HSA vs FSA Calculator 2026 — Which Health Account Saves You More?

HSA vs FSA: The Key Differences

A Health Savings Account (HSA) and a Health Flexible Spending Account (FSA) are both tax-advantaged accounts for medical expenses — but they work very differently. The biggest distinction: an HSA requires a qualifying High-Deductible Health Plan (HDHP), while a Health FSA is available with any employer-sponsored plan. Beyond that, the HSA wins on almost every dimension: higher contribution limits (especially for families), unlimited rollover, portability, and the ability to invest and grow the balance tax-free. The FSA's main advantage is availability — if you're not on an HDHP, it may be your only pre-tax option.

2026 Contribution Limits

HSA (self-only HDHP): $4,400. HSA (family HDHP): $8,750. HSA catch-up (age 55+): +$1,000 per eligible account holder. Health FSA: $3,400. FSA carryover maximum: $680 (employer may allow up to this amount to roll to the next year; anything above is forfeited).

These limits are set by the IRS and adjusted for inflation annually. The HSA family limit is more than double the FSA limit, making the HSA the clear winner for families on an HDHP who want to maximize their pre-tax medical savings.

When an FSA Makes More Sense

Despite the HSA's advantages, a Health FSA can be the better choice in specific circumstances:

• You're not eligible for an HDHP — either because your employer doesn't offer one, or your health situation requires a richer plan with lower deductibles.
• You have known, predictable high medical expenses this year and you'll spend the FSA balance before year-end. The FSA's "use-it-or-lose-it" rule is less of a concern if you'll use all of it.
• Your employer contributes to your FSA but not to an HSA, making the FSA more valuable net of employer funding.

Can You Have Both?

Generally, you cannot contribute to both a general-purpose Health FSA and an HSA at the same time — the FSA is treated as "other coverage" that disqualifies you from HSA contributions. However, there is an important exception: a Limited-Purpose FSA (LPFSA) — restricted to dental and vision expenses only — can be held alongside an HSA. This lets you keep your HSA for long-term growth and tax-free investment while using a Limited-Purpose FSA for predictable dental and vision costs. Ask your employer's benefits administrator whether they offer an LPFSA option.

Frequently Asked Questions

• What is the HSA contribution limit for 2026?
  For 2026, the IRS HSA contribution limit is $4,400 for self-only HDHP coverage and $8,750 for family coverage. Individuals aged 55 or older may contribute an additional $1,000 catch-up contribution. These limits apply to the combined total of your contributions and any employer contributions.
• What is the FSA limit for 2026?
  The 2026 Health FSA contribution limit is $3,400 per year. Employers may allow a carryover of up to $680 to the following plan year; any amount above the carryover is forfeited. Some employers offer a grace period of 2.5 months instead of the carryover option — check your plan documents.
• Do HSA funds expire?
  No. HSA funds never expire. Unlike an FSA, your HSA balance rolls over year after year with no deadline to spend it. You can let the balance grow and invest it for decades. This is one of the HSA's most powerful features — it functions as a stealth retirement account for healthcare costs.
• What is a High-Deductible Health Plan (HDHP)?
  For 2026, a qualifying HDHP must have a minimum annual deductible of $1,650 (self-only) or $3,300 (family), and out-of-pocket maximums of no more than $8,300 (self-only) or $16,600 (family). If your plan meets these thresholds, you are eligible to open and contribute to an HSA — provided you are not also covered by Medicare or a general-purpose FSA.
• Can I use an HSA after I leave my employer?
  Yes. Your HSA is yours permanently. If you change jobs, retire, or lose HSA eligibility (e.g., move off an HDHP), you cannot make new contributions — but your existing balance remains yours. You can still invest it, let it grow, and withdraw tax-free for qualified medical expenses at any time. After age 65, you can withdraw for any reason (paying ordinary income tax, as with a traditional IRA).
• What happens to FSA funds if I leave my job?
  Unlike an HSA, the Health FSA is employer-owned. If you leave your employer mid-year, you typically forfeit any remaining FSA balance (unless COBRA applies). One partial protection: if you've contributed more than you've spent, you lose the excess. However, the FSA's "uniform coverage rule" means your full annual election is available from day one of the plan year — so you could theoretically spend all elected funds early and leave, keeping the pre-tax benefit.
• Is the calculator's tax savings estimate accurate?
  The calculator uses your entered marginal tax rate to estimate tax savings on the contribution. Actual savings depend on your complete tax picture, including deductions, credits, and whether contributions are made via payroll (which also saves FICA taxes) or directly. This is an estimate only. Consult a tax professional for your specific situation.

Disclaimer: Estimates only — not tax advice. Contribution rules and eligibility depend on your specific plan; consult your benefits administrator or a tax professional.