Guide to HSAs

HSA, in plain English

A Health Savings Account (HSA) is a tax-advantaged account that pairs with a high-deductible health plan (HDHP). It exists to help you pay for medical expenses with pre-tax dollars — but the way the IRS wrote the rules, it’s also the most powerful retirement account in the tax code.

If you’re young, healthy, and on an HDHP, the HSA is probably the single most valuable benefit you have access to. Most people never figure that out.

The triple tax advantage

Every other tax-advantaged account gives you two of these. The HSA gives you all three:

1. Contributions are pre-tax. The money goes in before income tax is taken out. You lower this year’s tax bill. If you contribute through payroll deduction, the money also skips FICA (an extra 7.65% saving you don’t get from a contribution made directly to the HSA outside payroll).
2. Growth is tax-free. Investments inside the HSA grow without being taxed each year.
3. Withdrawals for qualified medical expenses are tax-free. No tax, ever, on those dollars.

A Traditional 401(k) gives you #1 and #2: withdrawals are taxed. A Roth IRA gives you #2 and #3: contributions aren’t deductible. The HSA gives you all three.

Who qualifies

To contribute to an HSA, you need to be enrolled in a high-deductible health plan (HDHP) and have no other disqualifying coverage. The IRS sets minimum deductibles and maximum out-of-pocket limits each year for what counts as an HDHP.

You also can’t be:

• Enrolled in Medicare
• Claimed as a dependent on someone else’s tax return
• Covered by another non-HDHP health plan (including a spouse’s PPO, the more typical lower-deductible plan, in many cases)
• Enrolled in a general-purpose Flexible Spending Account (FSA — a use-it-or-lose-it pre-tax medical account)

If you’re under 26 and on a parent’s PPO, you don’t qualify. If you graduate, take a job, and pick the HDHP option — you do.

2026 contribution limits

The limit is combined — your contributions plus any employer contribution count toward the same cap. If your employer puts in $1,000, you can contribute up to $3,400 on self-only coverage in 2026. To find out exactly what your employer contributed last year, look at your W-2 Box 12 with code W, which includes both employer and your payroll contributions.

HDHP vs PPO — the actual decision

For a young, healthy person who rarely sees a doctor, an HDHP usually wins, and the HSA is what makes the math work. The HDHP has a lower monthly premium; the savings go straight into the HSA; the HSA dollars cover the higher deductible if you need them, and grow tax-free if you don’t.

The HDHP loses when:

• You see specialists frequently or have ongoing prescriptions.
• You expect a major procedure or pregnancy in the plan year.
• You have a chronic condition that means you’ll hit the out-of-pocket max either way.
• The premium difference between the HDHP and PPO is small, eroding the savings.

The “stealth retirement account” play

Here’s the move that turns the HSA from a medical-bill account into a retirement powerhouse:

1. Contribute the maximum each year.
2. Pay current medical expenses out of pocket (from your regular savings) — not from the HSA.
3. Invest the HSA balance above the cash threshold. Funding an HSA is not the same as investing it — contributions sit as cash by default. Inside your HSA provider’s portal, look for an “Invest” or “Investment Elections” tab and move dollars above the cash floor (often $1,000–$2,000) into low-cost index funds, just like a 401(k). Without this step the whole stealth-retirement play silently fails.
4. Save every medical receipt. There’s no time limit on reimbursing yourself from an HSA — a $300 ER visit in 2026 can be reimbursed tax-free in 2056 if you saved the receipt, and that $300 has been compounding tax-free in the HSA the whole time. Keep the provider’s itemized bill plus the insurance explanation of benefits (EOB) when you have one; for out-of-pocket items, the credit-card receipt or pharmacy printout works. The IRS wants enough detail to confirm the expense was medical and to show what your insurance didn’t reimburse.
5. At age 65, you can withdraw HSA funds for any reason, paying only ordinary income tax (like a Traditional IRA). Before 65, a non-medical withdrawal is treated harshly: ordinary income tax plus a 20% penalty, so keep money you might need soon outside the HSA. For qualified medical expenses, withdrawals remain tax-free at any age.

Played this way, the HSA becomes a retirement account with better tax treatment than a 401(k) or Roth IRA — but still gives you a tax-free escape hatch for medical bills any time you need it.

What counts as a qualified medical expense

The IRS defines this broadly. Common qualified expenses include:

• Doctor visits, hospital fees, surgeries, diagnostic tests
• Prescription medications (and, since 2020, over-the-counter drugs without a prescription)
• Dental — cleanings, fillings, braces
• Vision — exams, glasses, contacts, LASIK
• Mental health — therapy, psychiatric visits
• Physical therapy, chiropractic care
• Medical equipment — crutches, blood pressure monitors, glucose monitors
• Long-term care insurance premiums (the IRS sets an age-banded annual cap — see Pub. 502)
• Most Medicare premiums (Parts B, D, and Medicare Advantage), but not Medigap supplemental premiums

Not covered: gym memberships (in most cases), cosmetic procedures, vitamins, and most insurance premiums. For the full list, see IRS Publication 502.

Where to open one

Picking an HDHP during open enrollment doesn’t automatically open an HSA — they’re two separate elections. After enrolling in the HDHP, you still need to actively open and fund the HSA (often through a second checkbox on the same benefits page, or through a payroll-deduction form).

Many employers offer an HSA through a payroll provider, which is usually the easiest path — and (per the triple-tax-advantage section above) payroll contributions also skip the 7.65% FICA cut you’d otherwise pay on a personal HSA contribution.

Outside of payroll, popular self-directed HSA providers include Fidelity, Lively, and HealthEquity. Look for:

• No monthly maintenance fee (or one that’s waived above a low balance)
• Investment options with low expense ratios — index funds in the 0.03%–0.10% range
• Low minimum to start investing — ideally no minimum, so every dollar is invested

You can move funds between HSAs without tax consequence using a trustee-to-trustee transfer (the two providers move the money between themselves; you never touch it, so it’s never a taxable distribution). If your employer’s HSA is mediocre, fund it for the FICA break and periodically transfer funds to a better provider.

Common mistakes

• Treating the HSA like an FSA. FSAs are use-it-or-lose-it. HSAs roll over forever and follow you when you change jobs. Don’t drain it every year.
• Leaving it all in cash. A cash-only HSA at 0.5% interest is a slow leak versus an invested HSA at 7%–8% return after inflation over decades.
• Not contributing because you don’t expect medical bills. That’s exactly the case where the HSA wins biggest — the dollars compound tax-free for retirement.
• Forgetting about it after a job change. Your HSA stays yours even if you switch off the HDHP. Old job’s HSA balance keeps growing; you just can’t add to it once you’re off the HDHP.
• Spending it on medical bills you could have paid out-of-pocket. Every dollar you spend from the HSA is a dollar that didn’t compound tax-free. If you can afford the bill from regular savings, save the HSA dollars and the receipt.

Where this fits in the order of operations

In our Money Order of Operations, the HSA shows up at Step 5 — alongside the Roth IRA, after high-interest debt is dead and your emergency fund covers 3–6 months of essential expenses. It comes before maxing your 401(k) past the match because the tax treatment is unbeatable.

Key takeaways

• The HSA is the only triple-tax-advantaged account: pre-tax in, tax-free growth, tax-free out (for qualified medical).
• You need to be on an HDHP to contribute, with no disqualifying other coverage.
• 2026 limits: $4,400 self-only, $8,750 family, +$1,000 catch-up at 55+.
• The big win for young adults: max it, invest it, pay current medical bills out of pocket, save the receipts.
• After 65, it functions like a Traditional IRA on top of all the medical-expense tax-free withdrawals you’ve already gotten.