See how big your Health Savings Account could grow if you invest it and leave it alone until 65. Enter your age, balance, yearly contribution, and expected return for a tax-free projection.
Sample input: Your current age: 35, Current HSA balance ($): 5000, Annual contribution ($): 4400, Expected annual return (%): 7
HSA value at 65: 453689 (Building a solid HSA nest egg)
Investing your HSA could grow it to about $453,689 by age 65 (30 years of tax-free compounding), all available tax-free for qualified medical costs. The number assumes you invest the balance rather than spend it.
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It uses the standard future-value formula: your current balance grows at your expected return, plus an annuity of your yearly contributions compounding to age 65. All growth is tax-free inside an HSA per IRS Publication 969.
For qualified medical expenses, yes — HSA withdrawals are tax-free at any age (IRS Publication 969). After 65 you can also withdraw for any reason and pay only ordinary income tax with no penalty, like a Traditional IRA.
A common long-run assumption for a diversified stock-heavy portfolio is around 6 to 7 percent before inflation. Use a lower number for a conservative estimate; the projection is only as good as the return you actually earn.
For 2026 the IRS limit is $4,400 self-only or $8,750 family, plus a $1,000 catch-up at age 55 or older. Investing the maximum each year is what turns an HSA into a six-figure account.