Health insurance is the most common reason people believe they cannot retire before 65. The premium tax credit that offsets marketplace coverage is based on the income you report, not on the assets you hold — which means a household with substantial savings can still qualify if it plans deliberately which dollars to realize each year.
Ask someone in their late fifties why they are still working and health insurance comes up more often than money does. They have the savings. What they do not have is a plan for covering a family until Medicare starts at 65, and the sticker price of an unsubsidized marketplace plan is genuinely alarming.
The piece most people miss is that the marketplace premium tax credit is calculated from income, not from net worth. Two households with identical portfolios can pay very different premiums depending entirely on which accounts they drew from that year. That distinction is what turns early retirement from a wish into an arithmetic problem — and arithmetic problems have solutions.
Why the credit is based on income rather than assets
Eligibility for the premium tax credit is driven by modified adjusted gross income relative to the federal poverty guideline for your household size. It does not look at the balance of your brokerage account, your IRA, or your home equity. It looks at what you realized as income during the year.
For a working household those two things move together, so the distinction never comes up. For a retired household they come apart completely. You decide how much income to realize — by choosing whether this year's spending comes from cash, from a taxable account with a modest gain, from a tax-deferred IRA, or from a Roth. Each of those choices lands differently on the same line of the same tax return.
The threshold, and why it matters so much
The rules around the upper income limit have changed more than once, most recently in 2025, and they are worth confirming for the year you are actually planning. What has not changed is the shape of the problem: there is a threshold, credits phase out around it, and crossing it by a small amount can cost far more than the income that crossed it was worth.
That is why this belongs in a plan rather than in a spreadsheet you revisit each December. A large Roth conversion, a capital gain taken without checking, or a distribution you did not need can each push a household over a line it did not know it was near.
Which levers actually control the number
Spending from cash savings produces very little reportable income, which makes a cash reserve unusually valuable in the pre-65 years specifically. Selling appreciated positions in a taxable account produces income only on the gain, not the whole withdrawal. Roth distributions of already-taxed money generally do not add to the figure at all.
Conversely, tax-deferred IRA and 401(k) withdrawals count in full, and Social Security taken early adds to the calculation as well. That is one of several reasons why delaying a claim can be worth more than the benefit increase alone — it also keeps the pre-65 income picture clean while credits are in play.
None of these levers is free. Spending cash means not investing it; deliberately suppressing income in your sixties can mean larger required distributions in your seventies. The point is not to minimize income for its own sake but to decide, on purpose, which years take the tax hit.
What this buys you
For households where the healthcare number was the only thing standing between them and stopping work, planning this well can be the difference between retiring at 62 and retiring at 65 or later. Those are years you cannot buy back, and they are typically the healthiest years of retirement.
It also has to be planned against everything else. The same low-income years that maximize a premium credit are the years Roth conversions are cheapest, and those two goals pull in opposite directions. Which one wins depends on the size of the tax-deferred balance, how long the gap to Medicare is, and what the household's later brackets are likely to look like.
This is the clearest example we know of why tax planning, investment strategy, and retirement income planning cannot be three separate conversations with three separate people. The insurance decision, the withdrawal decision, and the conversion decision are all the same decision viewed from different sides. If you are within a few years of 65 and assuming health insurance rules out an early exit, it is worth running the actual numbers before you accept that conclusion.