmetic every year:

1. Find your income as a percent of the poverty level. Divide your household's expected Modified Adjusted Gross Income (MAGI) by the Federal Poverty Level (FPL) for your household size. (Note: a coverage year uses the prior year's guidelines — 2026 coverage uses the 2025 FPL.)
2. Look up your "applicable percentage." Your %FPL maps to a required-contribution percentage on the IRS schedule — from 2.10% at the low end up to 9.96% for 2026, sliding up as income rises (IRS Rev. Proc. 2025-25).
3. Compute your expected contribution. Your MAGI × that percentage = what you're expected to pay toward the benchmark plan for the year.
4. Find the benchmark premium. The annual premium of the second-lowest-cost Silver plan available to your household.
5. Subtract. Premium tax credit = benchmark premium − expected contribution (never less than zero).

The elegant part: because your expected contribution is fixed as a share of income, the credit automatically absorbs the difference between what a plan costs in your area and what you can afford. In a high-premium county the credit is larger; in a low-premium county it's smaller.

A worked example

Take a single 40-year-old with an expected 2026 MAGI of $45,000, in the 48 contiguous states:

1. %FPL: $45,000 ÷ $15,650 (2025 FPL for a household of one) = 287% of poverty.
2. Applicable percentage: 287% falls in the 250–300% band, which slides from 8.44% to 9.96%. Interpolated, that's about 9.58%.
3. Expected contribution: $45,000 × 9.58% ≈ $4,311 per year (about $359/month).
4. Benchmark premium: say the second-lowest-cost Silver plan runs $600/month, i.e. $7,200/year (this varies a lot by location — your calculator uses the real figure).
5. Premium tax credit: $7,200 − $4,311 = $2,889 per year, roughly $241/month.

Illustrative only — the benchmark premium depends on your county and the plans offered there. Run your own numbers in the calculator for a figure tied to your location.

Who qualifies in 2026

Three things decide eligibility: your income, your access to other coverage, and where you live.

• Income between 100% and 400% of FPL. For a household of one that's about $15,650 to $62,600; for a household of four, about $32,150 to $128,600 (2025 FPL, used for 2026 coverage).
• The 400% cliff is hard in 2026. One dollar over 400% and the credit is $0 (more on this below).
• Below 100% of FPL, it depends on your state: in states that expanded Medicaid, adults up to 138% of FPL generally get Medicaid instead; in states that didn't expand, people under 100% can fall into a coverage gap.
• No affordable other coverage. You generally can't get a credit for a month you were eligible for Medicaid, Medicare, or an employer plan deemed affordable.
• Cost-sharing reductions (lower deductible and copays) are a separate help, available at or below 250% of FPL on a Silver plan — 94% / 87% / 73% actuarial-value Silver at ≤150% / ≤200% / ≤250% of FPL.

What changed for 2026

2026 is a notably worse year for Marketplace affordability than 2021–2025, for two reasons:

• The enhanced subsidies expired. The American Rescue Plan (2021) and Inflation Reduction Act temporarily lowered the required-contribution percentages and removed the income cap. Those expired December 31, 2025, so 2026 reverts to the pre-2021 schedule — meaning higher expected contributions at most income levels.
• The 400% cliff returned. From 2021–2025 there was no hard cap; people over 400% of FPL could still get a credit if the benchmark plan cost more than 8.5% of their income. In 2026 that's gone — over 400% of FPL, the credit is zero.
• The repayment cap was removed. Under the One Big Beautiful Bill Act (OBBBA), starting in 2026 there's no longer a cap on how much excess advance credit you repay if your income comes in higher than estimated. See below.

If your income is near 400% of FPL, this is the year to estimate carefully — and to know that pre-tax contributions (retirement, HSA, the self-employed health-insurance deduction) can pull your MAGI back under the cliff.

The benchmark plan (SLCSP)

Your credit is sized off one specific plan: the second-lowest-cost Silver plan (SLCSP) available to your household. A few things people get wrong:

• It's not the plan you have to buy. The government uses the benchmark's price only to calculate your credit. You can apply the credit to any metal level — buy a cheaper Bronze plan and you pay even less; buy Gold and you pay the difference.
• It varies by county. The same household can have a very different benchmark — and therefore a different credit — one county over.
• Age and family size matter for the dollar amount (premiums rise with age on the federal age curve), but not for the percentage of income you're expected to contribute.

Advance credit & paying it back

You choose how to take the credit:

• In advance (APTC): the Marketplace pays it straight to your insurer each month, lowering your premium. This requires estimating your income for the year ahead.
• At tax time: take none (or only part) in advance and claim the credit as a refund when you file.

Either way, you reconcile on IRS Form 8962: your actual income is compared to your estimate. If you took too little in advance, you get the rest as a refund. If you took too much, you repay the difference — and for 2026, there's no longer a cap on that repayment if your income ends up over 400% of FPL. That's the strongest argument for estimating conservatively or taking less in advance.

What income counts (MAGI)

Marketplace subsidies use Modified Adjusted Gross Income for your whole tax household: your Adjusted Gross Income, plus tax-exempt interest, excluded foreign income, and the non-taxable portion of Social Security benefits. It's your estimated income for the coverage year — 2026 income for 2026 coverage, not last year's.

Heads up: "MAGI" is defined differently for Medicare's IRMAA surcharge (it doesn't add back Social Security). If you're comparing the two, don't reuse the same number.

Sources

• IRS — Rev. Proc. 2025-25 (2026 applicable percentages & affordability figures)
• IRS — The Premium Tax Credit — The Basics and About Form 8962
• HealthCare.gov — Save on monthly premiums and the premium tax credit glossary
• HHS / ASPE — Federal Poverty Guidelines (2025, used for 2026 coverage)
• IRS — Publication 974, Premium Tax Credit

See how we turn these into numbers on our methodology page. Estimates here are for general education, not tax or insurance advice; confirm your figures on the Marketplace.

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