HSA/FSA Contribution Calculator
Tax savings from contributing to an HSA or FSA for medical expenses.
🔒 Runs entirely in your browser — nothing here is ever uploaded
About the HSA/FSA Contribution Calculator
Estimates the income-tax (and optional payroll-tax) savings from contributing to a Health Savings Account (HSA) or Health Care Flexible Spending Account (FSA) to cover expected medical expenses, using the current IRS contribution limits for each account type.
- Choose Account type — HSA or FSA.
- If HSA, select your HDHP coverage (self-only or family) and whether you qualify for the 55+ catch-up contribution.
- Enter your Expected qualifying medical expenses for the year.
- Enter your Planned annual contribution — it's automatically capped at the IRS limit for your account type.
- Enter your Marginal tax rate and whether the contribution is deducted via employer payroll (which also exempts it from FICA tax).
- Read your tax savings and the net cost of this year's expenses in the result panel.
Expected annual qualifying medical expenses of $2,500, contributed through a Health FSA (2026 limit $3,400, so no cap applies), a 22% marginal federal tax rate, and payroll deduction (FICA-exempt): a combined 29.65% rate produces $741.25 in tax savings and a net cost of $1,758.75 for the $2,500 in expenses — versus paying the full $2,500 out of pocket with no tax benefit.
| Account | 2026 limit | Catch-up (55+) | Key rule |
|---|---|---|---|
| HSA — Self-only coverage | $4,400 | +$1,000 | Requires HDHP: min deductible $1,700, max out-of-pocket $8,500 |
| HSA — Family coverage | $8,750 | +$1,000 | Requires HDHP: min deductible $3,400, max out-of-pocket $17,000 |
| Health Care FSA | $3,400 | N/A | Use-it-or-lose-it; max carryover to 2027 is $680 if employer offers it |
Figures reflect the 2026 tax year IRS limits (HSA: Rev. Proc. 2025-19; FSA: Rev. Proc. 2025-32, both confirmed via IRS.gov). This tool uses a simplified combined marginal-rate calculation — it does not model state income tax (which varies, and some states, including California and New Jersey, tax HSA contributions), phase-outs, itemization interactions, or your plan's specific carryover/grace-period rules. An HSA also requires enrollment in an IRS-qualifying High-Deductible Health Plan (HDHP) — contributing to one without qualifying HDHP coverage can trigger tax penalties. An FSA's unused balance is normally forfeited at year-end ('use it or lose it') unless your employer opts into a limited carryover (2026 max $680) or a grace period — never both. Treat all output as a planning estimate, not a tax filing calculation.
- • An HSA's "triple tax advantage" — pre-tax contributions, tax-free growth, and tax-free qualified withdrawals — makes it worth maxing out before an FSA if you're eligible for both, since unused HSA funds never expire.
- • For an FSA, contribute closer to your expected expenses than the IRS max, since unused funds are normally forfeited at year-end unless your employer offers a limited carryover or grace period (never both).
- • Contributing via employer payroll typically exempts the amount from FICA tax too, not just income tax — check your pay stub to confirm your contribution is actually payroll-deducted rather than made directly, since only payroll deductions get that extra exemption.
- Fidelity — HSA contribution limits and eligibility rules for 2026 and 2027 — accessed 2026-08-29
- IRS Newsroom — IRS releases tax inflation adjustments for tax year 2026 (confirms $3,400 Health FSA limit / $680 max carryover) — accessed 2026-08-29
- IRS Rev. Proc. 2025-19 (2026 HSA/HDHP inflation-adjusted amounts, primary source; figures cross-confirmed via Fidelity, KPMG, PSCA secondary reporting since this PDF's text could not be parsed by the fetch tool this session) — accessed 2026-08-29
Illustrative estimate only, not financial or tax advice. Verify figures with a licensed adviser or your local tax authority.