ACA subsidies in 2026: the early retiree's guide to the returning subsidy cliff.

For early retirees, health insurance is often the single biggest budget line between retirement and Medicare. And in 2026, the rules of that game changed significantly: the enhanced premium tax credits that smoothed costs from 2021 through 2025 expired on December 31, 2025, and the old subsidy cliff is back.

If you retired early — or you're planning to — this is the most financially consequential policy detail of your pre-65 years. Here's how the 2026 rules work, why your income is more controllable than you think, and how Roth conversions interact with your health insurance bill.

What changed in 2026?

From 2021 through 2025, the American Rescue Plan and Inflation Reduction Act enhanced the ACA's premium tax credits: nobody paid more than 8.5% of income for a benchmark silver plan, and the old 400%-of-poverty income cap was effectively gone.

Those enhancements expired. For 2026, the original ACA structure is back:

• Premium tax credits are available only to households with income between 100% and 400% of the Federal Poverty Level (FPL).
• Above 400% FPL, credits drop to zero. Not gradually — entirely. One dollar over the line and the full credit disappears.
• Analysts at KFF (Kaiser Family Foundation) estimate that average premium payments for subsidized enrollees will more than double without the enhancements — a roughly 114% increase — with some households paying $10,000–$25,000 more per year.

KFF's own figures put a finer point on it: the enhanced credits had been saving subsidized enrollees an average of $705 a year, holding their typical annual premium to about $888 — without them, that figure moves back toward $1,593.

The commonly cited 2026 thresholds at 400% FPL:

These are the lines that now define your health insurance costs. And unlike in your working years, your income in early retirement is largely your choice — which is both the opportunity and the trap.

How ACA subsidies work: it's all about MAGI

Your premium tax credit is based on Modified Adjusted Gross Income — for ACA purposes, that's your AGI plus tax-exempt interest, non-taxable Social Security benefits, and a few other add-backs. The credit covers the difference between the benchmark silver plan premium in your area and the amount you're expected to contribute based on your income.

The critical insight for early retirees: you control your MAGI by choosing which accounts to draw from. A retiree with $2M who lives on Roth contributions and return-of-principal from a taxable account can show very little MAGI. The same retiree doing large Roth conversions or realizing capital gains can show a lot.

What counts toward ACA MAGI:

• Wages and self-employment income
• Roth conversion amounts (every dollar, taxed as ordinary income)
• Traditional IRA/401(k) withdrawals
• Capital gains and dividends — even gains taxed at the 0% rate still count
• Taxable Social Security benefits
• Interest, including tax-exempt interest (added back)
• Rental income

What does not count:

• Withdrawals of your original Roth IRA contributions
• Qualified Roth distributions after 59½
• Return of cost basis from a taxable account (only the gain counts)
• HSA withdrawals for qualified medical expenses
• Loan proceeds

Notice the asymmetry: a $50,000 year funded by selling taxable-account stock with $40,000 of basis generates only $10,000 of MAGI. The same $50,000 as a Roth conversion generates $50,000 of MAGI. Same spending, wildly different subsidy outcome.

Worked example: the $25,000 Roth conversion that cost $22,000

The reconciliation sting

There's a second trap layered on top. Most people don't pay full premiums and wait for a tax credit — they take advance premium tax credits during the year, based on estimated income, and reconcile at tax time.

If your actual MAGI ends up above 400% FPL, you repay the entire advance credit. There is no partial credit for being close. And starting in 2026, the repayment caps that used to limit how much excess advance credit lower-income households had to pay back have been removed — raising the downside of underestimating your income.

A December surprise — a mutual fund capital gain distribution, a bigger-than-expected freelance payment, a Roth conversion you forgot to count — can turn into a five-figure tax bill in April. Track MAGI during the year, not after it.

Strategies for the pre-65 years

• Fund spending from MAGI-invisible sources. Roth contribution withdrawals, taxable-account basis, and cash savings let you spend without generating MAGI. This is the core early-retirement playbook: keep reported income low while actual spending stays comfortable.
• Defer Roth conversions until Medicare. The years from 65 onward — after ACA subsidies end and before RMDs begin — are often the best conversion window anyway. Doing conversions at 60 while on marketplace insurance frequently means paying for the conversion twice: once in income tax, once in lost credits.
• If you convert during ACA years, stay under the cliff with margin. Leave a buffer — $3,000 to $5,000 — below the 400% FPL line for your household size. December distributions and interest are hard to predict exactly.
• Use HSA contributions to reduce MAGI. If you're on an HSA-eligible plan, contributions lower your MAGI dollar for dollar. Note that as of 2026, marketplace bronze and catastrophic plans can qualify as high-deductible plans for HSA purposes, widening this option.
• Harvest capital gains deliberately. Gains count toward MAGI even when taxed at 0%. If you're harvesting gains to reset basis, do it in a year you're already over the cliff — or keep the harvest small enough to stay under it.
• Model the whole bridge, not one year. The pre-65 period might be 5, 10, or 15 years. The optimal strategy often varies year by year: subsidy-maximizing years early, then aggressive conversions in the final years before Medicare — or vice versa, depending on your balances.
• Check whether a low-MAGI year also qualifies for the Saver's Match. The same low-income year that keeps you under the ACA cliff can also trigger a 50% federal match (up to $1,000) on retirement contributions starting in 2027 — a low-MAGI year is doing double duty if you have earned income to contribute.

When does the math favor skipping subsidies?

Honest nuance: maximizing ACA credits isn't always the right goal. If you have a very large traditional IRA balance and RMDs at 75 will push you into the 32% bracket, the lifetime value of big early conversions can exceed a decade of subsidies. A $20,000/year credit for 8 years is $160,000; avoiding 32% tax on $1M+ of RMDs can be worth more.

The right question isn't "how do I keep my subsidies?" It's "which strategy leaves me wealthier after tax over my whole retirement?" That requires modeling both paths — subsidies kept versus conversions done — over decades, not vibes.

How Runway models ACA credits alongside conversions

This is precisely the interaction that's hardest to get right by hand: every conversion dollar simultaneously changes your income tax, your ACA credit, your future RMDs, and (two years later) your IRMAA. Optimizing any one of them in isolation gives the wrong answer.

Runway Pro models ACA premium tax credits year by year as part of your plan — including the 400% FPL cliff — so the Roth conversion optimizer evaluates each conversion level net of lost subsidies. The bracket-by-bracket comparison shows you the true all-in cost: income tax plus foregone credits. In many pre-65 plans, the optimizer correctly recommends little or no conversion during ACA years and heavier conversions after 65 — and shows you the dollar value of that sequencing.

You can start in the free tier (no card required): Monte Carlo simulation, the 30-year projection table, withdrawal sequencing, and Social Security claiming guidance. If the interplay of conversions, credits, and IRMAA looks like it matters for your plan, Pro is $99/year with a 7-day free trial. Or start simpler: our free Roth conversion calculator (no signup) shows the basic now-vs-later tradeoff in under a minute.

The bottom line

1. The enhanced ACA subsidies expired end of 2025; the 400% FPL cliff is back for 2026 (~$62,600 single, ~$84,600 couple).
2. Above the cliff, credits go to zero — a $1-over miss can cost $15,000–$25,000/year.
3. Roth conversions count fully toward ACA MAGI; Roth contribution withdrawals and taxable-account basis do not.
4. During ACA years, precision beats ambition: stay under the cliff with a buffer, or defer conversions until Medicare.
5. Reconcile carefully — advance credits above the cliff must be repaid in full.