Reviewed by Dustin Brown, MS, FACHE. Last reviewed July 2026.
A Health Savings Account, or HSA, is a tax-advantaged account for medical costs, and it carries a rare triple tax advantage: money goes in tax-free, grows tax-free, and comes out tax-free when spent on qualified health expenses. For 2026 you can contribute up to $4,400 for self-only coverage or $8,750 for a family, but only if you are paired with a qualifying high-deductible health plan. One rule catches many people near retirement: enrolling in Medicare ends your ability to contribute, and there is a six-month lookback trap. Here is how an HSA actually works.
The Triple Tax Advantage
No other account offers all three of these at once.
Contributions are tax-free. Money you put in reduces your taxable income. Growth is tax-free. Interest and investment gains are never taxed. Withdrawals are tax-free when used for qualified medical expenses.
That combination is what makes an HSA more tax-efficient than a 401(k) or IRA for healthcare costs.
You Need a Qualifying Health Plan
You can only contribute to an HSA if you are enrolled in a high-deductible health plan (HDHP) and have no other disqualifying coverage.
The IRS sets the thresholds that make a plan qualify, and they change yearly.
| Figure | 2025 | 2026 |
|---|---|---|
| Contribution limit, self-only | $4,300 | $4,400 |
| Contribution limit, family | $8,550 | $8,750 |
| Catch-up, age 55 and over | $1,000 | $1,000 |
| HDHP minimum deductible, self-only | $1,650 | $1,700 |
| HDHP minimum deductible, family | $3,300 | $3,400 |
| HDHP out-of-pocket maximum, self-only | $8,300 | $8,500 |
| HDHP out-of-pocket maximum, family | $16,600 | $17,000 |
If you are 55 or older you can add the $1,000 catch-up contribution on top of the limit.
The Medicare Rule, and the Six-Month Trap
This is the single most costly mistake people make with HSAs, so it deserves care.
Once you enroll in any part of Medicare, including Part A alone, you can no longer contribute to an HSA. You can still spend what is already in the account, including on Medicare premiums and out-of-pocket costs, but new contributions must stop.
The trap is the six-month lookback. If you enroll in Medicare or claim Social Security after age 65, Part A is backdated by up to six months, though never before the month you turned 65. Any HSA contributions made during that retroactive window become excess contributions subject to a 6% excise tax.
Because claiming Social Security at or after 65 triggers automatic Part A enrolment, the safe practice is to stop HSA contributions about six months before you plan to enrol in Medicare or claim Social Security.
What You Can Spend It On
Qualified medical expenses include deductibles, copays, prescriptions, dental care, and vision care, among many others. The IRS publishes the full list.
Spending on non-qualified expenses before age 65 costs you: the withdrawal is taxed as income plus a 20% penalty.
What Happens at 65
At 65 the account becomes far more flexible, which is why it is sometimes called a “stealth IRA.”
You can withdraw HSA money for any purpose without the 20% penalty. Non-medical withdrawals are simply taxed as ordinary income, exactly like a traditional IRA. Withdrawals for qualified medical expenses remain completely tax-free.
It Is Yours to Keep
An HSA is owned by you, not your employer. It goes with you when you change jobs, and unused money rolls over year after year rather than being forfeited. Once your balance is above a broker’s minimum, you can usually invest it, which is where the tax-free growth becomes powerful over decades.
Common Mistakes
Contributing while enrolled in Medicare or above the annual limit. Missing the six-month lookback when enrolling in Medicare. Having disqualifying secondary coverage, such as a spouse’s general-purpose FSA. Leaving the whole balance in cash instead of investing. And throwing away receipts, since you can reimburse yourself years later for a past qualified expense if you kept the record.
HSA FAQs
How much can I contribute to an HSA in 2026?
Up to $4,400 for self-only coverage or $8,750 for family coverage, plus a $1,000 catch-up if you are 55 or older. You must be enrolled in a qualifying high-deductible health plan.
What is the triple tax advantage?
Contributions go in tax-free, the money grows tax-free, and withdrawals for qualified medical expenses come out tax-free. No other account offers all three.
Can I have an HSA on Medicare?
You can keep and spend an existing HSA, but you cannot contribute once enrolled in any part of Medicare, including Part A. Watch the six-month lookback when you enrol after 65.
What happens to my HSA at 65?
You can withdraw for any purpose without penalty, with non-medical withdrawals taxed as income like a traditional IRA. Medical withdrawals stay tax-free.
What if I use it for something non-medical before 65?
The withdrawal is taxed as income and hit with an additional 20% penalty. After 65 the penalty no longer applies.
Do I lose the money if I change jobs or do not use it?
No. The account is yours, it moves with you between jobs, and the balance rolls over every year rather than being forfeited.
