The HSA Most People Waste
The Triple Tax Advantage
A Health Savings Account is the only account in the tax code that skips tax three separate times. Most people who have one still use it as a specialized checking account for copays. That's not wrong, exactly. It's just leaving most of the account's value on the table.
The account almost nobody uses right
A Health Savings Account skips tax at all three points a dollar normally gets taxed: going in, growing, and coming out. A traditional 401(k) skips tax on the way in and taxes you later. A Roth skips tax on the way out and taxes you now. An HSA skips it at both ends and everywhere in between, provided the money eventually goes toward qualified medical expenses.
And yet, per EBRI’s most recent data, only about 18% of HSA holders invest any part of their balance. The other roughly four out of five leave it sitting entirely in cash, using an account built like the best retirement vehicle in the tax code as a place to park copay money. That gap between what the account can do and how it’s actually used is the entire point of this guide.
Who this fits, and who it doesn’t
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 with no other disqualifying coverage. That’s the real gate. If a high-deductible plan is a poor fit for your family, because of substantial ongoing medical needs, a lower-deductible plan can be the better overall deal even after accounting for the tax break. Run both before assuming this applies to you.
If you are eligible, and your cash flow allows you to cover current medical costs without touching the account, this is one of the most tactically simple upgrades available to a wealth-building plan.
The shoebox strategy, in three steps
- Contribute the maximum your plan allows each year.
- Invest the balance, the same way you’d invest a retirement account, rather than leaving it in cash.
- Pay current medical bills out of pocket when you can, and keep the receipts.
That third step is the part almost nobody does, and it’s where the real value lives. There is no deadline for reimbursing yourself from an HSA. A bill you pay out of pocket this year can be reimbursed, tax-free, decades from now, after that money has spent the entire time compounding untouched inside the account. The receipts are the whole strategy: a shoebox (or a folder, or a phone photo) of paid medical bills is a stack of future tax-free withdrawals waiting to be claimed whenever you actually want the cash.
What it looks like after 65
Two things change once you turn 65. Medical spending becomes easier to match against the account (Medicare premiums, aside from Medigap, now qualify, along with plenty of costs people don’t expect, like dental and hearing aids), and the penalty on non-medical withdrawals disappears entirely. From that point on, money taken out for any reason is simply taxed as ordinary income, meaning the worst case for over-saving into an HSA is that it behaves exactly like a traditional IRA. There’s effectively no downside to maxing it out.
The one piece of housekeeping people skip
Name a beneficiary. HSAs pass very differently depending on who inherits one: a spouse can generally keep it as an HSA, while anyone else typically faces the entire balance as taxable income in a single year. It takes ten minutes to set correctly and is an expensive thing to leave blank.
For the full picture of how an HSA fits against your other accounts, including exactly where it sits in the funding order and how it compares to a 529 plan for families weighing both, those guides pick up from here. For everything the account itself can do, the full HSA guide goes deeper on the mechanics.
Sources
- Employee Benefit Research Institute, Trends in Health Savings Account Balances, Contributions, Distributions, and Investments, 2011-2024. Share of HSA holders investing their balance.
An unused HSA is one of the more common tax leaks we see in an otherwise solid plan. The Wealth Builder Tax Leak Audit checks for this one and eleven others in about five minutes.
Quick answers
- What are the three tax advantages of an HSA?
- Contributions reduce your taxable income going in, the balance grows untaxed while invested, and withdrawals for qualified medical expenses come out with no tax at all. No other account in the tax code skips tax at all three points.
- Do most people actually invest their HSA balance?
- No. According to EBRI research, only about 18% of HSA holders invested any part of their balance in 2024; the rest sat entirely in cash, closer to a specialized checking account than a retirement account.
- What is the "shoebox" receipt strategy?
- Paying current medical bills out of pocket instead of from the HSA, keeping the receipts, and letting the HSA balance stay invested and growing. There is no deadline for reimbursing yourself, so a bill paid this year can be reimbursed tax-free decades later, after the money has compounded the whole time.
- Who is this strategy not a good fit for?
- Anyone who can't comfortably pay current medical costs out of pocket without touching the HSA, or who has substantial ongoing medical needs that make a high-deductible health plan the wrong fit in the first place. Run the numbers on your actual health plan choice before assuming this applies.