What Is an HSA? How It Works, 2026 Limits, and New Rules

What is an HSA? An HSA, or health savings account, is a tax-advantaged account you can use to pay qualified medical expenses if you are eligible for one. In 2026, HealthCare.gov says the contribution limit is $4,400 for self-only coverage and $8,750 for family coverage, and new federal guidance expanded HSA access by treating individual-market Bronze and Catastrophic plans as HSA-compatible for months beginning after December 31, 2025.

That makes HSAs more relevant in 2026 than a lot of older explainers suggest. The basic idea is still the same: you use tax-advantaged money for qualified medical costs, unused funds roll over, and the account stays with you. This guide explains what an HSA is, how it works, who qualifies, and what to watch out for.

What is an HSA?

HealthCare.gov defines a Health Savings Account as a savings account that lets you set aside money on a pre-tax basis to pay for qualified medical expenses. By using untaxed dollars for deductibles, copayments, coinsurance, and some other costs, you may lower your overall health care costs.

In plain English:

the HSA is the account
the money inside it is meant for qualified medical expenses
the tax benefit is the reason it matters

The Office of Personnel Management describes HSAs as offering a "triple-tax advantaged" structure: contributions can be tax-deductible or pre-tax, interest and earnings can grow tax-free, and withdrawals for qualified medical expenses are tax-free.

Who is eligible to open and contribute to an HSA?

IRS Publication 969 says you must meet all of these requirements to be an eligible individual who can contribute to an HSA:

you are covered by a high deductible health plan, or HDHP, on the first day of the month
you do not have disqualifying other health coverage
you are not enrolled in Medicare
you cannot be claimed as a dependent on someone else's tax return

What changed for HSA eligibility in 2026?

Notice 2026-5 and HealthCare.gov both reflect a major 2026 change: individual-market Bronze and Catastrophic plans are treated as HSA-compatible for months beginning after December 31, 2025. HealthCare.gov now says all 2026 Bronze and Catastrophic health plans are eligible for HSAs, and plans in other categories may also qualify depending on their deductibles and out-of-pocket limits.

The IRS also says the One, Big, Beautiful Bill made permanent a safe harbor for telehealth and other remote care services in HSA-compatible plans. So if you are checking older advice, be careful. The 2026 rules are not identical to the 2024 or 2025 rules.

How does an HSA work?

The basic flow is simple:

Enroll in an HSA-eligible plan.
Open the HSA with the trustee or custodian connected to your plan or employer, if applicable.
Contribute money yourself, receive employer contributions, or both.
Use the balance for qualified medical expenses now, or leave some or all of it in the account.
Keep records in case you need to prove the withdrawals were for qualified expenses.

OPM says you own the HSA and it is yours to keep, even when you change plans or retire. That is one of the biggest differences between an HSA and an FSA. The account is portable.

OPM says unused funds and interest carry over from year to year without limit. HealthCare.gov makes the same point: the balance rolls over year to year, so you can build up money for health care expenses later.

Depending on the custodian, some HSA balances remain in a cash or money-market portion, while others can also be invested. OPM notes that the money-market portion of an HSA is normally federally insured, while stocks, bonds, and mutual funds are subject to normal investment risk.

What are the 2026 HSA contribution limits?

HealthCare.gov says the 2026 contribution limits are:

Coverage type	2026 contribution limit
Self-only	`$4,400`
Family	`$8,750`

IRS guidance also keeps the additional catch-up contribution at $1,000 for eligible individuals age 55 or older.

There is no required minimum contribution. You can contribute less than the maximum if that is what fits your budget.

Two other 2026 thresholds matter because they help determine whether a plan counts as an HDHP under the regular rules. IRS guidance says that for 2026, an HDHP generally must have:

Rule	Self-only	Family
Minimum deductible	`$1,700`	`$3,400`
Maximum out-of-pocket expenses	`$8,500`	`$17,000`

Because of the 2026 law changes, individual-market Bronze and Catastrophic plans can still be treated as HSA-compatible even if they do not meet those regular HDHP thresholds.

One more limit trap: employer contributions count toward your annual maximum. IRS Publication 969 says employer contributions reduce the amount you or anyone else can contribute to your HSA for the year.

What can you pay for with HSA money?

The short answer is qualified medical expenses. HealthCare.gov specifically says HSA money can help pay deductibles, copayments, coinsurance, and some other expenses. IRS Publication 969 says withdrawals are tax-free when used for qualified medical expenses, and it points to IRS Publication 502 for the fuller expense list.

Can you use HSA money for premiums?

Usually no, but there are exceptions.

HealthCare.gov says HSA funds generally may not be used to pay premiums. IRS Publication 969 gives the main exceptions:

qualifying long-term care insurance
COBRA or other health care continuation coverage
health coverage while receiving unemployment compensation
Medicare and certain other health care coverage if you are 65 or older, but not Medigap

That is worth calling out because a lot of quick explainers oversimplify this as either "yes" or "no." The accurate answer is "generally no, with several IRS-listed exceptions."

Why do people like HSAs so much?

The main benefits are straightforward.

1. The tax treatment is unusually strong

This is the big one. OPM summarizes the three advantages clearly:

your own contributions can be tax-deductible or pre-tax
interest and earnings can be tax-free
qualified withdrawals can be tax-free

That combination is why HSAs are often mentioned alongside retirement accounts like a Roth IRA, even though the purpose is different.

2. The money does not expire

Unlike an FSA, unused HSA money rolls over year after year. That makes it easier to use the account strategically instead of racing to spend the balance before year-end.

3. The account is portable

If you leave a job or switch plans, you keep the HSA. That portability is a real advantage over employer-tied accounts that disappear or reset.

What are the downsides or traps of an HSA?

The account is powerful, but it is not universally perfect.

1. You must stay eligible to keep contributing

The contribution benefit only works while you are an eligible individual. IRS Publication 969 says that beginning with the first month you are enrolled in Medicare, your HSA contribution limit is zero. That can surprise people who keep contributing after turning 65 without realizing Medicare enrollment or retroactive coverage affects the limit.

2. Nonqualified withdrawals can get expensive

IRS Publication 969 says distributions used for nonqualified expenses are generally included in income and may trigger a 20% additional tax. The extra tax generally does not apply after age 65, disability, or death, but ordinary income tax can still apply.

That means an HSA is not a checking account with bonus tax treatment. If you use it casually, the tax break can disappear fast.

3. The health plan tradeoff is real

An HSA usually comes with a higher-deductible plan structure. Lower premiums can be attractive, but the out-of-pocket exposure may feel uncomfortable if you expect heavy medical use or do not keep enough cash on hand. The account can help, but the plan design still matters.

4. Recordkeeping matters

If you reimburse yourself later or hold receipts for future reimbursement, you need clean records. The IRS cares about whether the withdrawal was for a qualified expense, not whether you meant well.

HSA vs FSA: what is the difference?

This is one of the most common follow-up questions in the HSA SERP, and it is worth answering directly.

Feature	HSA	FSA
Eligibility	Requires an HSA-eligible plan and no disqualifying coverage	Employer plan rules determine access
Ownership	You own it	Usually employer-plan based
Rollover	Yes, unused funds roll over	Often use-it-or-lose-it, with limited exceptions
Portability	Yes, you keep it	Usually tied more closely to your employer plan

When does an HSA make sense?

An HSA often makes sense when:

you are eligible under the IRS rules
you want the tax benefits and can actually fund the account
you can handle the higher-deductible structure of your health plan
you want a long-term medical-expense reserve

It is often a weaker fit when:

you are not actually eligible to contribute
you need every dollar of cash flow for current expenses
the higher deductible would create too much financial stress
you are using it as a substitute for a basic cash buffer

That last point matters. An HSA does not replace broader planning. Articles like what is a good savings rate, what is net worth, and what is a brokerage account help fill in that bigger picture.

FAQ: What is an HSA?

Is an HSA just for doctor visits?

No. HSAs can be used for many qualified medical expenses, not just office visits, but the tax-free treatment depends on whether the expense actually qualifies under IRS rules.

Can I contribute to an HSA if I have Medicare?

Generally no. IRS Publication 969 says that starting with the first month you are enrolled in Medicare, your HSA contribution limit is zero.

Do HSA funds expire at the end of the year?

No. Unused HSA funds roll over year to year. That is one of the biggest advantages of the account.

Can I use HSA money for anything after age 65?

You can take nonqualified withdrawals after age 65 without the extra 20% tax, but ordinary income tax can still apply.

Is an HSA better than a Roth IRA?

That is the wrong comparison in most cases. An HSA is for qualified medical expenses and only works if you are eligible. A Roth IRA is a retirement account. Many savers use both if their budget allows.

The bottom line

What is an HSA? It is a health savings account that lets eligible people use tax-advantaged money for qualified medical expenses. In 2026, the basics still matter most: you must be eligible, you need to know the contribution limits, and you need to use withdrawals carefully.

What makes 2026 different is that the rules expanded. HealthCare.gov now says all 2026 Bronze and Catastrophic plans are HSA-eligible, and IRS guidance reflects other HSA-friendly changes like permanent telehealth relief. That makes older HSA advice easier to get wrong.

If you want to track an HSA alongside your cash, investments, debt, and total net worth, Surplus Budget can help you see the full picture in one place instead of leaving another meaningful account off to the side.