Most People Leave Up to $4,660 of HSA Tax Room Unused. Here's the Fastest Way to Check Yours.

An HSA is often described as the single most tax-advantaged account available to most Americans: contributions are deductible, growth is tax-free, and qualified withdrawals are tax-free too. New research from the Employee Benefit Research Institute shows most people aren't getting the full value of any of the three.

The average HSA holder contributes about $760 less than the statutory maximum under individual coverage, and about $4,660 less under family coverage, according to EBRI's ongoing tracking of HSA balances and contributions. On the investing side, the gap is even wider: 65% of holders use their HSA mainly to cover near-term healthcare costs rather than as a long-term savings vehicle, and only 18% invest any portion of their balance in anything other than cash.

Why the gap exists

Most of this isn't a deliberate choice, it's the account being used like the tool it resembles most closely on the surface: a debit card for medical bills. An HSA gets funded through payroll, a card gets issued, and the natural behavior is to spend it down the way you would an FSA, which has a use-it-or-lose-it deadline and no investment option. An HSA has neither restriction: unused balances roll over indefinitely, and once you clear your administrator's cash minimum, typically $1,000 to $2,000, the rest can be invested the same way a 401(k) or IRA balance can.

There's also confusion about who currently qualifies. Eligibility used to mean one thing, enrollment in a traditional high-deductible health plan, but the rules have expanded in recent years to include some ACA Bronze and Catastrophic plans and certain telehealth or direct primary care arrangements. Someone who checked their eligibility years ago and concluded they didn't qualify may not know that's changed.

The two gaps, and how to close each

The contribution gap. Every dollar contributed up to the statutory max is deductible from taxable income, regardless of whether you itemize. If your budget allows for it, closing even part of the $760-$4,660 average shortfall is close to a guaranteed return: it's an immediate reduction in this year's tax bill, on top of tax-free growth later. Anyone 55 or older also gets an additional catch-up contribution on top of the standard max.

The investing gap. Cash sitting in an HSA above your near-term medical needs is money that isn't compounding. We cover the mechanics of that specific gap, including how little most administrators actually pay on the cash portion, in our guide on why the cash in your HSA is probably earning nothing. The short version: invest the balance above your administrator's cash threshold, and the full triple tax advantage stays intact.

Check your own numbers

The fastest way to see where you actually stand, this year's contribution room, whether your specific plan still qualifies, and what the age 55+ catch-up adds, is to run your situation through our HSA eligibility checker. It walks through current 2026 limits and coverage rules, including the newer ACA Bronze/Catastrophic and telehealth eligibility paths, in about a minute.

For the bigger-picture case on why an underused HSA is really a retirement account in disguise, see the HSA as a stealth retirement account.

Methodology

Contribution and investing-behavior figures are drawn from EBRI's ongoing HSA research, which has tracked account balances, contributions, and investment activity for more than a decade. Eligibility and contribution-limit figures reflect current 2026 IRS rules. This is educational information, not personalized tax or financial advice.

Sources

• EBRI: HSA Research Database