Health savings accounts and flexible spending arrangements are both tax-advantaged ways to pay medical costs, and they are frequently confused with each other. They differ on almost every point that matters: who can open one, who owns the money, and what happens to a balance at the end of the year.
What makes a plan a high deductible health plan
A health savings account is not something you can open on its own. You must be covered by a qualifying high deductible health plan, and the IRS defines that term with specific numbers that adjust annually.
For calendar year 2026, under IRS Rev. Proc. 2025-19, a qualifying high deductible health plan must have:
| Requirement | Self-only coverage | Family coverage |
|---|---|---|
| Minimum annual deductible | $1,700 | $3,400 |
| Maximum out-of-pocket | $8,500 | $17,000 |
Those out-of-pocket figures count deductibles, copayments and other amounts, but not premiums. Note that they are lower than the general marketplace out-of-pocket ceiling, so a plan can comply with marketplace rules and still fail the HSA test.
The IRS has published the corresponding 2027 figures as well, and the amounts change most years, so confirm the current year before relying on any of them.
Two related points:
- Preventive care is an exception. A qualifying plan may cover preventive care before the deductible without losing its status. The ability to cover telehealth and other remote care before the deductible was made permanent for plan years beginning on or after January 1, 2025.
- Bronze and catastrophic exchange plans are treated as HSA-compatible as of January 1, 2026, regardless of whether they meet the general high deductible plan definition. That materially widened the set of marketplace plans that can be paired with an account.
Health savings account rules
Contribution limits for 2026 are $4,400 for self-only coverage and $8,750 for family coverage, with an additional $1,000 catch-up contribution available from age 55. Contributions from all sources, including an employer, count toward the limit.
The features that distinguish an HSA:
- The money is yours. The account belongs to you, not your employer, and it goes with you when you change jobs or plans.
- The balance rolls over. There is no use-it-or-lose-it deadline. Unspent funds remain in the account indefinitely.
- Triple tax treatment. Contributions are generally tax-deductible or made pre-tax, growth is tax-deferred, and withdrawals for qualified medical expenses are tax-free.
- It can be invested once the balance reaches a threshold the custodian sets, which is why some people treat an HSA as a long-term account rather than a spending account.
The eligibility restrictions are strict. You generally cannot contribute if you are enrolled in Medicare, if you can be claimed as a dependent on someone else's return, or if you have other coverage that is not a qualifying high deductible plan. That last restriction catches people whose spouse's general-purpose FSA covers them.
Withdrawals for non-qualified expenses are taxable and, before a specified age, subject to an additional penalty. The IRS defines what counts as a qualified medical expense, and that definition is broader than many people assume.
Flexible spending arrangement rules
An FSA is an employer-established account. The differences from an HSA are structural.
- It is tied to your employer. You generally lose access when you leave the job, subject to any COBRA continuation rights the plan offers.
- It has a use-it-or-lose-it rule. Funds not spent by the deadline are forfeited. Plans may offer either a limited carryover of unused funds or a grace period after the plan year ends, but not both, and offering either is optional.
- No high deductible plan is required. You can have an FSA with a conventional plan.
- The full election is available immediately. In a health FSA, your full annual election is generally available from the start of the plan year, even though you fund it through payroll over time. That is a real advantage over an HSA, which you can only spend from what has been deposited.
- Contribution limits are set separately by the IRS and adjust annually.
A limited purpose FSA, restricted to dental and vision expenses, can be paired with a high deductible plan and an HSA without disqualifying HSA contributions. A general purpose health FSA cannot.
Choosing a high deductible plan is a separate question
Being eligible for an HSA is a reason to consider a high deductible plan, not a reason to choose one. The plan still has to work for the care you actually use.
Points worth weighing:
- The deductible is real money you may spend before the plan pays. An account only helps if you can fund it.
- The out-of-pocket maximum is your worst case, and on a qualifying plan it is capped below the general marketplace ceiling.
- Some care may still carry copays or be covered before the deductible, depending on plan design and the preventive care exception.
- Cost-sharing reductions require a silver plan. If you qualify for them, a bronze high deductible plan may leave a substantial benefit on the table, as covered in marketplace subsidies explained.
- Family deductible structure matters. Aggregate deductibles are common on high deductible plans and behave differently from embedded ones, as covered in deductible, copay, coinsurance and out-of-pocket max.
Practical habits
- Save receipts. Qualified expenses can generally be reimbursed from an HSA later, even years later, provided the expense was incurred after the account was established. Documentation is what makes that possible.
- Watch the Medicare timing. HSA contributions must stop once Medicare coverage begins, and enrollment can be retroactive in some situations. Getting this wrong creates excess contributions that must be corrected.
- Name a beneficiary on the account. An HSA passes by beneficiary designation, and the tax treatment differs depending on who inherits it.
- Coordinate with a spouse's plan. Two households' worth of coverage and accounts interact in ways that can quietly disqualify contributions.
Contribution limits, plan qualification rules and tax treatment are set by federal law and change most years. Plan designs vary by insurer and by state. For your own situation, consult the IRS guidance, a tax professional, your plan administrator, or a licensed agent.
To get connected with licensed carriers and agents offering health plans in your area, you can request health insurance quotes.