Guide to HSAs

What is an HSA?

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.
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, in many cases)
• Enrolled in a general-purpose Flexible Spending Account (FSA)

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.

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 in low-cost index funds, just like a 401(k). Most HSA providers offer an investment option once your cash balance crosses a threshold (often $1,000–$2,000).
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.
5. At age 65, you can withdraw HSA funds for any reason, paying only ordinary income tax (like a Traditional IRA). 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 (with limits)
• Medicare premiums (Parts B, D, and Medicare Advantage — not Medigap)

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

Where to open one

Many employers offer an HSA through a payroll provider — that’s usually the easiest path, especially because contributions through payroll bypass FICA tax (an extra 7.65% saving you don’t get from a personal HSA).

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 transfer between HSAs without tax consequence (a “trustee-to-trustee transfer”), so 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% real return 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 is solid. 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.