HSA vs FSA Calculator 2026

HSA vs FSA: What's the Difference?

An HSA (Health Savings Account) is a tax-advantaged account only available to people enrolled in a High-Deductible Health Plan (HDHP). For 2026, the IRS contribution limits are $4,300 for self-only coverage and $8,550 for family coverage. An FSA (Flexible Spending Account) can be offered with any employer health plan, with a 2026 limit of $3,300. Both reduce your taxable income, but HSAs offer three distinct tax advantages: contributions are pre-tax, growth is tax-free, and qualified withdrawals are tax-free — the "triple tax advantage."

The most significant practical difference is the rollover rule. FSA funds typically expire at year end (employers may allow a $660 carry-over or a 2.5-month grace period for 2026). HSA balances roll over indefinitely and can be invested in mutual funds or ETFs, making the HSA a powerful long-term healthcare savings vehicle used by many Americans as a "stealth IRA."

2026 HSA and FSA Contribution Limits

The IRS sets annual inflation-adjusted limits for both accounts. For 2026: HSA self-only is $4,300 (up $100 from 2025), HSA family is $8,550 (up $200 from 2025), and the FSA limit is $3,300 (up $100 from 2025). To qualify for an HSA in 2026, your HDHP must have a minimum deductible of $1,650 (self) or $3,300 (family) and a maximum out-of-pocket of $8,300 (self) or $16,600 (family).

Who Should Choose an HSA vs FSA?

Choose an HSA if: you are enrolled in an HDHP, you are generally healthy with predictable low medical costs, you want to invest unused funds for tax-free long-term growth, or you are building a healthcare nest egg for retirement (after age 65, HSA funds can be used for any purpose, not just medical). Choose an FSA if: you are not eligible for an HDHP (or prefer a lower-deductible plan), you have predictable high medical expenses each year that you will definitely spend, or your employer does not offer an HDHP option. Note: you cannot have both an HSA and a general-purpose FSA simultaneously.

FICA Tax Savings — an Often-Missed Benefit

Both HSA and FSA contributions made through payroll deduction reduce your FICA (Social Security + Medicare) taxable wages, saving an additional 7.65% on top of income tax savings. On a $3,000 FSA contribution, that's an extra $230 in FICA savings most people don't account for. This calculator includes FICA savings in the total, which is why the real savings are often 30-40% higher than just the income tax rate suggests.