How much more can an HSA save than an FSA in 2026?

An HSA's 2026 limit is $4,400 self-only or $8,750 family, versus the FSA's $3,350. At a 24% marginal rate a family maxing an HSA shelters $8,750 and saves $2,769 (24% income tax plus 7.65% FICA when contributed by payroll), while a maxed FSA shelters only $3,350 and saves $1,060.

Do both accounts avoid FICA taxes?

Yes when funded through payroll deduction. Both HSA and FSA payroll contributions escape the 7.65% FICA (6.2% Social Security + 1.45% Medicare), so a $3,350 contribution avoids about $256 of FICA in addition to income tax.

What is the HSA triple tax advantage?

HSA dollars are deductible going in, grow tax-free while invested, and come out tax-free for qualified medical expenses. An FSA only gives the first benefit and has no investment growth, so over years the HSA's edge compounds well past the headline tax saving.

What happens to unused FSA money?

FSAs are use-it-or-lose-it: balances left at year end (beyond a small carryover or grace period your employer may allow) are forfeited. HSA balances roll over indefinitely and are yours to keep, which is why the calculator flags FSA forfeiture risk as a note.

HSA vs FSA Calculator

Compare HSA and FSA tax savings

A Health Savings Account (HSA) and a Flexible Spending Account (FSA) both let you pay for medical costs with pre-tax dollars, but they are not equal. This calculator compares the 2026 tax savings of each so you can see how much further an HSA goes, both on this year’s taxes and over the long run.

How it works

For a pre-tax contribution, the income tax you avoid equals the contribution times your marginal rate. When the money is set aside through payroll, you also avoid the 7.65% FICA payroll tax (6.2% Social Security + 1.45% Medicare).

income tax saved = contribution * marginalRate
FICA saved       = contribution * 0.0765
total saved      = income tax saved + FICA saved

The 2026 HSA limit is $4,400 self-only or $8,750 family, with an extra $1,000 catch-up at age 55 and over. The FSA limit is $3,350, and FSA dollars are use-it-or-lose-it. Because the HSA also grows tax-free and comes out tax-free for medical expenses, it carries a triple tax advantage the FSA cannot match.

Example

A family at a 24% marginal rate maxes a family HSA of $8,750 through payroll. Income tax saved is 8,750 times 0.24, or $2,100. FICA saved is 8,750 times 0.0765, or $669. Total first-year saving is $2,769. A maxed FSA shelters only $3,350: income tax saved of $804 plus FICA of $256, for $1,060 total. The HSA saves about $1,709 more this year alone, before counting tax-free growth.

Notes

This is an estimate, not tax advice. FICA savings assume payroll-deduction contributions; direct HSA contributions are still income-tax deductible but do not avoid FICA. Contribution limits, the $1,000 catch-up, and FSA carryover rules follow IRS guidance for 2026; confirm your exact numbers with the IRS or a tax professional.

HSA vs FSA Calculator

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Compare HSA and FSA tax savings

How it works

Example

Notes