ACA Premium Tax Credit 2027 — Subsidy Cliff Calculator

How the ACA Premium Tax Credit works in 2027

The Premium Tax Credit (PTC) under IRC §36B is a refundable tax credit that helps low- and moderate-income households pay for ACA-marketplace health insurance. The credit equals the difference between (a) the second-lowest-cost Silver plan in your rating area (the "benchmark" plan) and (b) your expected contribution — a percentage of household income that scales with your income relative to the Federal Poverty Line (FPL).

For 2027 (CONUS), the FPL starts at approximately $15,650 for one person and adds $5,500 for each additional household member. A family of three with $55,000 household income is at 233% of FPL. The applicable percentage curve was rewritten by the 2021 ARP and extended by the 2022 IRA through tax year 2025 — flatter and lower, with a hard cap at 8.5% of income even at incomes above 400% FPL.

The returning "subsidy cliff" for 2026 and 2027

Unless Congress extends the IRA-enhanced subsidies, the pre-2021 ACA structure returns for tax year 2026 and 2027. Two things change. First, the applicable percentage at the low end rises back toward 2% of income (from the IRA-era 0%). Second, households with income above 400% FPL lose all subsidy — a hard "cliff" where one extra dollar of income can cost a family $10,000–$30,000 per year in lost subsidy. The OBBB did NOT extend the IRA subsidies; as of May 2026 the cliff returns absent fresh legislation.

This creates planning incentives near the 400% FPL line. A family of three with 2027 benchmark premium of $12,000 and income at 399% FPL gets a subsidy that wipes out most of the premium. The same family at 401% FPL gets zero subsidy and pays the full $12,000. Strategies: Traditional IRA / 401(k) deferrals, HSA contributions, business-loss harvesting, and timing of capital gains can keep MAGI under 400% FPL.

Landing Just Over the Cliff: The Levers You Still Have

The cliff is a repayment problem, not only a subsidy problem, and that distinction decides what you can do about it. Below the income limit, the amount of advance credit you must pay back at reconciliation is capped by a repayment limitation that scales with income and filing status. Once household income lands above the limit, that cap does not apply: you repay the entire advance premium tax credit paid on your behalf for the year, which for a family can be a five-figure line on a return that otherwise looked fine. Being a few hundred dollars over is therefore not a few hundred dollars worse — it is a discrete step. What matters is that the test uses modified adjusted gross income for the tax year, so it is still movable after the enrolment year has started and often right up to the filing deadline. Deductible retirement contributions, an HSA contribution if you are HSA-eligible, and for the self-employed a SEP or solo 401(k) contribution all reduce MAGI; some of these can be made after 31 December and still count for the prior year. Deferring an optional year-end distribution, bonus, or asset sale works the same way. Run your projected MAGI before year end rather than at filing, because by then several of these levers are gone. Repayment limitations and the reconciliation mechanics are set out in the IRS instructions for Form 8962, Premium Tax Credit.

Reconciliation on Form 8962

You can take the credit as an "advance" — paid directly to your insurer each month to lower premium — or wait and claim it on your return. Either way, when you file Form 8962, you reconcile the advance credit (from Form 1095-A) against the actual credit your final income entitles you to. If you took too much advance credit, you must repay the excess as additional tax. Repayment is capped for households under 400% FPL ($375–$3,250 per filer in 2026 thresholds, indexed). Above 400% FPL (post-cliff return), excess advance is repaid in full with no cap.

If you live in a non-Medicaid-expansion state and your income is below 100% FPL, you fall into the "coverage gap" — too rich for Medicaid in that state but too poor for marketplace subsidies under traditional rules. The IRA-era extension allowed under-100% FPL households to qualify for full marketplace subsidies; this also disappears at the IRA sunset.

Source: irs.gov — Form 8962 and Publication 974. Updated May 2026 reflecting OBBB (P.L. 119-21) and HHS 2027 Federal Poverty Guidelines.