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What you need to know before Medicare at 65
For most early retirees under 65, health insurance is the biggest financial wildcard. You're off your employer's plan, not yet eligible for Medicare, and facing individual market premiums that can run $500–$1,500 per month without help. The Affordable Care Act's marketplace subsidies can cut those costs dramatically — sometimes to near zero — but only if you manage your Modified Adjusted Gross Income (MAGI) carefully.
Getting this right is worth thousands of dollars per year. A 55-year-old on a Silver plan might pay a full unsubsidized premium of $800–$1,000 per month. Managed correctly, that same plan can cost $50–$200. The difference comes down to one number: your MAGI relative to the Federal Poverty Level.
The ACA's premium tax credits are available to people with MAGI between 100% and 400% of the Federal Poverty Level. At 400% FPL, you hit what's known as the subsidy cliff — going one dollar over means losing the entire subsidy. Congress temporarily extended credits above 400% FPL through the American Rescue Plan, but that extension may not be permanent. Prudent planning means staying below the traditional 400% FPL threshold.
Below 400% FPL, your subsidy is calculated so your premium never exceeds a sliding-scale percentage of your income. The less you earn (down to 100% FPL), the smaller your required premium contribution. At 100–150% FPL, your Silver plan premium is capped near zero. At 400% FPL, you pay up to 8.5%.
| MAGI (Single) | % of FPL | Max premium as % of income |
|---|---|---|
| < $15,060 | < 100% | May qualify for Medicaid |
| $15,060–$30,120 | 100–200% | 0–6% of income |
| $30,120–$45,180 | 200–300% | 6–9% of income |
| $45,180–$60,240 | 300–400% | 9–8.5% of income |
| > $60,240 | > 400% | Full premium, no subsidy |
2025 FPL for a household of one. For a 2-person household (married), the 400% cliff is approximately $81,760.
ACA MAGI includes most income sources, but critically excludes a few that are especially useful for FIRE retirees. Understanding what counts — and what does not — is the foundation of the entire strategy.
Counts toward MAGI
Does NOT count toward MAGI
The Roth IRA advantage for ACA planning
Because Roth IRA withdrawals are excluded from MAGI, they are the cleanest income source for an early retiree managing the ACA subsidy cliff. A person living on $40K/yr from a Roth IRA pays essentially no income taxes and has MAGI of $0 — maximum subsidy, potentially $0 premiums. This is why building a Roth ladder during the accumulation phase is so strategically important.
The goal is to keep MAGI in the sweet spot — ideally in the 200–350% FPL range — maximizing subsidies while still doing meaningful Roth conversions and tax-advantaged planning. Here is the sequence most FIRE retirees use.
1. Draw from Roth first (or taxable basis)
Roth IRA withdrawals and the return of cost basis from taxable accounts don't add to MAGI. Use these first to cover living expenses. This keeps your MAGI low and your subsidies high.
2. Fill the traditional IRA / 401(k) withdrawal space carefully
Every dollar you pull from a traditional IRA or 401(k) is ordinary income. Model how much you need to keep MAGI below the FPL cliff. Often you can pull some — just not unlimited amounts. A common strategy is to withdraw enough to fill the 0% federal income tax bracket but stay well under the FPL cliff.
3. Do Roth conversions in low-income years, but budget them into your MAGI
Roth conversions are taxable income that count as MAGI. If you convert $30K in a year where you have $15K of other MAGI, your total MAGI is $45K — right near the 300% FPL threshold. Many FIRE retirees deliberately cap their conversions to stay under the cliff. The Roth conversion sweet spot depends heavily on your specific MAGI and your state's subsidy structure.
4. Harvest capital gains at 0% when income permits
If your taxable income is below approximately $48,350 (single, 2025), long-term capital gains are taxed at 0% federal. Even better, realized gains do count as MAGI, so you have to factor them into your cliff calculation. But if you have appreciated taxable assets, low-income early retirement years are the ideal window to harvest gains at no federal tax cost — just stay below the cliff.
5. Use an HSA for medical costs — it's invisible to ACA MAGI
If you funded an HSA during your working years and kept receipts, you can reimburse yourself for old medical expenses at any time. Those reimbursements don't count as MAGI. HSA spending on current medical costs is also MAGI-invisible. Over a long early retirement, a well-funded HSA can cover tens of thousands in medical costs while keeping your MAGI artificially low.
The 400% FPL cliff is one of the sharpest discontinuities in the entire tax code. Going one dollar over means losing the entire subsidy — not just the marginal subsidy on the dollar above the cliff. The math is brutal.
The cliff in numbers (single filer)
On a $800/month Silver plan benchmark (age 55), crossing the cliff costs approximately $9,600/year in lost subsidies for one dollar of extra income. No other income threshold in retirement planning has this kind of marginal tax rate.
Tactics to avoid cliff-crossing: project your income before year-end and compare it against the cliff threshold. If you're close, defer a Roth conversion to next year. Reduce traditional IRA withdrawals. Use QCDs (Qualified Charitable Distributions) from your IRA if you're over 70½ — they satisfy RMDs without adding to MAGI. Also check whether you have any year-end dividend distributions or capital gains distributions from mutual funds scheduled — these count and can surprise you.
Many experienced FIRE retirees deliberately keep MAGI in the 200–300% FPL range. At that level, subsidies are substantial, Roth conversions are still meaningful, and there is a comfortable buffer before the cliff. The 200–300% band is often called the “FIRE sweet spot” for ACA planning.
The chart below shows the approximate annual subsidy at each FPL level for a 50-year-old on a Silver benchmark plan with a ~$700/month full unsubsidized premium. These are illustrative — actual subsidies depend on your specific plan and state.
Annual subsidy value at each income level (single, age 50, Silver plan)
The subsidy value drops sharply near the 400% FPL cliff. Above it, you get nothing.
Project income before December 31
ACA subsidies are based on your projected annual income, not last year's. You can adjust your projection with the marketplace throughout the year. In November or December, estimate what your MAGI will actually land at and compare to the cliff. Pulling less from a traditional IRA or deferring a Roth conversion can save thousands.
Reconcile on your tax return
If your actual income ends up higher than projected, you may owe back some or all of your subsidy at tax time. If it's lower, you get a refundable credit. Keep this in mind when modeling your cash flow — there's a settling-up process in April.
Consider Silver plans specifically for Cost-Sharing Reductions
Cost-Sharing Reductions (CSRs) are additional subsidies that lower your deductible, copays, and out-of-pocket max. They are only available on Silver plans and only at 100–250% FPL. If you can keep your MAGI in this range, a Silver plan can become equivalent to a Gold or Platinum plan in terms of actual coverage generosity.
COBRA as a bridge in the transition year
The year you retire, your income will likely be high (from working the first half of the year). That can push you over the FPL cliff for ACA purposes. Many people use COBRA to extend their employer coverage for that high-income transition year, then switch to the marketplace the following January when their full-year income is lower and subsidies are maximized.
ACA planning is income sequencing, not just insurance shopping
The plan you choose matters less than the MAGI you show up with. Optimizing your account withdrawal order — Roth first, then basis, then carefully metered traditional IRA — is the core of an ACA strategy.
The Roth ladder pays off enormously in early retirement
Every dollar you convert to Roth during accumulation (even if you pay taxes now) is a future dollar that won't count as MAGI in retirement. The tax cost of conversion during accumulation can be far outweighed by the subsidy value of lower MAGI in retirement.
Model this before you retire, not after
The optimal account mix for ACA purposes takes years to build. If your entire retirement portfolio is in a traditional 401(k), every withdrawal is MAGI. You want a blend of Roth, taxable, and traditional accounts to give yourself flexibility. Start building that Roth balance while you're still working.