How an HSA works
An HSA is held by a bank, brokerage or other trustee and sits beside a high-deductible health plan. You pay bills from it or out of pocket until the deductible is met. Unlike a flexible spending account, the money never expires: it rolls over, follows you between jobs, and many trustees let you invest it.
To contribute for a month, you must be covered by a qualifying plan on the first day of that month, have no other health coverage apart from permitted extras such as dental, vision or a limited-purpose FSA, not be enrolled in Medicare, and not be claimable as someone else’s dependent. There is no income limit and no earned-income test. Anyone, including your employer, can add money, but every dollar counts against your one annual limit.
For 2026 a qualifying plan needs a deductible of at least $1,700 for self-only coverage or $3,400 for family coverage, with out-of-pocket costs capped at $8,500 or $17,000. The One Big Beautiful Bill Act also made bronze and catastrophic plans available through the ACA Marketplace HSA-compatible from January 1, 2026.
The triple tax break, and where it stops
Money goes in untaxed. Employer contributions, including your own salary reductions through a cafeteria plan, skip income tax and also Social Security and Medicare tax, a FICA saving of 7.65% on wages below the wage base. Money you deposit yourself is deductible even if you don’t itemize, but it doesn’t recover FICA.
Growth isn’t taxed, and a withdrawal is tax-free when it pays qualified medical expenses for you, your spouse or your dependents incurred after the HSA was opened. You can reimburse yourself in a later year, as long as your records show the bill wasn’t paid another way or deducted.
Any other withdrawal is taxable income, plus a 20% additional tax unless you are 65 or older, disabled, or the payout follows your death. From 65 it is simply taxed as income, much like a traditional IRA withdrawal.
States don’t all follow the federal rules. California, for one, doesn’t recognize HSAs on its 2025 returns: contributions aren’t deductible and earnings are taxed each year, so check your state income tax treatment.
HSA rules and limits for 2026
The annual limit belongs to you, not to each account. Your deposits, your employer’s and anyone else’s all count toward one figure, set by the coverage you have on the first day of each month. Change jobs midyear and it is easy to overshoot, because each employer sees only its own payroll deposits. Married couples share one family limit, and each spouse’s catch-up contribution must go into that spouse’s own HSA, because joint HSAs don’t exist.
- Limits: $4,400 for self-only or $8,750 for family coverage in 2026, plus $1,000 for each eligible person who is 55 or older by year-end.
- Deadline: 2026 contributions can be made until April 15, 2027.
- Last-month rule: if you are eligible on December 1, you may contribute the full year’s amount, but you must stay eligible through the next calendar year or the extra becomes taxable, plus 10%.
- Medicare: your limit drops to zero from the first month you are enrolled, including backdated months.
- Excess contributions: a 6% excise tax applies for each year they remain, unless you withdraw them and their earnings by your return’s due date, including extensions.
- Direct primary care: from 2026, arrangements costing up to $150 a month ($300 if they cover more than one person) no longer block contributions, and HSA money can pay the fees.
- IRA transfer: once in your lifetime you can move up to one year’s limit directly from an IRA into an HSA, then must stay eligible for the next 12 months.
HSA vs. health FSA vs. HRA
All three pay medical bills with untaxed money, but ownership sets them apart. An HSA is your property: anyone can fund it, it can grow for decades and it survives a job change. A health FSA is an employer plan funded mostly from your paycheck, with the full election available on day one but little that carries into the next year. An HRA is funded only by your employer, which decides the amount and whether unused money carries over. So an HSA can work as a savings vehicle, while the other two are spending tools for one plan year at a time.
Using an HSA as a retirement account
Because unspent money compounds without tax, some savers pay current medical bills from checking, invest the HSA, and keep receipts to reimburse themselves years later. That works only for expenses incurred after the account was opened and never deducted.
From 65, qualified expenses include Medicare premiums for Part B, Part D and Medicare Advantage, though not Medigap. Premiums for qualified long-term care insurance count at any age, up to a limit that rises with age: for 2026, $4,960 a person at 61–70 and $6,200 over 70.
Watch the Medicare handoff. Part A coverage can be backdated when you sign up late, and contributions for backdated months become excess contributions. Medicare.gov advises you and your employer to stop contributing six months before you retire or apply for Social Security benefits.
Plan the inheritance too. A spouse named as beneficiary simply takes over the HSA as their own. Anyone else receives the whole balance as taxable income in the year of death, reduced only by the account holder’s medical bills that the beneficiary pays within a year.
Illustrative numbers
A 56-year-old with family coverage funding an HSA through payroll in 2026
- Coverage limit
- $4,400 for self-only or $8,750 for family coverage in 2026, based on the plan you have on the first day of each month
- Catch-up
- $1,000 if you are 55 or older by the end of the year, otherwise $0
- Months eligible
- Months in which you are an eligible individual on the first day, from 0 to 12
If you are eligible on December 1, the last-month rule lets you skip the proration and use the full-year limit.
Family coverage limit$8,750
Age-55 catch-up$1,000
Total contributed through payroll$9,750
Federal income tax avoided at 22%$2,145
Social Security and Medicare tax avoided at 7.65%$746
First-year federal tax saving$2,891
About $2,891 of 2026 federal tax is avoided, before any state effect, assuming a 22% marginal rate and wages under the $184,500 Social Security wage base. Depositing the same $9,750 directly and deducting it would save the $2,145 but not the $746. If the money is invested and later spent on qualified care, its growth is never taxed.
At a glance
HSA, health FSA and HRA compared (2026 rules)
| Feature | HSA | Health FSA | HRA |
|---|---|---|---|
| Who funds it | You, your employer or anyone else | Mostly your salary reduction; employer may add | Employer only |
| Coverage required | HSA-eligible high-deductible plan | Offered through your employer | Offered through your employer |
| 2026 limit | $4,400 self-only or $8,750 family, plus $1,000 at 55+ | $3,400 of salary reduction per employee | Set by employer; no federal cap for most |
| Unused money | Rolls over and stays yours | Forfeited beyond a $680 carryover or a 2½-month grace period, if offered | Carries over only if the plan allows; never refunded |
| Changing jobs | Account goes with you | Tied to that employer’s plan | Tied to that employer’s plan |
| Insurance premiums | Only COBRA, coverage while on unemployment, long-term care and, from 65, health coverage other than Medigap | Not allowed | Allowed if the plan covers them |
| Non-medical use | Allowed but taxed, plus 20% before 65 | Not allowed | Not allowed |
Put it in your plan
HSA in MoneyWhatIf
On an HSA’s account card, choose self-only or family coverage and enter any employer funding. The projection fits contributions to the 2026 HSA limits, shares family coverage across the household, keeps each owner’s catch-up separate, and stops new deposits at 65, its Medicare age. A withdrawal is tax-free only up to the qualified medical costs the plan has modeled, such as Medicare and IRMAA costs, declared medical spending and eligible long-term care, less anything already deducted; the rest is ordinary income, with a 20% charge before 65. The estate page counts an HSA as tax-deferred money.
Common questions
HSA FAQs
Can I have an HSA and an FSA at the same time?
Only if the FSA is limited. A limited-purpose FSA for dental, vision and preventive care, or a post-deductible FSA, keeps you eligible. A general-purpose health FSA, including a spouse’s that covers you, blocks HSA contributions for every month it applies, and even its grace period counts unless your balance was zero at the end of the prior plan year. A dependent care FSA doesn’t affect HSA eligibility.
What happens to my HSA if I leave my high-deductible plan or retire?
The account stays yours. You can’t add new money for months when you aren’t eligible, but you can keep investing the balance and withdraw it tax-free for qualified medical expenses at any age, including Medicare premiums after 65. If you later return to an HSA-eligible plan, contributions can resume for those months.
Is an HSA worth the high deductible?
It depends on the whole package, not the tax break alone. Weigh the plan’s lower premiums, any employer HSA deposit and your tax saving against the extra you could pay before coverage starts. For 2026 an HSA-eligible plan can leave you paying up to $8,500 out of pocket for self-only coverage or $17,000 for family coverage, so it tends to suit people with cash reserves and modest expected medical bills.
Can I open an HSA for my child?
Not while you can claim the child as a dependent, because a dependent can’t be an HSA-eligible individual. You don’t need one: your own HSA can pay your dependents’ qualified medical bills tax-free. To save money in a child’s own name, look at a custodial account or a 529 plan instead.
What counts as a qualified medical expense for an HSA?
Broadly, anything that would qualify for the itemized medical deduction: doctor and hospital bills, prescriptions, over-the-counter medicines, menstrual care products, and dental and vision care for you, your spouse and your dependents. Insurance premiums generally don’t count. The exceptions are COBRA, coverage while you receive unemployment benefits, qualified long-term care insurance, and, from 65, Medicare and other health coverage premiums, though not Medigap.
Should I fund an HSA before a 401(k)?
It depends on your employer and your health costs. A 401(k) match is an immediate return an HSA can’t replicate, so many savers capture it first. Beyond the match, payroll HSA dollars avoid FICA, which 401(k) deferrals don’t, and money spent on medical care is never taxed. A 401(k) offers far higher limits and doesn’t require a high-deductible plan.