HSA Calculator

The HSA Calculator projects the long-term growth of your Health Savings Account (HSA) and puts a dollar value on its famous triple tax advantage. Enter your contributions, employer match, expected return, and tax rate, and the tool shows your projected balance at retirement, an animated chart comparing your HSA against an ordinary taxable account, and a clear breakdown of how much you save from the upfront deduction, tax-free growth, and tax-free withdrawals. It also checks your contributions against the current IRS limits, including the age-55 catch-up.

What is an HSA?

A Health Savings Account is a tax-advantaged savings account available to people enrolled in a qualifying high-deductible health plan (HDHP). You contribute money before tax, you can invest the balance so it grows over time, and you withdraw it tax-free to pay for qualified medical expenses. Unlike a flexible spending account (FSA), HSA funds never expire — the balance rolls over year after year and stays with you when you change jobs or retire.

The HSA Triple Tax Advantage

An HSA is the only account that offers three distinct tax breaks at the same time, which is what makes it such a powerful long-term wealth-building tool:

• 1. Tax-deductible contributions. Money you put in lowers your taxable income today (or goes in pre-tax through payroll, which also avoids FICA taxes).
• 2. Tax-free growth. Interest, dividends, and capital gains inside the account are never taxed — your balance compounds faster than in a taxable brokerage account.
• 3. Tax-free withdrawals. Money taken out for qualified medical expenses is completely tax-free, at any age.

HSA Growth Formula

This calculator projects your balance using the future value of your current balance plus a series of annual contributions that grow at your expected rate of return:

Where \(P_0\) is your current balance, \(C\) is your total annual contribution (yours plus your employer's), \(r\) is your expected annual return, and \(n\) is the number of years until you start using the funds. To value the second tax benefit, the tool also models an identical taxable account whose return is reduced to \(r \times (1 - \text{tax rate})\) because its gains are taxed each year — the gap between the two ending balances is the dollar value of tax-free compounding.

2026 HSA Contribution Limits

Employer contributions count toward these limits. To be eligible to contribute, your health plan must qualify as an HDHP: for 2026 that means a minimum deductible of $1,700 (self-only) or $3,400 (family), with annual out-of-pocket maximums of $8,500 and $17,000 respectively.

Why Invest Your HSA for the Long Term?

How to Use This Calculator

1. Choose your coverage and ages: Select Self-only or Family HDHP coverage, then enter your current age and the age you plan to start drawing on the funds.
2. Enter contributions and balance: Add your current HSA balance, your annual contribution, and any employer contribution.
3. Set return and tax rate: Enter your expected annual investment return and your marginal income tax rate so the tool can value the tax savings.
4. Review your projection: See your projected balance, the animated HSA-versus-taxable chart, the dollar value of all three tax benefits, your contributions-versus-growth split, and an IRS limit check.

Frequently Asked Questions

What is an HSA?

A Health Savings Account (HSA) is a tax-advantaged account you can use with a qualifying high-deductible health plan (HDHP). You contribute pre-tax money, the balance can be invested and grows tax-free, and withdrawals for qualified medical expenses are tax-free. Unused funds roll over every year and are yours to keep, even if you change jobs or health plans.

Why is an HSA called triple tax-advantaged?

An HSA offers three separate tax benefits. First, contributions are tax-deductible (or pre-tax through payroll), lowering your taxable income today. Second, investment growth inside the account is never taxed. Third, withdrawals for qualified medical expenses are completely tax-free. No other account combines all three benefits, which is why an HSA can be a powerful long-term savings vehicle.

What are the 2026 HSA contribution limits?

For 2026 the IRS limit is $4,400 for self-only HDHP coverage and $8,750 for family coverage. If you are age 55 or older, you can contribute an additional $1,000 catch-up amount. Employer contributions count toward these limits.

Can I invest my HSA balance?

Many HSA providers let you invest the balance above a small cash threshold in mutual funds or ETFs, just like a 401(k) or IRA. Because the growth is tax-free, investing an HSA for the long term and paying current medical bills out of pocket can significantly increase its value by retirement.

What happens to my HSA at age 65?

After age 65 you can withdraw HSA funds for any purpose without the 20% penalty. Withdrawals for non-medical expenses are taxed as ordinary income, similar to a traditional IRA, while withdrawals for qualified medical expenses remain tax-free. This makes an HSA function as a flexible supplemental retirement account.

Do employer contributions count toward the limit?

Yes. Any money your employer contributes to your HSA counts toward the annual IRS contribution limit. This calculator adds your contribution and your employer contribution together and compares the total against the limit for your coverage type and age.

Additional Resources

• Health Savings Account - Wikipedia
• IRS Publication 969 - Health Savings Accounts