HSA Tax Savings Calculator (2026)
See what an HSA contribution saves in federal income tax and FICA this year, and the real cost of the contribution after those savings.
How it's calculated
An HSA is the only account with a triple tax advantage. Your contribution is deducted from your income, the money grows tax-free, and withdrawals for qualified medical costs come out tax-free too. This calculator focuses on the first of those, the tax you save the year you contribute.
Take the default. A $4,400 contribution for a single filer with $100,000 of taxable income lands in the 22 percent bracket, so it cuts federal income tax by $968. Made through payroll, it also skips the 7.65 percent FICA tax, saving another $336.60. Together that is $1,304.60, so your $4,400 contribution really costs you $3,095.40. The government covers close to 30 percent.
The savings grow with your bracket, so higher earners benefit more. Above the Social Security wage base the payroll savings drop to the 1.45 percent Medicare portion, since Social Security is already fully taxed. And this is only year one. Invested and left to grow, the same dollars come out tax-free for medical costs later, which is why many people treat the HSA as a stealth retirement account.
Assumptions
- Income tax saved is your contribution times your marginal federal bracket. FICA saved applies only to payroll contributions, at 7.65 percent up to the Social Security wage base and 1.45 percent above it. — IRS 2026 brackets, SSA wage base
- State tax and the tax-free growth over time are not included here. This is the first-year federal saving only.
Last updated: 2026-08-08 · Tax year 2026
These assumptions follow our general methodology.
Frequently asked questions
What is the HSA contribution limit for 2026?
It is $4,400 for self-only coverage and $8,750 for family coverage, with an extra $1,000 if you are 55 or older. You need a qualifying high-deductible health plan to contribute.
Why is an HSA called triple tax advantaged?
Because it avoids tax at all three usual points. Contributions are deducted, growth is not taxed, and qualified medical withdrawals are tax-free. No other account does all three.
Do I save FICA on HSA contributions?
Only if you contribute through your employer payroll. Those contributions skip the 7.65 percent Social Security and Medicare tax as well as income tax. Contributions you make on your own are deductible for income tax but not FICA.
Can I invest my HSA?
Yes, most providers let you invest the balance above a small cash minimum. Left to grow and used for medical costs later, it becomes a powerful long-term account, since the growth is never taxed. The IRA Growth calculator shows how tax-advantaged compounding adds up.
What if I use the money for non-medical costs?
Before age 65 a non-medical withdrawal is taxed as income plus a 20 percent penalty. After 65 the penalty goes away and it works like a Traditional IRA, taxed as income but with no penalty.