The ACA Subsidy Cliff Is Back for 2026: What One Dollar Over Costs

The enhanced premium tax credits that ran from 2021 through 2025 have expired, and the ACA's original income limit is back for 2026 coverage. Household income above 400% of the federal poverty line means no premium tax credit at all. Not a smaller credit. None.

If you took that credit in advance during 2026, you pay it back on the return you file in early 2027. A second change, far less publicized, removed the caps that used to limit how much of an overpaid subsidy had to be returned. For tax year 2026 there is no repayment cap at any income level.

This page is about that mechanic and what can still be changed before December 31. For the arithmetic of the credit itself, see how the premium tax credit is calculated.

What changed on January 1, 2026

Two things happened, and they compound.

First, the enhanced credits applied to tax years 2021 through 2025 only. IRS Fact Sheet 2025-10, issued December 23, 2025, restates the general rule for every other year: eligibility runs to households with income "at least 100 percent but no more than 400 percent of the federal poverty line for their family size." It also states that the temporary removal of the 400% ceiling covered "tax years 2021 through 2025."

Second, section 71305 of the reconciliation law enacted July 4, 2025 struck the repayment limitation out of section 36B(f)(2), effective for taxable years beginning after December 31, 2025.

Several bills to restore the enhanced credits have moved through Congress since. As of September 2026 none has been enacted, so the law governing 2026 coverage is the law described here. A bill that has passed one chamber is not a rule anyone can plan around.

Where the cliff sits for 2026 coverage

The threshold is 400% of the federal poverty guideline for your household size, and the guideline year is not the one most people assume. Eligibility uses the guidelines most recently published on the first day of that coverage year's open enrollment. Open enrollment for 2026 coverage opened November 1, 2025, so 2026 coverage runs off the 2025 poverty guidelines, published by HHS in the Federal Register at 90 FR 5917 on January 17, 2025.

For the 48 contiguous states and the District of Columbia:

For households above eight, HHS adds $5,500 per person, moving the cliff by $22,000 each. Alaska and Hawaii have separate guidelines: the one-person cliff is $78,200 in Alaska and $71,960 in Hawaii, and for a family of four, $160,760 and $147,920.

Household income here means modified adjusted gross income as section 36B defines it, which is not the MAGI used for other credits on the same return. That definition gets its own section below.

What does one dollar over the line actually cost?

The credit does not shrink as you approach 400%. It is full size at 400.0% and gone one dollar later. Worksheet 2 of the Form 8962 instructions makes that literal: if income exceeds four times the guideline, you enter 401 on line 5 and stop.

The reason is structural. Below the line, the credit equals the cost of the benchmark silver plan minus a capped share of your income. Revenue Procedure 2025-25 sets that cap for 2026 at 9.96% of household income for everyone from 300% to 400% of the poverty line. Above 400%, the applicable percentage table simply has no row. No percentage, no credit.

A hypothetical, with round numbers. A single 58-year-old whose benchmark silver plan costs $1,000 a month, so $12,000 for the year:

• At $62,600 of MAGI, exactly 400% of the guideline, the expected contribution is 9.96% of $62,600, about $6,235. The credit is $12,000 minus $6,235, or $5,765 for the year.
• At $62,601 of MAGI, the credit is $0.

One dollar of income costs $5,765. If it was paid to the insurer in advance across twelve months, all $5,765 comes back on the 2026 return.

The same shape at family scale. A hypothetical family of four with a $2,000 per month benchmark plan, $24,000 for the year, at the $128,600 threshold: expected contribution about $12,809, credit about $11,191. One dollar over and that $11,191 is gone.

The repayment caps are gone, at every income level

This is the least known part of the story, and for most households the more dangerous one.

Through tax year 2025, if advance payments exceeded your actual credit, a table capped what you owed back, but only when the income reported was under 400% of the poverty line. Table 5 in the 2025 instructions for Form 8962 shows its last version.

Fact Sheet 2025-10 answers it directly: "There is no repayment cap for tax years after 2025. For tax years after 2025, you must repay the full amount by which your advance credit payments exceed your Premium Tax Credit."

The part easy to skim past: the caps are not merely irrelevant above 400%, where they never applied anyway. They are gone below 400% too. A household at 180% of the poverty line that underestimated January income and drifted up to 260% now repays the whole excess, where a year earlier it would have repaid at most $375 or $750. The cliff produces the largest bills. The repeal of the caps produces the most of them.

How the bill actually arrives

Nothing happens during 2026. The marketplace pays an advance credit to your insurer each month based on the income you estimated at enrollment, and your invoice reflects it. Nobody compares that estimate to reality until you file.

The sequence:

1. In January 2027 your marketplace issues Form 1095-A, showing month by month the premiums paid, the benchmark premium, and the advance credit paid on your behalf.
2. You carry those figures onto Form 8962 with your actual 2026 household income and family size.
3. If your allowable credit is less than what was advanced, the difference is excess advance payment, and for 2026 the full amount goes to Schedule 2 and is added to your total tax.
4. If it is more than what was advanced, the difference reduces your tax or increases your refund.

Anyone who received an advance payment must file a return and attach Form 8962, even with no other filing requirement.

Which levers still move MAGI before December 31?

Household income for the premium tax credit has its own definition. Per Fact Sheet 2025-10 it is adjusted gross income plus excluded foreign earned income, tax-exempt interest and the nontaxable portion of Social Security benefits, totaled across every family member required to file.

Two consequences follow:

• Anything deducted below the AGI line does nothing here. The standard deduction, itemized deductions and the qualified business income deduction all sit below AGI, so they cut taxable income and leave this MAGI untouched.
• Municipal bond interest and the untaxed portion of Social Security are added back, so they count against the threshold even though they never appear in taxable income.

What does move AGI, and therefore this MAGI:

• Deductible retirement contributions. Elective deferrals to a 401(k) or 403(b) reduce W-2 wages, but must be withheld from pay by December 31, which means telling payroll well before then. A deductible traditional IRA contribution reduces AGI and can be made up to the April 2027 filing deadline, though deductibility phases out if a workplace plan covers you. See the 2026 IRA contribution and income limits.
• HSA contributions, for anyone enrolled in a qualifying high deductible plan. Revenue Procedure 2025-19 sets the 2026 limits at $4,400 self-only and $8,750 family, plus $1,000 at age 55 or older, and the deadline runs to the filing deadline rather than December 31. The HSA contribution limit rules cover the eligibility tests.
• Self-employment deductions. A SEP IRA or solo 401(k) contribution, the deductible half of self-employment tax, and the self-employed health insurance deduction all reduce AGI, and the self-employment tax calculator gives the deductible half. One warning: the self-employed health insurance deduction and the premium tax credit are circular, each feeding the other, and IRS Publication 974 gives the iterative method for resolving them.
• Timing of self-employment income. A cash-basis business recognizes income when received, so invoicing in January rather than late December moves the receipt into 2027. That is a timing decision with its own cost: it raises 2027 MAGI and moves the same problem forward a year.

These are mechanics, not recommendations. Each carries trade-offs unrelated to health insurance, and shifting income across a year boundary to clear one threshold creates the same question a year later.

What people get wrong about the cliff

Not tracking income against the threshold until filing. The most expensive habit here. Annual income is knowable with reasonable accuracy by November, and December is the last month anything can change.

Taking a year-end bonus or a Roth conversion without checking the number first. Both land in AGI for the year received. The Roth conversion is the classic case: the amount is discretionary and often decided in the last week of December. Realizing a capital gain does the same thing, and how capital gains are taxed in 2026 covers what enters AGI.

Assuming the credit tapers. It does not. The applicable percentage table stops at 400% and there is no phase-out band above it.

Assuming a repayment cap will absorb the damage. For tax year 2025 that was frequently true. For tax year 2026 it is not true at any income level.

Assuming the marketplace will catch it. It cannot. It knows only the estimate it was given and keeps paying at that rate until someone updates it.

Forgetting that household income means the household. A spouse's mid-year raise, a filing-required dependent's earnings and a one-off traditional IRA withdrawal all count toward the same total.

Where this does not apply

• If you never took the credit in advance. With no advance payments there is nothing to reconcile and nothing to repay.
• If the coverage is not a marketplace plan. Employer coverage, Medicare, Medicaid, CHIP, TRICARE and VA coverage sit outside section 36B entirely.
• If household income is below 100% of the poverty line. That is a separate and older eligibility problem, not this one.
• If you live in Alaska or Hawaii. The table figures are wrong for you; the Alaska and Hawaii guidelines apply instead.
• State subsidy programs are a separate system. Several state-based marketplaces run their own affordability programs under state law, with their own income rules.
• The cliff limits the credit, not the coverage. A marketplace plan can still be bought above 400% of the poverty line. It just costs the full premium.

What to check before December 31

• Total a realistic 2026 MAGI: wages, self-employment profit, interest, dividends, realized gains, retirement distributions, plus tax-exempt interest and untaxed Social Security, for everyone in the tax family required to file.
• Compare that total to the 400% figure for your household size above and write down the headroom or overage.
• Sign in to your marketplace account and find the advance credit paid on your behalf so far in 2026. That is the amount at risk.
• List every discretionary December item: a bonus that can be deferred, a Roth conversion, a sale not yet executed, a distribution not yet taken.
• If you are over the line or close, work out whether a deductible contribution or a deferral closes the gap, and which must happen by December 31 rather than April.
• If income has risen since you enrolled, report it to the marketplace so the remaining months are paid at the correct rate.
• If you will land over the line, set the repayment aside now. Running an estimate of 2026 federal tax with the excess advance payment included keeps April 2027 from surprising you.

The reconciliation is arithmetic, and it is not negotiable once the year closes. Everything capable of changing the outcome has to happen while the year is still open.