Calculate your tax savings from HSA and FSA contributions — triple tax benefit: federal + FICA + state.
Tax savings are estimates. The federal rate is your marginal bracket from the 2026 IRS tables after the standard deduction. FICA savings (7.65%) assume contributions are made through employer payroll (Section 125 cafeteria plan); contributions deducted on your 1040 instead do not avoid FICA. Your actual savings depend on your state's HSA/FSA tax treatment and eligibility. HSA requires a High Deductible Health Plan (HDHP). This is not tax advice.
Both accounts are funded with pre-tax dollars, so each contribution dodges three separate taxes: federal income tax, FICA (Social Security + Medicare at 7.65%), and state income tax. That is the triple tax advantage. Where they diverge is what happens on 31 December: a health FSA is use it or lose it — unused money is forfeited to the employer — while an HSA balance rolls over indefinitely, can be invested, and becomes a retirement account after age 65. This calculator takes your income, subtracts the 2026 standard deduction ($16,100 single / $32,200 married), looks up your marginal federal bracket in the 2026 IRS tables, and applies that rate plus 7.65% FICA plus your state rate to every dollar you contribute, capping each contribution at the 2026 IRS limit: $4,400 self-only HSA, $8,750 family HSA, $1,000 catch-up at 55+, and $3,400 for the health FSA.
Top: each contributed dollar avoids federal + FICA + state tax — 32.65% at a 22% bracket and a 5% state rate. Bottom: the FSA column is clipped at the contribution amount every December 31 (the red slice is forfeited), while the HSA column carries the unspent balance forward and stacks year after year.
Dan is 42, files single, earns $85,000, and lives in a state with a 5% flat income tax. He has a self-only HDHP and is deciding how much to route through pre-tax health accounts this year.
Calculate triple tax savings from HSA and FSA contributions. Federal + FICA + state savings. 2026 limits: HSA $4,400/$8,750, FSA $3,400. Free.
This calculator quantifies the tax savings from HSA and FSA contributions across all three tax layers: federal income tax, FICA payroll tax, and state income tax where applicable. Enter your contribution amount, marginal federal bracket, state, and whether FICA applies to you, and the tool returns total annual savings, effective return on the contributed dollars, and a comparison view of HSA versus FSA on the dimensions that matter — rollover, investment growth, and portability. 2026 limits are built in: $4,400 individual / $8,750 family for HSA, $3,400 for FSA, so over-contribution mistakes surface immediately.
Employees deciding annual election amounts during open enrollment see what each contribution dollar actually saves at their bracket. High-deductible plan holders evaluating HSA-as-investment — contributions grow tax-free and roll over forever, unlike use-it-or-lose-it FSAs — get the projected triple-tax advantage in dollars. Households weighing HSA versus FSA eligibility (HSAs require HDHP enrollment; FSAs do not) compare on rollover and portability. Self-employed HSA-eligible filers see the federal and state savings stack, noting FICA does not apply to them.
(1) Enter your planned annual contribution and confirm the 2026 limit for your account type and coverage tier. (2) Set your marginal federal bracket and state — California and New Jersey tax HSA contributions at the state level, which the tool applies. (3) Toggle FICA applicability: employees save 7.65% payroll tax on both account types; the self-employed do not. (4) Read total annual tax savings, savings per contribution dollar, and the HSA-versus-FSA comparison including rollover rules and investment growth projections for HSA balances held long-term.
The accounts differ on four axes that decide everything. Eligibility: HSA requires enrollment in a qualifying high-deductible health plan; FSA requires only an employer offering it. Rollover: HSA balances roll over indefinitely and are yours forever, even through job changes; FSA funds are use-it-or-lose-it subject to small grace-period or carryover carve-outs employers may adopt. Growth: HSA funds can be invested and compound tax-free — the only account in the tax code that is deductible going in, untaxed growing, and untaxed coming out for qualified medical expenses; FSA balances earn nothing. Limits (2026): HSA $4,400 individual / $8,750 family plus $1,000 catch-up at 55+; FSA $3,400 per employer. The dominant strategy when eligible: max the HSA and treat it as a retirement account for medical costs if cash flow allows, paying current expenses out of pocket while keeping receipts — qualified withdrawals can be made any later year. Use the FSA for predictable near-term expenses when the HSA is unavailable, sizing elections conservatively to avoid forfeiture.
2026 HSA limits: $4,400 for self-only coverage, $8,750 for family coverage (up from $4,300/$8,550 in 2025). 2026 FSA limit: $3,400 (up from $3,300). HSA contributions are triple tax-advantaged: deductible on federal taxes, tax-free growth, and tax-free withdrawals for qualified medical expenses.
HSA is superior if you have a qualifying high-deductible health plan (HDHP): contributions roll over annually, the account is portable (follows you job-to-job), and it can be invested for long-term growth. FSA is use-it-or-lose-it (with a $660 carryover allowed for 2026) and is tied to your employer. This calculator shows exact tax savings for each.
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