Quick facts
- 2026 contribution cap: $4,400 self-only, $8,750 family
- Catch-up at 55 or older: an extra $1,000
- Required plan deductible: at least $1,700 self-only, $3,400 family
- Deadline for 2026 contributions: April 15, 2027
An HSA is a savings account that only one kind of health plan unlocks
A health savings account is a bank or brokerage account with unusually generous tax rules attached.
You cannot simply open one. Your health insurance has to qualify you first.
That plan must be a high-deductible health plan, and the IRS defines that with hard numbers.
For 2026, the deductible has to be at least $1,700 for self-only coverage or $3,400 for a family.
The plan's out-of-pocket maximum also has to stay at or under $8,500 self-only and $17,000 for a family.
More employers are now auto-enrolling workers into these accounts and matching contributions the way they do with a 401(k).
That makes it worth knowing the rules even if you never went looking for one.
The tax treatment is the only reason anyone bothers
Money goes in untaxed, grows untaxed, and comes out untaxed when spent on qualified medical care.
No other account in the tax code does all three.
A 401(k) taxes the withdrawal. A Roth IRA taxes the deposit. An HSA does neither, provided the money pays for care.
Contributions made through payroll also escape Social Security and Medicare tax, which a deduction on your return does not.
The balance rolls over every year. It is not a flexible spending account and there is no use-it-or-lose-it deadline.
The account belongs to you, not your employer, so changing jobs or retiring does not touch it.
Most administrators let you invest the balance in funds once it clears a cash threshold, often somewhere around $1,000.
An HSA is the only account that is untaxed going in, untaxed while it grows, and untaxed coming out.
Eligibility is judged month by month, and Medicare ends it
You are eligible for any month you are covered by a qualifying plan on the first day of that month.
Other coverage disqualifies you, including a spouse's traditional plan or a general-purpose flexible spending account.
Being claimed as someone else's dependent disqualifies you too.
Enrolling in any part of Medicare stops contributions permanently, and this is where people over 60 get caught.
Social Security enrollment after 65 comes with up to six months of retroactive Part A coverage.
Contributions made during those retroactive months become excess contributions, with a penalty attached.
The fix is to stop contributing several months before you file for Social Security.
Bottom line: If you plan to claim Social Security after 65, stop HSA contributions at least six months earlier. The retroactive Medicare start date is the single most common HSA mistake in this age group.
Spending rules loosen considerably at 65
Before 65, a withdrawal for anything other than qualified medical care is taxed as income and hit with a 20% penalty.
At 65 that penalty disappears entirely.
Non-medical withdrawals are then simply taxed as income, which makes the account behave like a traditional IRA with a medical exemption.
Medical withdrawals stay tax-free at any age, including after 65.
Medicare Part B, Part D, and Advantage premiums count as qualified expenses. Medigap premiums do not.
Long-term care insurance premiums qualify up to an age-based limit that rises each year.
There is also no deadline on reimbursing yourself.
A receipt from a procedure you paid out of pocket in 2026 can be reimbursed decades later.
The only condition is that the expense came after the account was opened.
This is general information rather than tax advice, and the details turn on your own coverage. Confirm your situation with a tax professional.
IRS Publication 969 โ Health Savings AccountsOfficial source โ Internal Revenue Service โ
