Premium tax credit reconciliation: the ACA checks your homework

By Tom, CPA · Updated October 25, 2026

TL;DR: Advance premium tax credits are an estimate. Form 8962 compares them to the credit you actually earned based on final income. Starting with 2026, excess advance credits must be repaid in full, so accurate estimates and mid-year updates matter more than ever.

Educational only, not tax, legal, or investment advice. Examples are illustrations, not predictions. Rules and limits change; verify current figures and talk to a qualified professional about your situation.

The ACA asks to see your homework at tax time. All year, the marketplace paid part of your premium straight to your insurer based on the income you said you'd have. In spring, the IRS asks what income you actually had and settles the difference. Under-promise and you get a refund. Over-promise and you write a check.

For early retirees, whose income is a series of choices rather than a salary, reconciliation is where good planning gets graded. This guide walks through the vocabulary, the form, what changed for 2026, mid-year life changes, and the habits that keep April boring.

CPA Warning Label: Form 1095-A arrives in your mailbox, not your inbox of priorities. Losing it doesn't make the reconciliation go away.

APTC vs PTC

• APTC (advance premium tax credit) is the amount paid to your insurer each month during the year, based on your estimated income and household.
• PTC (premium tax credit) is the amount you were actually entitled to, computed after year-end from your real income and household.

If PTC exceeds APTC, the difference is a refundable credit on your return. If APTC exceeds PTC, the excess is added to your tax. Anyone who received APTC must file a return and attach Form 8962, even if they otherwise wouldn't need to file. Skipping it can make you ineligible for advance credits in future years.

Form 8962 walk-through

You'll need Form 1095-A, which the marketplace issues for each policy. It shows three monthly columns: the premium of your plan, the premium of the benchmark (second-lowest-cost silver) plan, and the advance credit paid.

1. Family size and household income. Enter the people in your tax family and your MAGI, which is AGI plus tax-exempt interest, non-taxable Social Security and excluded foreign income.
2. Income as a percentage of FPL. Use the poverty guideline for the prior year (for 2026 coverage, $15,650 for one person, $21,150 for two, in the lower 48).
3. Applicable percentage and annual contribution. From the 2026 table in Rev. Proc. 2025-25, ranging from 2.10% to 9.96%.
4. Annual or monthly calculation. If coverage and benchmark were the same all year, you can compute annually. Otherwise you go month by month.
5. Compare. The form totals your PTC and APTC and produces either a net credit or excess APTC.

Check the benchmark column. If you added or removed someone mid-year and the marketplace didn't reflect it, the 1095-A benchmark may be wrong, and the marketplace's tax tool can look up the correct figure.

Repayment caps: gone starting 2026

Until 2025, households with income under 400% of FPL had their repayment of excess APTC capped at amounts tied to income. That softened the blow of a bad estimate. Federal law now removes those limitations for tax years beginning after December 31, 2025. As of Oct 25, 2026, that means:

• For 2026 coverage, excess advance credits are generally repayable in full, no matter your income.
• If your final income lands above 400% of FPL, you are not eligible for any PTC, so all APTC becomes repayable.

This one change transforms reconciliation from a nuisance into a real risk. A couple getting $1,000 a month of APTC who crosses the cliff in December can owe $12,000 with their return.

Mid-year changes

Report changes to the marketplace within the year so advance payments adjust. Common triggers:

• Income changes: a consulting gig, a larger-than-planned Roth conversion, a property sale.
• Household changes: marriage, divorce, a birth, a child aging off as a dependent.
• Medicare eligibility: once someone is eligible for premium-free Part A, they can't get marketplace savings, and marketplace coverage does not end automatically. You can report a Medicare start date up to 3 months ahead.
• Moving: a new ZIP code can change the benchmark plan.

Marriage and divorce have special allocation rules on Form 8962. If either happened during the year, read the form instructions carefully before you file.

Illustration: two ways to end the year

Illustration: Lavish Larry, single, 62, estimated 2026 MAGI of $45,000. Assume his benchmark plan costs $9,000 a year. At 287.5% of FPL his applicable percentage is about 9.58%, an expected contribution of about $4,312, so his APTC is about $4,688 for the year ($391 a month).

Version A, he updates. In September Larry takes a consulting project that will add $8,000. He reports it. His new estimate is $53,000 (338.7% of FPL, 9.96%), expected contribution about $5,279, full-year credit about $3,721. The marketplace lowers his remaining advance payments so the total lands near the new figure. At tax time, little or nothing is owed.

Version B, he doesn't. Larry keeps collecting $391 a month, then makes a $15,000 December Roth conversion on top of the consulting. Final MAGI: $68,000, which is 434.5% of FPL. PTC: $0. He received $4,688 of APTC and must repay all of it. Under the old caps, part of that would have been forgiven. In 2026, it isn't.

Special situations worth a second look

• Shared policies. If one 1095-A covers people who file separate returns, such as a former spouse or an adult child who files on their own, the form requires an allocation of premiums and credits between returns. Agree on percentages before either person files.
• Married filing separately. Generally, married people must file jointly to claim the credit. Narrow exceptions exist for victims of domestic abuse or spousal abandonment.
• Mid-year Medicare. Months in which someone was eligible for premium-free Part A generally aren't eligible months for that person's credit, even if the marketplace kept paying. Ending the marketplace plan on time avoids a repayment.
• Self-employed health insurance deduction. If you have self-employment income, the deduction and the credit interact, because the deduction lowers MAGI, which raises the credit, which lowers the deductible premium. IRS publications provide an iterative method. Tax software handles it, but only if you tell it about both.
• Income below 100% of FPL. If your actual income ends up below 100% of FPL, you may still keep eligibility for the year if you received APTC based on a reasonable estimate above it. Document why your estimate made sense.

A reconciliation-ready record system

Keep a single folder per coverage year with: the marketplace eligibility notice, your income worksheet, every change you reported and its date, monthly premium statements, and Form 1095-A. Add the final MAGI number from your return. Next fall, that folder becomes the starting point for your new estimate, which means each year gets a little more accurate and a lot less stressful.

Software note: most tax programs ask for the 1095-A figures and do the math. They do not know whether the figures are right. Garbage in, Form 8962 out.

Avoiding a surprise

• Estimate conservatively. A slightly high income estimate means smaller advance credits and a likely refund. A low estimate is a loan you'll repay.
• Do Roth conversions late. Convert in November or December, after you've seen the year's other income.
• Know your ceiling. Compare final MAGI to the 400% line before any year-end move. The subsidy cliff guide shows the numbers.
• Bank the gap. If you choose to take advance credits based on a lower estimate, park some cash for possible repayment.
• Keep paperwork. Save your marketplace application, updates and the 1095-A. Ask the marketplace for a corrected form if anything looks off.

For the levers that set MAGI in the first place, see ACA MAGI management. If you're comparing COBRA to marketplace coverage, see COBRA vs ACA.