HSA Tax Savings Calculator
Calculate the tax savings from a Health Savings Account contribution and see the triple tax advantage in dollars.
The HSA is the only account in the US tax code with a triple tax advantage: contributions are pre-tax, growth is tax-free, and withdrawals for qualified medical expenses are tax-free. No other account — not a 401k, not a Roth IRA — offers all three. For people who can afford to pay current medical expenses out of pocket and let the HSA grow, it functions as a stealth retirement account that is tax-free on all sides.
Triple tax advantage: (1) contributions reduce taxable income, (2) investments grow tax-free, (3) withdrawals for qualified medical expenses are never taxed. After age 65, non-medical withdrawals are taxed as ordinary income — making it behave like a Traditional IRA with the medical expense exemption on top.
The FICA advantage that most people miss
When HSA contributions are made through payroll deduction (the most common method), they avoid FICA taxes (Social Security 6.2% + Medicare 1.45% = 7.65%) in addition to federal and state income taxes. A $4,300 HSA contribution through payroll saves $329 in FICA taxes on top of the income tax savings. This advantage is not available when contributing directly to an HSA outside of payroll.
The investment strategy
Most people use their HSA as a medical expense slush fund, spending it down each year. The superior strategy, for those who can afford it: invest the HSA in low-cost index funds, pay current medical expenses out of pocket, save every receipt, and let the account grow tax-free for decades. At retirement, you can reimburse yourself for any medical expense you paid out of pocket at any point in the past — tax-free. There is no time limit on reimbursements, so a $200 dentist bill from 2025 can be reimbursed tax-free in 2045.
Frequently asked questions
What qualifies as an HSA-eligible health plan?
A High Deductible Health Plan (HDHP). For 2025: minimum deductible of $1,650 (individual) or $3,300 (family), maximum out-of-pocket of $8,300 (individual) or $16,600 (family). Check your plan documents — not all high-deductible plans qualify as HDHPs for HSA purposes.
Can I invest my HSA?
Yes, if your HSA provider offers investment options. Fidelity, Lively, and HealthEquity are commonly recommended for their low fees and broad investment menus. Many employer-sponsored HSAs have limited or poor investment options — you can transfer your HSA to a better provider without penalty.