Most FIRE budgets are built around a snapshot of current spending, and healthcare is where that snapshot is most likely to mislead. While you're employed, a large share of your premium is typically paid by your employer, so the number you see on your paycheck is not what healthcare actually costs — it's a heavily subsidized fraction of it. The moment you leave a job for early retirement, that subsidy disappears, and you're responsible for the full premium on an individual or family plan, often years or decades before you become eligible for public retiree health coverage. Treating your current out-of-pocket healthcare line item as a stand-in for your post-retirement cost is one of the more common and consequential errors in FIRE planning.

To see why this matters in concrete terms, consider a simplified illustrative scenario. Someone retiring at 45 who needs individual market coverage until a public program becomes available at 65 faces a 20-year bridge period. If unsubsidized family premiums run, for illustration, around 15,000 in your local currency per year and grow faster than general inflation, the cumulative bridge-period cost before any deductibles or out-of-pocket spending can easily exceed 400,000 in today's terms once you account for years of premium growth compounding on top of each other. That is a large enough figure to meaningfully shift a FIRE number on its own, yet it's frequently left out of early drafts of a retirement budget because the person planning is still on an employer plan and has never priced an individual policy directly.

The reason healthcare deserves special treatment in a withdrawal plan, rather than being lumped into general living expenses, is that medical costs have historically grown faster than broad consumer inflation in many countries, driven by rising costs of medical labor, new treatments and technology, and an aging population's growing demand for care. A withdrawal plan that assumes healthcare grows at the same rate as your overall spending assumption will systematically understate this one category over a 30-to-50-year retirement horizon, which is exactly the kind of quiet, compounding error that erodes a plan's safety margin without showing up until years later.

A frequent mistake, especially among people retiring in their 40s, is pricing healthcare using their current employer-subsidized premium rather than requesting an actual individual-market quote, and separately, ignoring the annual out-of-pocket maximum a plan can require on top of the premium itself. Another common gap is forgetting categories that many standard health plans exclude or limit, such as dental, vision, or certain prescription tiers, which can add a meaningful recurring cost that a retiree ends up paying from cash flow rather than from the plan they budgeted for. People who have access to a tax-advantaged medical savings vehicle through their employer, where such accounts exist, often also under-fund it during their working years, missing an opportunity to build a dedicated, tax-favored healthcare bucket before that access disappears at retirement.

A more resilient approach treats healthcare as its own line item with its own bridge-period sizing, similar to how a cash buffer or a bond tent is sized separately from the general portfolio. That means getting an actual quote for individual coverage before finalizing a FIRE number rather than guessing, assuming premium growth at a rate above your general spending inflation assumption, and building in a margin for at least one significant medical event during the bridge years rather than assuming only routine costs. In countries with universal or national health coverage, the bridge-period gap described above may be much smaller or nonexistent, but it's still worth confirming exactly what is and isn't covered, whether coverage is tied to employment or residency, and whether any means-tested premiums could rise once employment income stops — rules vary widely and change over time, so this is worth confirming against current official sources rather than assumptions carried over from someone else's plan.

Before finalizing the healthcare portion of an early retirement plan, it helps to work through a short checklist. Get an actual individual or family premium quote rather than relying on your current subsidized employer cost, size a dedicated bridge fund that covers the years between leaving work and becoming eligible for public retiree coverage, assume premium growth above your general inflation assumption rather than equal to it, budget separately for out-of-pocket maximums and commonly excluded categories like dental and vision, and build a buffer for at least one unplanned medical event rather than only routine annual costs. None of this is medical, tax, or insurance advice — coverage rules, subsidy programs, and public eligibility ages vary by country and change over time, so confirm current details with an official source or a licensed advisor before locking in your numbers.

Managing Healthcare Costs in Early Retirement