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How an HSA Works
A Health Savings Account is a savings and investment account paired with a High-Deductible Health Plan (HDHP). You contribute money — up to the annual IRS limit — into the HSA before taxes. The money grows tax-free through either interest or investments. When you spend it on qualified healthcare expenses, withdrawals are tax-free too. That's the triple tax advantage that makes HSAs the most tax-efficient savings vehicle available to most Americans.
Unlike a Flexible Spending Account (FSA), unused HSA funds roll over indefinitely from year to year. There's no "use it or lose it" deadline. You can contribute at 35, never touch the money, invest it in index funds, and withdraw it tax-free for healthcare at 65 or beyond.
Who Can Open an HSA?
To contribute to an HSA, you must meet all of the following:
- Enrolled in a High-Deductible Health Plan (HDHP) as your primary coverage
- Not enrolled in Medicare (Part A or Part B)
- Not covered by another non-HDHP health plan (e.g., a spouse's traditional PPO)
- Not claimed as a tax dependent on someone else's return
For 2026, an HDHP is defined as a plan with a minimum deductible of $1,700 (self-only) or $3,400 (family), and maximum out-of-pocket limits of $8,500 (self-only) or $17,000 (family), per IRS Revenue Procedure 2025-19. Many employer-sponsored HDHPs qualify. Starting in 2026, bronze and catastrophic plans bought through an ACA marketplace also count as HSA-eligible under the 2025 tax law, which opens HSAs to many self-employed and individual-market buyers.
2026 Contribution Limits
| Coverage Type | Standard Limit | 55+ Catch-Up | Total (55+) |
|---|---|---|---|
| Individual HDHP | $4,400 | $1,000 | $5,400 |
| Family HDHP | $8,750 | $1,000 | $9,750 |
Employer contributions count toward these limits. If your employer contributes $1,500 to your HSA, your personal contribution limit is reduced by $1,500 for that year.
What You Can Spend HSA Funds On
IRS Publication 502 defines qualified medical expenses. Broad categories include:
- Doctor visits, hospital care, surgery, lab work
- Prescription and over-the-counter medications (since 2020)
- Dental care (cleanings, fillings, crowns, orthodontics)
- Vision care (glasses, contacts, LASIK)
- Mental health services
- Medical equipment (crutches, hearing aids, blood pressure monitors)
- After age 65: Medicare Part A (if you pay it), Part B, Part D and Medicare Advantage premiums — but not Medigap (Medicare Supplement) premiums
- Long-term care insurance premiums (up to IRS age-based limits)
Premiums for a working spouse's employer health insurance do not qualify. Cosmetic procedures, gym memberships, and most supplements don't qualify unless prescribed by a doctor.
How to Invest HSA Funds
Most HSA providers offer investment options once your cash balance exceeds a threshold (typically $1,000–$2,000). Common options include mutual funds and ETFs — similar to a 401k investment menu. The best approach: hold the cash minimum needed for near-term medical costs and invest the rest in low-cost index funds. Growth is entirely tax-free.
Not all HSA providers have good investment options. Fidelity, Lively, and HealthEquity are commonly recommended for investment quality, fund selection, and low fees. If your employer's HSA provider has poor investment options, you may be able to transfer funds annually to a better HSA administrator while keeping the employer contribution in the original account.
Using Your HSA as a Retirement Account
Most people use an HSA like a debit card: money goes in, pays this year's medical bills, and never has time to grow. That captures the tax deduction and the tax-free withdrawal but wastes the middle benefit — decades of tax-free investment growth. A $4,400 contribution at 35, invested at 7%, is worth about $33,500 at 65. Spend it on a dental bill now and that growth never happens.
The need is real. Fidelity's 2025 estimate puts lifetime retirement healthcare costs for a 65-year-old at about $172,500 per person in today's dollars — Medicare premiums, deductibles, copays and prescriptions, not counting long-term care. Maxing a self-only HSA at $4,400 a year from 35 to 65 at a 7% return builds roughly $416,000 in nominal dollars; assuming about 4% a year after inflation, that is around $247,000 in today's money — more than one person's estimated need.
Pay out of pocket now, reimburse yourself later
The strategy works because the IRS sets no deadline for reimbursement. Any qualified expense incurred after your HSA was opened can be reimbursed tax-free years or decades later, as long as you weren't already reimbursed or didn't deduct it elsewhere and you keep the documentation. In practice:
- Keep a small cash buffer — $1,000–$2,000 in the HSA's cash portion for emergencies you can't cover from other savings.
- Invest the rest in low-cost index funds once you pass the provider's threshold; a simple stock/bond fund mix is plenty.
- Pay current medical bills from your regular account (or a credit card you pay in full).
- Save every receipt, indefinitely — a dedicated cloud folder works. You'll need them if the IRS ever asks.
- Reimburse yourself in retirement whenever you want tax-free cash, for example to keep taxable IRA withdrawals low in a given year.
How the HSA compares for healthcare costs
| Account | Tax-Deductible Contribution | Tax-Free Growth | Tax-Free Healthcare Withdrawal |
|---|---|---|---|
| HSA | ✓ | ✓ | ✓ |
| Roth IRA | ✗ | ✓ | ✓ (qualified) |
| Traditional IRA / 401k | ✓ | ✓ (tax-deferred) | ✗ (taxable) |
| Taxable brokerage | ✗ | ✗ (taxed on dividends and gains) | ✗ |
For healthcare spending, the HSA is the only account that is tax-free on the way in, while growing, and on the way out. For everything else, the Roth versus traditional choice comes down to your tax rate now versus in retirement.
HSA After Age 65
Two separate things change around 65. First, contributions stop once you enroll in Medicare — not at 65 itself, so someone still working with employer HDHP coverage who delays Medicare can keep contributing. Watch the timing: if you sign up for Medicare after 65, Part A coverage is usually backdated up to six months, so stop contributing six months before you apply to avoid excess contributions. Second, at 65 the 20% penalty on non-medical withdrawals disappears, whether or not you're on Medicare. After 65, non-healthcare withdrawals are taxed as ordinary income — exactly like a traditional IRA withdrawal. Healthcare withdrawals remain permanently tax-free. This makes the HSA uniquely flexible in retirement: it's a dedicated tax-free healthcare account that doubles as a traditional IRA backup.
The balance keeps growing after contributions end, and retirement is full of qualified expenses to spend it on:
- Medicare Part B premiums — the 2026 standard premium is $202.90 a month (about $2,435 a year), higher for upper-income retirees
- Part D and Medicare Advantage premiums
- Dental, vision and hearing aids, which Original Medicare largely doesn't cover
- Deductibles, copays and coinsurance
- Long-term care insurance premiums, up to IRS age-based limits
Part B alone for a couple, held at today's premium for 20 years, comes to nearly $100,000 — and premiums have historically risen faster than general inflation. Paying those premiums from an HSA means the money was never taxed at any point. Medigap premiums are the notable exception: they have to come from other funds.
For a side-by-side comparison with FSAs, see HSA vs. FSA.
Key Takeaways
- An HSA requires HDHP coverage; for 2026 you can contribute $4,400 (self-only) or $8,750 (family), plus $1,000 at 55+
- Contributions, growth and medical withdrawals are all tax-free, and the balance never expires
- Invest the balance and pay current bills out of pocket — receipts can be reimbursed tax-free decades later
- Contributions stop when you enroll in Medicare; the 20% non-medical penalty ends at 65
- HSA money can pay Medicare Part B, D and Advantage premiums tax-free, but not Medigap
- A spouse inherits an HSA intact; any other beneficiary owes income tax on the full balance
Frequently Asked Questions
Who qualifies for an HSA?
You must be enrolled in a High-Deductible Health Plan (HDHP), not enrolled in Medicare, not covered by another non-HDHP, and not a tax dependent. For 2026, an HDHP must have a minimum deductible of $1,700 (self-only) or $3,400 (family).
Does HSA money expire?
No. Unlike FSAs, HSA balances roll over completely every year — unused funds never expire. You can accumulate HSA funds for decades, invest them, and withdraw tax-free for healthcare at any age.
What are the 2026 HSA contribution limits?
$4,400 for self-only HDHP coverage and $8,750 for family HDHP coverage. Age 55+ can contribute an additional $1,000 catch-up: $5,400 self-only, $9,750 family. Employer contributions count toward these limits.
Can I use an HSA for non-medical expenses?
Before age 65: non-medical withdrawals face income tax plus a 20% penalty. After age 65: non-medical withdrawals are taxed as ordinary income but no penalty applies. Healthcare withdrawals are always tax-free at any age.
Can I contribute to an HSA after 65?
Only if you are not enrolled in Medicare. Contributions stop when Medicare coverage begins — for most people at 65, but later if you keep working with HDHP coverage and delay enrolling. Existing funds can stay invested and be withdrawn tax-free for qualified medical expenses (including Medicare premiums) indefinitely.
Is there a time limit on HSA reimbursements?
No. The IRS sets no deadline, so you can pay a qualified expense today and reimburse yourself from the HSA decades later, with tax-free growth in between. The expense must have been incurred after the HSA was opened, and you need to keep the receipts.
Can I use HSA funds for Medicare premiums?
Yes, once you're 65: Medicare Part B, Part D and Medicare Advantage premiums are qualified expenses and can be paid tax-free. Medigap (Medicare Supplement) premiums are not qualified.
What happens to my HSA when I die?
If your spouse is the beneficiary, the account simply becomes their HSA with all its tax advantages. Any other beneficiary must include the full balance in taxable income for the year of death, so a large HSA is usually best spent down in retirement or left to a spouse.