ACA Subsidy Cliff 2027: What $1 Over Costs at Every Age, 50 to 64

The 2027 cliff, age by age

Somebody retires at 60 with a pension, a small IRA draw and a plan to live on about $63,000. They estimate it on the marketplace application in November. In March they sell some fund shares to cover a new roof, and the year closes at $64,100. That last $260 decides whether a year of coverage costs about $6,400 or nearly $18,000. The table shows the gap at every age.

Why your age changes the cliff and the line doesn't

The income line depends only on household size. The price doesn't. Insurers may charge a 64-year-old up to three times what they charge a 21-year-old, and most states follow the federal default age curve, which climbs fastest after 50. Under the line, the subsidy pays everything above your capped share, so it grows as you age and the plan gets dearer. Over the line, it's gone, and you're paying the whole price at an age when that price is highest.

That's why the cliff hits people in their late 50s and early 60s hardest. A 30-year-old a dollar over may lose a few hundred dollars, or nothing, because their full price is close to their capped share anyway. A 62-year-old loses five figures.

What these numbers assume

• The benchmark is a national average. KFF puts the 2027 benchmark silver plan at $703 a month for a 40-year-old, up from $625 in 2026, averaged across counties from HealthCare.gov and state marketplace data. Each age is scaled from that figure by the CMS default curve (age 40 = 1.278, age 64 = 3.000). Your county's benchmark can be far above or below it, and the cliff scales with it: a pricier county means a bigger loss.
• Check your state. A few states set their own age curve, and Alaska and Hawaii have their own, higher poverty lines (400% for one person is $79,800 in Alaska and $73,440 in Hawaii for 2027 coverage). The only number that counts is the benchmark for your ZIP code on HealthCare.gov or your state’s marketplace.
• A couple here is two people the same age, both on the plan, household of two. Children in the house raise the line, and the 400% rule still applies.
• Income means MAGI: adjusted gross income plus tax-exempt interest and the untaxed part of Social Security. IRA withdrawals, Roth conversions and capital gains all count.
• Exactly 400% still qualifies. The IRS table’s top band runs “at least 300% but not more than 400%” (Rev. Proc. 2026-26). The cliff starts at the first dollar above it.

How people stay under the line

1. Spend from cash and Roth first in your marketplace years. Qualified Roth withdrawals don't count as income. Traditional IRA withdrawals do, dollar for dollar, and so does a Roth conversion.
2. Time the gains. Splitting a big sale across two tax years, or holding it for a year you're off the marketplace, keeps one gain from pushing one year over.
3. Use the deductions that lower MAGI. A traditional IRA contribution (it needs earned income) or an HSA contribution (it needs an HSA-eligible plan) lowers the number the subsidy is measured on. So do self-employment deductions.
4. Plan to a buffer, not the line. Aim a few thousand dollars under, because a stray 1099 or a fund's year-end payout lands after you've already planned the year.

How we calculated this

• Income line: 4 × the 2026 HHS poverty guidelines ($15,960 for one person, $21,640 for two, 48 states and DC), which set 2027 marketplace subsidies.
• Your share at the line: 10.22% of income, the top 2027 applicable percentage in IRS Rev. Proc. 2026-26.
• Full price: KFF’s 2027 average benchmark premium for a 40-year-old ($703 a month), multiplied by the age factor ÷ 1.278 from the CMS federal default age curve, times 12, times two for a couple.
• Lost at +$1: full price minus your share at the line, which is the whole subsidy. Every row was produced by the same code that runs our calculator, then three rows were checked by hand against the sources above.
• Figures checked November 5, 2026. This is an estimate for planning, not tax advice.

This week: open HealthCare.gov's preview tool, enter your ZIP code and age, and write down your county's 2027 benchmark silver price. That's the number that tells you what your own cliff costs.

Keep reading

• Health Insurance Before Medicare: Your Options Before 65 — Retiring before 65 leaves a coverage gap until Medicare. The four ways to bridge it — and why your income is the biggest lever in 2026.
• The Best Health Insurance Books for Early Retirees (2026): What to Read Before You Retire at 58 — Nearly every retirement healthcare book starts at 65 — the day your problem ends. What actually covers the gap before Medicare, compared honestly, plus the free sources that beat a book.
• Medicare Open Enrollment: Dates and What You Can Change — Medicare open enrollment runs October 15–December 7 and changes take effect January 1. What you can change in the fall Annual Enrollment Period, the January–March Advantage window, and how to decide whether your current plan still fits.
• Retirement Checklist: What to Do in the 5 Years Before You Retire — The pre-retirement checklist for the five-year countdown — confirm your income covers real spending, solve healthcare before and at 65, time Social Security, clear debt, and get the documents done — in priority order, not a random to-do list.