8 min read · Last updated August 10, 2026
- The IRS states that for tax years after 2025 there is no repayment cap on excess advance premium tax credit, and the total difference is added to your balance due.
- The 400% of federal poverty line eligibility limit is back, because the temporary rule that removed it applied only to tax years 2021 through 2025.
- For 2027 coverage, 400% of the poverty line is $63,840 for one person and $86,560 for two in the 48 contiguous states and DC.
- Crossing that line by $3,000 can cost a full year of subsidy, which works out to $2.85 of repayment for every extra dollar earned in the crossing band.
In this article
- What changed for tax years after 2025
- The number that decides everything
- Sizing your own exposure before November 1
- If your 2026 estimate is already wrong
- Building an estimate you can defend
- Frequently asked questions
Last November, Renata typed $61,000 into her Marketplace application as her expected household income, and she has been taking $712 a month in advance premium tax credit ever since. She is 54, self-employed, and lives alone. In June two contracts landed at once and her real number started moving toward $70,000. Open enrollment for 2027 coverage under the Affordable Care Act (ACA) begins November 1, and the estimate she types into that application is now a much bigger decision than it was two years ago.
What changed for tax years after 2025
Advance premium tax credit is a subsidy paid to your insurer during the year, based on an income you estimate before the year starts. At tax time you reconcile: if you earned less than you estimated, you get the difference back, and if you earned more, you repay it.
Two protections used to soften the second half of that sentence. Both are gone.
The first was a repayment cap. The IRS Questions and Answers on the Premium Tax Credit sets out the change in one sentence: “for tax years after 2025, if your allowable credit is less than your advance credit payments, there is no repayment cap and the total difference will be subtracted from your refund or added to your balance due.” For tax years before 2026 a cap tied to household income limited how much of an overshoot you had to hand back. That cap no longer exists at any income level.
The second was the suspension of the income ceiling. The same IRS page explains that Congress removed the 400% of federal poverty line eligibility limit only “for tax years 2021 through 2025.” That window has closed. The ordinary rule is back: household income at least 100% but no more than 400% of the poverty line.
Put together, they produce a hard edge. Land a dollar over 400% and your allowable credit for the year is zero, every dollar of advance credit you received becomes repayable, and nothing limits the amount.
The number that decides everything
Which year’s poverty guidelines apply is not a detail. Treasury regulation 26 CFR 1.36B-1(h) fixes it: the federal poverty line for a taxable year is the one in effect on the first day of the open enrollment period preceding that year. Open enrollment for 2027 coverage opens November 1, 2026, so 2027 runs on the 2026 poverty guidelines published by the Department of Health and Human Services.
| Household size | 100% of poverty line | 400% of poverty line | Cost of crossing 400% at $700/month in advance credit |
|---|---|---|---|
| 1 person | $15,960 | $63,840 | $8,400 repaid |
| 2 people | $21,640 | $86,560 | $8,400 repaid |
| 3 people | $27,320 | $109,280 | $8,400 repaid |
| 4 people | $33,000 | $132,000 | $8,400 repaid |
Notice what the last column does not do: it does not scale with income. A household $200 over the line and a household $20,000 over the line repay the same full year of credit. The penalty is a step, not a slope.
Sizing your own exposure before November 1
Two inputs, one multiplication. Take the monthly advance credit shown on your Marketplace account or your Form 1095-A, multiply by the number of months you will be enrolled, and that is your maximum exposure if your income crosses 400%.
Renata’s math for 2027, using her current $712 a month:
$712 × 12 = $8,544 of advance credit for the year
Her 400% threshold as a household of one is $63,840. So:
- Income lands at $63,000, which is 394.7% of the poverty line. She stays eligible and reconciles a modest difference.
- Income lands at $66,000, which is 413.5%. Her allowable credit is zero, and the full $8,544 is due with her return, uncapped.
The gap between those two outcomes is $3,000 of income and $8,544 of tax.
$8,544 ÷ $3,000 = $2.85 repaid for every additional dollar earned in that band
That is the calculation to run in October, before you type a number into an application. If your income is genuinely unpredictable and could straddle the line, there are two honest options. Estimate on the high side and take less credit up front. Or take no advance credit at all and claim the whole thing on your return once the year’s income is known. Both feel expensive in January. Neither one can produce a five-figure surprise in April.
If your 2026 estimate is already wrong
Renata’s 2027 decision is not her most urgent one. Her 2026 estimate is live right now, and the no-cap rule applies to tax year 2026, not just to 2027.
She has until December 31 to shrink that exposure, and the mechanism is a change report rather than a form. HealthCare.gov is direct about why reporting matters: if your income estimate goes up and you do not report it, “you’ll have to pay the difference back between the amount you used and the amount you actually qualify for when you file your federal tax return.”
Reporting a higher income mid-year lowers the advance credit applied to your remaining months. Your monthly premium goes up immediately, which is the part nobody enjoys. In exchange, the total advance credit you received for the year drops, and the amount you can owe at reconciliation drops with it. Reporting in August affects five months of premium. Reporting in December affects one.
This mistake causes people to say nothing and hope the year evens out, and under the old capped rules that was sometimes a defensible gamble. It is not one anymore. Update the application the same week your income changes, not at the end of the year.
Building an estimate you can defend
The application asks for expected household income for the coverage year, which for most people means modified adjusted gross income for everyone on the tax return. Build it from documents rather than memory.
Start with last year’s return as the base. Then adjust for what you already know: a raise with a known effective date, a contract that ended, a spouse starting work, a retirement distribution you plan to take. If you are self-employed, use net profit after expenses rather than gross receipts, and include the income of any tax dependent who has to file.
Then do one thing most people skip. Take your estimate, add 15%, and check whether that figure still sits under 400% for your household size using the table above. If it does, you have room. If it does not, you have identified the risk before it costs you anything, and you can decide deliberately how much advance credit to take rather than accepting the maximum by default.
Two related decisions sit next to this one. If you also have an offer of employer coverage, the affordability test determines whether you can use Marketplace subsidies at all. If your circumstances change outside the November window, the qualifying events that open a special enrollment period are the list to check first, and there are still options if you miss open enrollment entirely.
Frequently asked questions
What happens if I earn one dollar over 400% of the poverty line?
Your allowable premium tax credit for the year becomes zero, so every dollar of advance credit paid on your behalf is repayable. For tax years after 2025 no cap limits that amount. This is why the 400% figure for your household size is the single number worth memorizing.
Can I lower what I owe by reporting an income change now?
Yes. Reporting a higher income mid-year reduces the advance credit applied to your remaining months, which lowers the total you received and therefore the amount you reconcile. Your monthly premium rises right away. Reporting in August adjusts five months of coverage; waiting until December adjusts one.
Is it smarter to take no advance credit at all?
If your income is unpredictable near the 400% line, take it. You pay the full premium monthly and claim the entire credit on your return once the year’s income is known. The cost is cash flow. The benefit is that an uncapped repayment cannot happen to you at all.
Do the 2026 poverty guidelines really apply to 2027 coverage?
Yes. Treasury regulation 26 CFR 1.36B-1(h) sets the applicable poverty line as the one in effect on the first day of the open enrollment period before that tax year. Enrollment for 2027 opens November 1, 2026, so the 2026 guidelines govern 2027 eligibility.