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Comparison · Tax

HSA vs FSA

HSAs are the most tax-advantaged account in the US tax code — triple tax-free (deductible going in, growth tax-free, withdrawals tax-free for medical). FSAs are use-it-or-lose-it spending accounts, useful but far less powerful. You qualify for an HSA only if you have a high-deductible health plan (HDHP).

Factor HSA FSA
Eligibility HDHP enrollment required Any employer-sponsored plan
2026 contribution limit (self) $4,400 $3,300
2026 contribution limit (family) $8,750 $3,300 (per employee)
Rollover All balance rolls forever Use by year-end (some grace/$640 carryover)
Investment option Yes, balance can be invested in funds No — cash only
Portability Goes with you when you change jobs Forfeited if unused at job change
Tax benefits Triple: deduction + growth + withdrawal Single: pre-tax deduction only

Choose HSA when…

You enrolled in an HDHP. Always max the HSA before any other tax-advantaged account — it beats 401(k) and IRA on tax math. Use it as a stealth retirement account: invest the balance, pay current medical bills out of pocket, save receipts to reimburse yourself tax-free decades later.

Choose FSA when…

You don't have an HDHP (so no HSA option) and have predictable annual medical costs (kids in braces, planned procedures, contact lenses) that you can pay for with pre-tax dollars. Calculate next year's expected medical spend and contribute exactly that.

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Frequently asked questions

Can I have both an HSA and FSA?

Yes, but only a "limited-purpose FSA" (dental and vision only) alongside an HSA. You cannot have a general-purpose FSA and an HSA in the same year.

What happens to my HSA if I never use it for medical?

After age 65, you can withdraw HSA funds for any reason, paying only ordinary income tax (no penalty) — same as a Traditional IRA. So a healthy HSA effectively becomes a bonus retirement account if you stay healthy.

Is an HDHP plan worth it just to get the HSA?

Depends. Compare total annual cost (premium + expected out-of-pocket) for an HDHP vs PPO/HMO. If the HDHP saves you $1,500/yr in premiums and your max out-of-pocket is $3,000 higher, the HSA tax savings (~$1,000+ at 24% bracket) often tips the math toward HDHP for healthy single people.

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