HSA Investment Calculator

Last updated July 2, 2026

Health Savings Accounts offer the only triple tax advantage in the U.S. tax code: contributions are pre-tax (or tax-deductible), growth inside the account is tax-free, and withdrawals for qualified medical expenses are tax-free. In 2026, the HSA contribution limit is $4,400 for individual coverage and $8,750 for family coverage. To be eligible, enrollment must be in a qualifying high-deductible health plan and not enrolled in Medicare or another non-HDHP health plan. Unlike Flexible Spending Accounts, HSA balances carry over indefinitely — there's no use-it-or-lose-it provision — and the account belongs to the individual, traveling with them across jobs and plans.

The investment angle is where HSAs become particularly powerful for those who can afford to pay current medical expenses out of pocket. Most HSA administrators allow account holders to invest balances above a minimum threshold — typically $500 to $1,000 — in mutual funds or ETFs. An HSA funded with $8,750 annually for a family, invested in a diversified stock fund over 20 years at 7 percent, grows to approximately $359,000 — all of which can be withdrawn tax-free for qualified medical expenses in retirement, where healthcare costs represent the largest and most unpredictable expense category. After age 65, non-medical withdrawals are taxed as ordinary income, making the HSA function like a traditional IRA as a floor, with the additional benefit of tax-free medical withdrawals on top.

For people in a qualifying high-deductible health plan, fully funding the HSA each year and investing the balance rather than holding it in cash can materially increase the account's long-term value. The triple tax advantage makes the HSA the most tax-efficient savings vehicle in the U.S. tax code — more efficient per dollar than either a 401(k) or a Roth IRA. The invested HSA balance at retirement can be modeled alongside other accounts as a healthcare reserve.