HSA Calculator

Enter your HSA contributions and tax rates to find your projected balance and the full dollar value of its triple tax advantage.

HSA Calculator

Live

Your annual contribution

Employer contribution (optional)

Years until you'll use the funds

Expected annual return (%)

Federal tax rate (%)

State tax rate (%, 0 if none)

Contribution method

Projected HSA balance	$187,165.09
1. Contribution tax savings (over the full period)	$29,799.00
2. Tax-free growth advantage (vs. a taxable account)	$18,580.08
3. Tax-free withdrawal savings	$41,176.32
Total triple tax advantage value	$89,555.40

Assumes your HSA is invested (not left in cash) and withdrawals are used for qualified medical expenses. Taxable-account comparison uses a simplified 15% long-term capital gains rate on annual growth.

The three tax advantages, explained

1. Contribution savings = Your contribution x (Federal rate + State rate + FICA if payroll-deducted) 2. Growth advantage = HSA balance (tax-free compounding) - Equivalent taxable account balance 3. Withdrawal savings = Final HSA balance x Federal tax rate (avoided at withdrawal) Total advantage = Sum of all three

Example

$4,300/year contribution + $500 employer match, 20 years at 6% return, 22% federal + 5% state + FICA: contribution savings ≈ $29,799, growth advantage ≈ $18,580, withdrawal savings ≈ $41,176 - a total triple tax advantage of about $89,555 over the taxable-account alternative.

Step-by-step guide

Enter your annual contribution and any employer contribution.
Enter how many years until you expect to use the funds, and your expected investment return.
Enter your federal and state tax rates.
Choose your contribution method - payroll deduction also avoids FICA tax, direct deposits don't.

Why no other account matches all three advantages at once

A traditional 401(k) or IRA gives you the upfront deduction and tax-free growth, but withdrawals are taxed as ordinary income. A Roth IRA gives you tax-free growth and tax-free withdrawals, but no upfront deduction. The HSA is the only account in the US tax code offering all three simultaneously - money goes in before tax, grows without any tax drag along the way, and comes out tax-free for qualified medical expenses. This is exactly why the "growth advantage" shown here compounds meaningfully over time: every dollar of what would otherwise be investment tax drag in a taxable account instead stays invested and keeps compounding inside the HSA.

Common mistakes

Leaving HSA funds in cash instead of investing them - the tax-free growth advantage only compounds meaningfully if the balance is actually invested, similar to a retirement account.

Forgetting that only your own contribution (not your employer's) generates the upfront tax deduction - employer contributions were never part of your taxable income to begin with.

Confusing HSA rules with FSA rules - unlike an FSA, unused HSA funds never expire and the account stays with you even if you change jobs or health plans.

Frequently asked questions

What if I only had HSA-eligible coverage for part of the year?

Your contribution limit is generally prorated by the number of months you had qualifying high-deductible health plan coverage - 8 months of coverage out of 12, for example, allows roughly two-thirds of the full annual limit. Some exceptions (like the "last-month rule") can allow the full amount in certain situations - check current IRS guidance for your specific case.

Do I need a high-deductible health plan to have an HSA?

Yes - HSA eligibility requires enrollment in a qualifying high-deductible health plan (HDHP), with specific minimum deductible and maximum out-of-pocket limits set by the IRS each year.

What happens to unused HSA funds?

They roll over indefinitely and remain yours even if you change employers or health plans, unlike a Flexible Spending Account (FSA) where unused funds often expire at year-end.

Related calculators

See the full list of Financial calculators, or try: