Healthcare Gap Calculator
Estimate the hidden cost of health insurance between early retirement and Medicare eligibility at 65. All calculations happen locally — nothing leaves your browser.
What is the healthcare gap in early retirement? The healthcare gap is the stretch between the day you leave employer health coverage and the day Medicare eligibility begins at age 65, during which you buy and pay for insurance yourself. Retiring at 55 leaves a ten-year gap; retiring at 50 leaves fifteen. The cost is the annual premium plus the deductible plus expected out-of-pocket spending, compounded each year by medical inflation, which has generally run ahead of general consumer inflation.
How to Use the Healthcare Gap Calculator
- Set your early retirement age — This is the only input that changes the length of the gap — the tool counts the years from that age up to 65 and refuses ages of 65 or above, since Medicare eligibility ends the gap. Your current age is stored for the other FIRE calculators but does not affect this total.
- Enter a monthly premium you have actually priced — Do not guess from your current payslip deduction, which is the employee share of a much larger premium. Look up a real plan for your age, ZIP code and household on the marketplace you would buy from, and use the full monthly figure before any subsidy.
- Add the annual deductible — The model assumes you meet the deductible every year. That is a deliberately conservative choice: it produces a planning number that holds in a bad year rather than an average one. Halve it if you want a lighter scenario.
- Estimate out-of-pocket spending — This is everything above the deductible you expect to pay in a year — copays, coinsurance, prescriptions, dental and vision if the plan excludes them. It is added on top of the deductible, not merged with it.
- Choose a medical inflation rate — The default is 6%. Health costs have historically risen faster than general inflation, so a rate at or above your general inflation assumption is the realistic setting. Try 4% and 8% to see how wide the range gets over a long gap.
- Read the total and the year-by-year table — The headline is the sum of every year in the gap. The table beneath splits each year into premium, deductible and out-of-pocket so you can see how much of the growth comes from the premium line alone.
How the Gap Cost Is Calculated
The model is deliberately transparent. It builds one row per year of the gap, starting at your retirement age and stopping the year before 65, and each row is the same three components grown by compound medical inflation:
Year y cost = (monthly premium × 12 + deductible + out-of-pocket) × (1 + medical inflation)^yYear zero — your first year of retirement — has an exponent of zero, so it is simply the three figures added together with no growth applied. That is what the First Year Cost card shows. Every later year multiplies the same base by another year of inflation, and the Total Healthcare Gap Cost is the sum of every row:
Total = Σ (base cost × (1 + i)^y) for y = 0 … (65 − retirement age − 1)Average Annual Cost is that total divided by the number of gap years, and Average Monthly Cost is the average annual figure divided by twelve. Because inflation compounds, the average sits above the first year and below the last — do not read the monthly average as what you will pay in month one, because on a long gap the final year can cost nearly twice the first.
What the model does not do
Knowing the boundaries matters more here than in most calculators, because the omissions all point the same way.
- No subsidies. Income-based premium assistance on the public marketplace is not modelled at all. For a household with modest realised income this is the single largest omission, and it can move the answer by a wide margin in your favour.
- No discounting. The total adds up future dollars at face value rather than converting them back to today's purchasing power. As a planning target that is the right number to fund, but it is not comparable to a figure quoted in today's money.
- No tax treatment. Premiums paid with pre-tax dollars, the self-employed health insurance deduction and HSA-funded spending all change the real cost, and none of them appear here.
- One flat scenario. A single premium and a single inflation rate run for the whole gap. Real premiums step up with age band, plans change every year, and a single bad health year can dwarf the model.
- The deductible is assumed spent in full, every year. Many years you will not touch it. This is a conservative planning number, not an expected value.
This calculator produces an informational estimate for planning, not financial, insurance or medical advice, and it does not reflect any specific plan, subsidy programme or eligibility rule. Verify premiums and eligibility with the marketplace or insurer you would actually buy from, and speak to a licensed insurance broker or a qualified financial professional before making a retirement decision that depends on these numbers.
How Long the Gap Is
Medicare eligibility begins at 65 for most people in the United States, so the gap length is fixed arithmetic once you pick a retirement date. What is easy to miss is how non-linear the cost is: every year earlier you retire adds a year of premiums and pushes all the later years further up the inflation curve.
| Retire at | Gap length | Total cost as a multiple of the first year, at 6% medical inflation |
|---|---|---|
| 62 | 3 years | About 3.2× one year's cost |
| 60 | 5 years | About 5.6× one year's cost |
| 57 | 8 years | About 9.9× one year's cost |
| 55 | 10 years | About 13.2× one year's cost |
| 50 | 15 years | About 23.3× one year's cost |
| 45 | 20 years | About 36.8× one year's cost |
The multipliers come straight from the compound sum in the formula above, so they hold whatever your first-year cost happens to be. A twenty-year gap does not cost twice a ten-year gap; at 6% it costs closer to three times as much, because the extra decade is the expensive end of the curve. That asymmetry is the strongest financial argument for treating a retirement date and a healthcare plan as one decision rather than two.
Ways to Cover the Gap
The number this tool produces is the cost of the default route: buying an individual plan for the whole stretch. There are usually cheaper routes for part of it, and most early retirees end up combining several.
| Option | How long it lasts | What to watch |
|---|---|---|
| COBRA continuation | Generally 18 months after leaving a job, longer for certain qualifying events | You pay the full premium plus an administrative charge, so the cost jumps sharply even though the plan is unchanged |
| Individual marketplace plan | The rest of the gap | Premium assistance depends on household income for the year, which you have unusual control over once you stop earning a salary |
| A spouse's employer plan | As long as they keep working | Often the cheapest option available; adding a dependent still costs the employee share |
| Part-time work with benefits | As long as you keep the hours | The basis of the Barista FIRE approach — the job is bought for the insurance, not the wage |
| Retiree medical from a former employer | Varies, increasingly rare | Check whether it is guaranteed or can be withdrawn, and whether it bridges to 65 |
Why realised income matters more after you stop working
On the individual market, help with premiums is assessed against household income for the coverage year rather than against wealth. An early retiree with a large portfolio may have very little income on paper, because how much appears is largely a matter of which accounts you draw from and how much gain you realise. Selling appreciated shares, converting to a Roth, or taking a large distribution all raise that figure; drawing from cash savings or basis generally does not.
That makes the withdrawal sequence and the healthcare decision the same decision, which is not obvious until you are in it. Planning a large Roth conversion in a year you also need subsidised coverage can cost more in lost assistance than the conversion saves in future tax. Rules and thresholds change from year to year, so confirm the current position with the marketplace or a tax professional rather than working from a figure you read once — but build the interaction into the plan, because the two levers pull against each other.
One more habit is worth building early: while you are still employed and eligible, a health savings account is the only vehicle that is untaxed going in, growing, and coming out for qualified medical spending. Contributions stop once you enrol in Medicare, but the balance does not disappear, and it is the most tax-efficient pool to spend during the gap. Treat the total this calculator produces as the sum you want that account, plus a dedicated slice of the portfolio, to be capable of covering.
Frequently Asked Questions
It is the period between leaving employer-sponsored health coverage and becoming eligible for Medicare at 65, during which you buy insurance yourself and pay the full cost. Retiring at 55 creates a ten-year gap. It is one of the most commonly underestimated items in an early retirement plan because the premium you saw on your payslip was only the employee share of a much larger figure.
It is a planning estimate, not a quote. The arithmetic is exact for the assumptions you enter, but those assumptions do a lot of work: one premium, one inflation rate, and the deductible assumed spent in full every year. It does not model income-based premium assistance, taxes, plan changes, or the fact that premiums typically rise with each age band. Treat the result as an upper-ish bound and re-run it against a real quote each year.
Eligibility for premium assistance depends on household income for the coverage year, the plan you choose, where you live and household size, and the rules are revised periodically. Building any of that into a static calculator would produce a confident number that is wrong for most people. Price a plan on the marketplace with your expected income, then put the net premium into this tool if you want a subsidised scenario.
No. Every calculation runs in JavaScript in your browser and no data is transmitted to a server. Two local behaviours are worth knowing: your inputs are written into the page URL so a scenario can be bookmarked, and your current age is saved to your browser's local storage so the other FIRE calculators on this site can pre-fill it. Clear the URL before sharing a link if you would rather not pass those figures on.
Health costs have generally risen faster than the broad consumer price index, which is why this tool separates the two rates instead of using one. The 6% default sits in the range commonly used for planning. Rather than hunting for the single correct figure, run 4%, 6% and 8% and look at the spread — on a fifteen-year gap the difference between those runs is usually larger than any refinement you could make to the premium.
COBRA keeps the plan and the network you already have, and it is often the right choice if you are mid-treatment or have met your deductible for the year — but you pay the entire premium plus an administrative charge, so it usually costs far more than the payroll deduction it replaces. Federal COBRA generally runs 18 months, which rarely covers a full gap. Price both, and remember an individual plan may be cheaper if your realised income is low.
Because the gap depends only on when you stop working and when Medicare begins. The current age field is there so the FIRE calculators on this site share one profile and pre-fill each other; it is saved locally and used elsewhere. Change the early retirement age to change the length of the gap.
Yes, and it adds the estimated out-of-pocket figure on top rather than treating the deductible as part of it. That is intentionally cautious: it answers what a consistently expensive decade would cost rather than an average one. If you want an expected-value figure instead, enter a fraction of the deductible that reflects how often you actually meet it.
Use Cases
Sizing the Insurance Sleeve of a FIRE Number
Someone targeting retirement at 52 runs the gap cost and adds the total to their target portfolio as a separate line, rather than hoping the 4% withdrawal covers a bill that ends abruptly at 65.
Pricing One More Year of Work
Compare retiring at 55 against 56. The difference is not one year of premiums — it is one year removed from the most expensive end of the curve, and seeing that figure often reframes the decision.
Deciding Whether a Part-Time Job Pays
Divide the average annual cost by the hours of a benefits-eligible part-time role. If the insurance alone is worth more than the wage, that changes which jobs are worth taking during the gap.
Setting an HSA Target While Still Employed
Work backwards from the total to a contribution rate for the years you are still eligible, so the account arrives at retirement carrying a meaningful share of the gap rather than a token balance.
Planning Around a Spouse's Employment
Model the gap twice: once assuming a partner keeps working and carries family coverage to a given year, and once without. The difference is the real cost of both people stopping at the same time.
Stress-Testing a Bad Health Decade
Set the deductible and out-of-pocket to the plan maximums and the inflation rate to 8%. If the plan still holds under that run, the healthcare assumption is not the thing that will break it.