The HSA Is the Best Retirement Account You Own. Here Is How to Use It

Key takeaways

2026 limits are $4,400 for self-only and $8,750 for family coverage, plus $1,000 for each spouse 55 or older; contributions are deductible, growth is untaxed, and withdrawals for medical expenses are tax-free.
Paying current medical costs from cash and leaving the HSA invested turns it into a retirement account that can be reimbursed years later for those saved receipts.
After 65, withdrawals for any purpose are penalty-free and taxed like a traditional IRA, so there's no downside to overfunding.
Contributions must stop six months before Medicare enrollment, and the account can't receive employer or payroll contributions after that.

There's one account in the tax code that's deductible on the way in, grows without tax, and comes out without tax. It isn't the 401(k) or the Roth IRA; each of those gets taxed at one end. It's the health savings account, and most people who have one use it as a debit card for copays. Used deliberately, it's the most tax-efficient retirement account available. You just have to know the rules.

The three tax advantages

Contributions to an HSA are deductible (or excluded from income if made through payroll, which also skips FICA tax). Interest, dividends, and gains inside the account aren't taxed. Withdrawals used for qualified medical expenses aren't taxed either, at any age.

No other account has all three. A traditional IRA is deductible in and taxed out. A Roth is taxed in and free out. The HSA, for medical spending, is free at both ends. And since virtually everyone has substantial medical expenses in retirement (Medicare premiums, dental, vision, hearing, long-term care premiums, out-of-pocket costs), the "medical only" restriction is far less limiting than it sounds.

Who can contribute, and how much

You must be covered by a high-deductible health plan (in 2026, a deductible of at least $1,700 self-only or $3,400 family, with out-of-pocket limits of $8,500 and $17,000), and have no other disqualifying coverage, including Medicare, a general-purpose FSA, or a spouse's non-HDHP plan that covers you.

The 2026 contribution limits are $4,400 for self-only coverage and $8,750 for family coverage. Each spouse aged 55 or older can contribute an additional $1,000 catch-up, but only into their own HSA, so a couple both over 55 needs two accounts to capture both. Employer contributions count toward the limit. Contributions for a year can be made until the tax filing deadline the following April. And since 2026, bronze and catastrophic plans purchased on the ACA marketplace also qualify as HDHPs for HSA purposes.

The strategy: pay cash now, reimburse later

The default use of an HSA is to spend it on current medical costs. The better use, for anyone who can afford it, is to pay current costs from ordinary cash, leave the HSA fully invested in a diversified stock portfolio, and keep the receipts.

There's no deadline for reimbursing yourself for a qualified expense, as long as the expense was incurred after the HSA was established. A $3,000 dental bill paid in cash in 2026 can be reimbursed from the HSA in 2046, tax-free, after twenty years of growth. Every receipt you save is a future tax-free withdrawal of any size, at any time, for any reason, because the reimbursement isn't tied to what you spend the money on then.

Over a career, a couple contributing the family maximum and investing it can build up several hundred thousand dollars in an HSA, with a folder of receipts that makes a large portion of it accessible tax-free on demand and the rest available for the medical costs of retirement. Yes, you have to keep the receipts. A scanned folder is fine.

After 65

At 65, two things change. Withdrawals for non-medical purposes are no longer subject to the 20% penalty; they're simply taxed as ordinary income, exactly like a traditional IRA withdrawal. So an overfunded HSA is never a mistake. At worst it becomes an IRA. And Medicare premiums (Parts B, D, and Medicare Advantage, though not Medigap) become qualified expenses the HSA can pay tax-free, which for most retirees is several thousand dollars a year for the rest of their lives.

Contributions must stop once you enroll in Medicare, and because Part A enrollment is retroactive up to six months, contributions should stop six months before the planned enrollment date. Someone working past 65 who delays Medicare and stays on an employer HDHP can keep contributing.

Where it fits in the order of savings

Our general order for a household with a qualifying health plan: contribute enough to the 401(k) to capture the full match, then max the HSA, then go back to the 401(k) and the backdoor Roth IRA. The HSA goes ahead of additional 401(k) deferrals because its tax treatment is strictly better for the medical spending that will certainly exist, and because payroll contributions also avoid the 7.65% FICA tax that 401(k) deferrals don't.

Investing it

Most HSA custodians hold contributions in cash by default and make you elect to invest. Move the balance above a small cash cushion into low-cost index funds, and treat it as the longest-horizon money you have, because it is. This is the account you touch last. Some employer HSAs have poor investment options or high fees; you can transfer balances to a better custodian while keeping the employer account open for payroll contributions.

At death

An HSA left to a spouse becomes the spouse's HSA with all the same benefits. Left to anyone else, it's fully taxable to the beneficiary in the year of death, with no ten-year window. Which makes the HSA the account to spend down in late life, after the receipts are reimbursed and the Medicare premiums paid, rather than the one to leave to children. It belongs in the beneficiary designation review with everything else.

Mistakes we see

Spending the HSA on current expenses when cash is available. Leaving it in cash for years. Contributing after Medicare enrollment, which triggers excise taxes. Holding a general-purpose FSA at the same time. Not keeping receipts. Naming no beneficiary. Forgetting that both spouses over 55 need separate accounts for both catch-ups. We see every one of these regularly, and each is a line item in the tax planning checklist for clients with high-deductible plans.

Frequently asked questions

Can I use my HSA for my spouse's or children's expenses?

Yes, for any tax dependent's qualified medical expenses, even if they aren't covered by your HDHP.

Is an HDHP right for me just to get the HSA?

Not always. Someone with high, predictable medical costs may pay more under an HDHP than under a low-deductible plan, and the HSA benefit won't close the gap. Compare total expected cost, premiums included, before choosing a plan for the account.

Can I roll an IRA into an HSA?

Once in a lifetime, up to the annual contribution limit, and it counts as that year's contribution. It's rarely better than simply contributing cash and leaving the IRA alone.

Does Florida tax HSAs?

Florida has no income tax. A few states (California and New Jersey) don't recognize HSA deductions; Florida residents have no state layer to think about.

Joseph G. Valerio, CFP®, EAFounder and Lead Advisor at Valerio Wealth Management, a fee-only, fiduciary virtual family office in Miami, Florida. One advisor, credentialed in both financial planning and federal tax. About Joseph

This article is general education, not individualized advice, and it is not tax, legal, or accounting advice. Figures reflect federal law for the year stated and can change. Valerio Wealth Management does not prepare or file tax returns. Speak with a qualified professional about your own situation before acting.