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An HSA (health savings account) lets you save pre-tax money for medical costs with no use-it-or-lose-it rule, but you must be enrolled in an HSA-eligible high-deductible health plan to contribute. An FSA (flexible spending account) is available with most employer plans regardless of deductible, but unspent funds typically forfeit at year-end. If you qualify for both, the HSA almost always wins for long-term value. Here is the full comparison for 2026.
Key Takeaways
- HSA 2026 contribution limits: $4,300 self-only / $8,550 family / +$1,000 catch-up age 55+. Verify at irs.gov.
- Healthcare FSA 2026 limit: approximately $3,300. Verify at irs.gov before your employer’s enrollment window closes.
- HSA funds roll over forever and can be invested. FSA funds typically forfeit at year-end (with limited grace period or rollover options per plan).
- You need an HSA-eligible HDHP to contribute to an HSA. FSAs are available with most employer plans.
- You can have both accounts simultaneously only if the FSA is a limited-purpose FSA (dental and vision only).
HSA vs FSA: Side-by-Side Comparison
What Is an HSA?
A health savings account is a personal, tax-advantaged account you own and control. You open it yourself through an HSA provider (your employer may offer one, or you can open one independently), and contributions are pre-tax whether they come through payroll or directly from your bank account. The money grows tax-free if you invest it, and withdrawals for qualified medical expenses are also tax-free. That three-way tax advantage is the reason financial planners call the HSA the best tax shelter most people are not using.
The key constraint: you must be enrolled in an HSA-eligible HDHP for the entire contribution period. The moment you switch to a non-HDHP plan, you stop being able to contribute. But the money already in the account stays yours indefinitely and can still be spent on qualified medical expenses.
After age 65, the HSA functions like a traditional IRA for non-medical withdrawals — you pay income tax but no penalty. For medical expenses, withdrawals remain completely tax-free at any age. This makes a well-funded HSA one of the most flexible retirement assets available.
What Is a Healthcare FSA?
A flexible spending account is an employer-sponsored benefit that lets you set aside pre-tax dollars for medical, dental, and vision expenses during the plan year. You elect a contribution amount at enrollment, and it is deducted from your paychecks pre-tax throughout the year. Most FSAs offer the full annual election amount as a lump sum on day one of the plan year, which means you can use $3,300 in January even if you have not contributed that much yet.
The significant limitation is the use-it-or-lose-it rule. Funds not spent by the end of the plan year (or the grace period, if your employer offers one) are forfeited. Employers can offer either a 2.5-month grace period or a rollover of up to approximately $660 into the next plan year, but they are not required to offer either. Check your plan documents before electing a large FSA contribution.
What Are the 2026 Contribution Limits?
The IRS adjusts both limits annually for inflation. The 2026 figures below reflect IRS guidance; verify the current amounts at irs.gov before your enrollment window closes:
What Expenses Do They Cover?
Both accounts cover the same broad list of IRS-qualified medical expenses, which includes doctor visits, prescriptions, dental care, vision care, mental health treatment, chiropractic care, and hundreds of other items defined in IRS Publication 502. Key examples:
- Deductibles, copays, and coinsurance on your health plan
- Prescription medications
- Dental work (fillings, crowns, orthodontia)
- Vision exams, glasses, and contact lenses
- Mental health therapy
- Hearing aids and batteries
- Over-the-counter medications (since the CARES Act, no prescription required)
- Menstrual care products
Neither account covers cosmetic procedures, gym memberships (unless prescribed for a specific medical condition), or health insurance premiums in most circumstances. HSAs have one notable exception: you can use HSA funds to pay Medicare Part B and Part D premiums after age 65, and COBRA premiums if you lose job-based coverage.
Can You Have Both an HSA and an FSA?
Not a standard healthcare FSA. If you are contributing to an HSA, you cannot also have a general-purpose healthcare FSA, because the FSA could be used before your HDHP deductible is met, which violates the HDHP rules.
What you can have alongside an HSA:
- Limited-purpose FSA (LPFSA): covers dental and vision only. This is the common pairing — maximize HSA for general medical costs and use the LPFSA for dental and vision to stretch the pre-tax benefit further.
- Dependent care FSA: covers childcare and elder care costs, completely separate from healthcare accounts. Having a dependent care FSA does not affect your HSA eligibility.
HSA or FSA: Which Should You Use?
If you have an HSA-eligible HDHP and your employer offers an FSA, the question resolves to: do you want to maximize long-term tax-advantaged savings or minimize your tax bill on near-term medical expenses?
Choose the HSA if: you want the rollover, you are healthy enough to let the balance grow, you are building toward retirement with tax-free medical savings, or you are self-employed (FSAs are not available to self-employed people without employees — the HSA is your only option).
Choose the FSA if: you are not in an HDHP and therefore cannot use an HSA, you have predictable high medical expenses this year that you want to pay pre-tax, or your employer contributes to the FSA (free money beats the rollover argument if the employer match is large enough).
Consider both if: you have an HDHP and want to also cover dental and vision pre-tax. Open the HSA for general medical costs and elect an LPFSA for dental and vision. This extracts the maximum pre-tax benefit from both accounts simultaneously.
For the full HDHP vs PPO decision that determines whether you can use an HSA in the first place, see the HDHP + HSA vs PPO guide. For how the HDHP fits into your overall open enrollment decision, see the plan comparison guide and the Open Enrollment 2026 Complete Guide.
Frequently Asked Questions
What is the HSA contribution limit for 2026?
$4,300 for self-only HDHP coverage and $8,550 for family HDHP coverage, with a $1,000 catch-up allowed for those age 55 and older. Verify the current figures at irs.gov before contributing, as limits adjust annually for inflation.
What happens to FSA money I do not use?
It is forfeited unless your employer offers a grace period (up to 2.5 months into the next year) or a limited rollover (approximately $660). Check your plan documents. This is the primary reason to estimate FSA contributions conservatively rather than maximizing them.
Can I use my HSA for non-medical expenses?
Yes, after age 65. Withdrawals for non-medical expenses before age 65 are subject to income tax plus a 20% penalty. After 65, non-medical withdrawals are taxed as ordinary income with no penalty, just like a traditional IRA.
Can self-employed people use an FSA?
No. FSAs are employer-sponsored benefits. Self-employed individuals without employees are not eligible for a healthcare FSA. The HSA (paired with an HDHP) is the primary tax-advantaged medical savings option available to the self-employed.
Do HSA funds expire?
No. Unlike an FSA, HSA funds roll over from year to year with no limit. The account is yours regardless of employment status, and unused funds can be invested and grow indefinitely.
Bottom line: if you qualify for an HSA, it is almost always the superior account — it rolls over, can be invested, and travels with you regardless of employer. The FSA is the right tool if you are not in an HDHP, you have predictable near-term medical costs, or your employer contributes to it. When you can, pair the HSA with a limited-purpose FSA to pre-tax both your medical costs and your dental and vision spending.
This article is for educational and informational purposes only and does not constitute financial or tax advice. HSA and FSA contribution limits, rollover rules, and eligible expenses are set by the IRS and change annually. Verify current limits at irs.gov and review IRS Publication 502 for the full list of qualified medical expenses. Consult a tax professional for guidance on your specific situation.
