HSA Calculator

Understanding the HSA Calculator

A Health Savings Account (HSA) is one of the most tax-efficient accounts available, and this calculator shows why. Enter your current HSA balance, planned annual contribution, an expected investment return, the number of years you will let it grow, and your marginal tax rate. The tool projects your future balance, separates how much came from your own contributions versus investment growth, and estimates the income tax you save by contributing pre-tax dollars. Because qualified medical withdrawals are also tax-free, an HSA can double as a stealth retirement account, making it a powerful long-term savings vehicle for anyone enrolled in a high-deductible health plan.

How it works

The calculator compounds your money once per year. Each year it grows the existing balance by your expected return rate, then adds that year's contribution on top. Repeating this for the number of years you choose gives the projected ending balance. Total contributed is simply your starting balance plus all the annual contributions you make. Investment growth is the difference between the projected balance and the total contributed, isolating the gains earned by your invested funds. The estimated tax saved multiplies each annual contribution by your marginal tax rate and by the number of years, since HSA contributions are deducted from taxable income before tax is applied.

Tips & common mistakes

• Contribute up to the 2024 IRS limits to maximize the benefit: $4,150 self-only or $8,300 family, plus a $1,000 catch-up if you are 55 or older.
• If your provider allows it, invest the balance above the required cash minimum so it can compound rather than sitting in low-interest cash.
• Pay smaller current medical bills out of pocket when you can, and let the HSA grow untouched for larger future or retirement healthcare costs.
• Save your medical receipts: you can reimburse yourself tax-free years later for past qualified expenses paid out of pocket.
• Use a realistic long-term return assumption (often 5 to 8 percent) rather than a single great year, and revisit the projection annually as limits and balances change.
• Remember non-qualified withdrawals before age 65 are taxed and hit with a 20% penalty, so keep HSA spending tied to qualified medical expenses.

Sources & methodology

• • IRS Publication 969 and Revenue Procedure 2023-23 — 2024 HSA contribution limits ($4,150 self-only, $8,300 family, $1,000 age-55+ catch-up).
• • IRS rules on qualified medical expenses and HSA tax treatment (pre-tax contributions, tax-free growth, tax-free qualified withdrawals).

Related tools