The HSA

Three advantages in one account

Every other account gives you a tax break on one end or the other. A traditional 401(k) gets you a deduction now and taxes you later. A Roth taxes you now and never again. A Health Savings Account does something no other account does: it skips the tax at all three points:

• Going in, contributions reduce your taxable income (and through payroll, typically avoid Social Security and Medicare tax too).
• While it grows, no tax on interest, dividends, or gains.
• Coming out, no tax at all, provided the money goes toward qualified medical expenses.

That third one is the trick. Money that is never taxed on the way in, never taxed while growing, and never taxed on the way out is unique in personal finance.

Who can use one

An HSA is tied to your health insurance, not your employer. You’re eligible in any month you’re covered by a qualifying high-deductible health plan and have no other disqualifying coverage, and once you enroll in Medicare, you can no longer contribute (though you can still spend what you’ve built). Contribution limits are set annually, with a higher limit for family coverage and an extra catch-up amount once you’re in your mid-fifties, so check the current year’s figures before you set your payroll deduction.

One point that surprises people: the account is yours, permanently. Unlike an FSA, nothing expires at year-end. Change jobs, change plans, retire: the balance follows you, forever.

The move almost nobody makes

Here’s where most HSAs go wrong. The money sits in the cash portion of the account, gets spent on this year’s copays, and never grows. That’s a perfectly reasonable use, and it wastes the account’s best feature.

The alternative: contribute the maximum, invest the balance the way you’d invest a retirement account, and, if your cash flow allows, pay current medical bills out of pocket instead of raiding the HSA. Then keep the receipts. There’s no deadline for reimbursing yourself; a bill you paid this year can be reimbursed tax-free from the account decades from now, after the money has spent all those years compounding untouched.

For illustration: contributing a family-level amount annually and investing it for twenty-five years can plausibly build a six-figure balance, all of it available tax-free for healthcare, which happens to be one of the largest expenses most retirees face. Meanwhile, that same money in a taxable account would have been taxed on its dividends and gains the entire way.

What it means after 65

Two things change once you reach 65. First, medical spending gets easier to match against the account: Medicare premiums (aside from Medigap) qualify, as do long-term care insurance premiums within limits and plenty of costs people don’t anticipate, such as dental, vision, and hearing aids.

Second, the penalty for non-medical withdrawals disappears. From 65 on, money taken out for any reason is simply taxed as ordinary income, which means a worst case where your HSA behaves exactly like a traditional IRA. That’s the safety net worth knowing about: if you dramatically over-save into an HSA, the downside isn’t a lost account, it’s an ordinary retirement account.

The honest limits

An HSA isn’t automatically right for everyone. It requires a high-deductible plan, and if your family has substantial ongoing medical needs, a lower-deductible plan can be the better overall deal even after accounting for the tax break. Run both, don’t assume. It also only works if you can genuinely afford to leave the money invested; raiding it every year for routine costs is fine, it just isn’t the strategy above.

And one piece of housekeeping worth ten minutes: name a beneficiary. HSAs pass very differently depending on who inherits them: a spouse can generally keep it as an HSA, while others typically face the full balance as taxable income in one year. It’s an easy thing to set correctly and an expensive thing to leave blank.