What is the HSA triple tax advantage?

Three layers: contributions reduce taxable income going in, investment growth inside the account is never taxed, and withdrawals are tax-free when spent on qualified medical expenses. No other account offers all three; a 401(k) taxes withdrawals and a Roth taxes contributions.

How much can I put in an HSA in 2026?

For 2026 the IRS limits are $4,400 with self-only coverage and $8,750 with family coverage (Rev. Proc. 2025-19), plus a $1,000 catch-up if you are 55 or older. Employer contributions count against the same limit. You need a qualifying high-deductible health plan to contribute at all.

Should I invest my HSA or keep it in cash?

Keep enough cash to cover your deductible, and consider investing the rest if your horizon is long. An HSA left in cash earns almost nothing; invested, the growth compounds tax-free. The common strategy is to pay current medical bills out of pocket, keep the receipts, and let the account grow for retirement health costs.

What happens to my HSA money if I do not spend it?

It rolls over forever; there is no use-it-or-lose-it rule like an FSA. After age 65 you can withdraw for any purpose paying only ordinary income tax, like a traditional IRA, and medical withdrawals stay tax-free. The account is portable across jobs and health plans.

Do HSA contributions reduce Social Security and Medicare tax?

Payroll (Section 125) contributions do: they skip income tax and the 7.65 percent employee FICA. Contributions you make directly and deduct on your return skip income tax only. That FICA edge makes payroll the better route when your employer offers it, and it is on top of the savings shown here.

HSA Calculator

Project an HSA balance with the 2026 limits ($4,400 self-only, $8,750 family): tax savings now, tax-free growth, and the balance at any horizon.

X f in

Projected HSA balance

$116,771.04

2026 contribution limit: $4,400.00
Contribution modeled: $3,000.00
Limit check: Within the 2026 IRS limit
Income tax saved per year: $660.00
Income tax saved over the horizon: $13,200.00
Total contributed: $62,000.00
Tax-free growth: $54,771.04

HSA balance by year

Quick answer: With the example inputs this page loads by default, the headline result (Projected HSA balance) comes to $116,771.04. Project an HSA balance with the 2026 limits ($4,400 self-only, $8,750 family): tax savings now, tax-free growth, and the balance at any horizon. Change any input above and every figure updates instantly in your browser.

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Fact-check: results on this page are verified against an independently coded reference oracle that covers all 106 calculators on this site. See how we verify .

A health savings account is the only account with a triple tax advantage: contributions reduce taxable income, growth is untaxed, and withdrawals for qualified medical costs are tax-free. For 2026 you can contribute up to $4,400 with self-only coverage or $8,750 with family coverage, plus $1,000 at age 55. This calculator projects the balance and the tax saved.

What this result means

Two readings matter. The tax-savings line is immediate and certain: every contributed dollar skips income tax at your marginal rate, and payroll contributions skip Social Security and Medicare too. The projected balance is an estimate that assumes you invest the HSA rather than leaving it in cash, which is where the account earns its reputation as a stealth retirement vehicle: paying today's medical costs out of pocket and letting the HSA compound turns it into tax-free retirement money for future health spending. Eligibility requires a qualifying high-deductible health plan. This is an estimate, not advice.

Assumptions

Contribution limits are the 2026 figures from IRS Rev. Proc. 2025-19: $4,400 for self-only HDHP coverage and $8,750 for family coverage, plus a $1,000 catch-up at age 55 or older. Your entered contribution is clamped to that limit; employer contributions count toward it.
Contributions are made at the end of each year and the balance compounds once a year at the expected return, using the same growth formulas as the site's other savings calculators. A real HSA contributed per paycheck and compounded continuously lands slightly higher.
Income tax savings are the modeled contribution times your marginal rate, held constant. Contributions made through payroll also avoid the 7.65 percent employee FICA, which this calculator does not count, so payroll contributions save more than shown. State treatment varies (California and New Jersey tax HSA contributions).
Growth and qualified withdrawals are modeled as untaxed, per the HSA rules. Non-qualified withdrawals before age 65 owe income tax plus a 20 percent penalty and are not modeled.
Eligibility (a qualifying high-deductible health plan, no other disqualifying coverage, not enrolled in Medicare) is assumed, and the limit is applied as a full-year amount with no proration for partial-year eligibility.
This is an estimate for educational purposes only, not tax, investment, or health-coverage advice.

Key terms

Definitions for the terms this calculator uses, in our finance glossary .

How it works

The calculator models the three layers of the HSA’s tax treatment.

The limit. Your annual contribution is clamped to the 2026 IRS limit from Rev. Proc. 2025-19: $4,400 for self-only HDHP coverage or $8,750 for family coverage, plus a $1,000 catch-up at age 55 or older. Employer contributions count toward the same cap.

Tax savings now. The modeled contribution times your marginal rate is the income tax you skip each year. Contributions made through payroll also avoid the 7.65 percent employee FICA, an extra saving this calculator deliberately leaves out of the figures.

Growth. The balance projects as current balance x (1 + r)^n plus an end-of-year contribution annuity, contribution x ((1 + r)^n - 1) / r, the same shared formulas behind the site’s other savings tools. Growth and qualified medical withdrawals are modeled as untaxed, which is the HSA’s distinguishing rule.

Worked example

Self-only coverage, $3,000 contributed yearly, $2,000 already saved, 20 years at 6 percent, a 22 percent marginal rate.

Growth factor: 1.06^20 = 3.20714.
Lump sum: $2,000 x 3.20714 = $6,414.27.
Contributions: $3,000 x (3.20714 - 1) / 0.06 = $110,356.77.
Projected balance: $116,771.04, of which $54,771.04 is tax-free growth on $62,000 contributed.
Income tax saved: 22% x $3,000 = $660 a year, $13,200 over the horizon.

Scope and limitations

Annual end-of-year contributions and annual compounding at a constant return; real returns vary and per-paycheck contributions compound slightly better. FICA savings on payroll contributions, state taxes (California and New Jersey tax HSA contributions), partial-year eligibility proration, Medicare enrollment rules, and the 20 percent penalty on non-qualified early withdrawals are not modeled. This is an estimate for education, not tax, investment, or health-coverage advice.

Sources

Frequently asked questions

What is the HSA triple tax advantage?: Three layers: contributions reduce taxable income going in, investment growth inside the account is never taxed, and withdrawals are tax-free when spent on qualified medical expenses. No other account offers all three; a 401(k) taxes withdrawals and a Roth taxes contributions.
How much can I put in an HSA in 2026?: For 2026 the IRS limits are $4,400 with self-only coverage and $8,750 with family coverage (Rev. Proc. 2025-19), plus a $1,000 catch-up if you are 55 or older. Employer contributions count against the same limit. You need a qualifying high-deductible health plan to contribute at all.
Should I invest my HSA or keep it in cash?: Keep enough cash to cover your deductible, and consider investing the rest if your horizon is long. An HSA left in cash earns almost nothing; invested, the growth compounds tax-free. The common strategy is to pay current medical bills out of pocket, keep the receipts, and let the account grow for retirement health costs.
What happens to my HSA money if I do not spend it?: It rolls over forever; there is no use-it-or-lose-it rule like an FSA. After age 65 you can withdraw for any purpose paying only ordinary income tax, like a traditional IRA, and medical withdrawals stay tax-free. The account is portable across jobs and health plans.
Do HSA contributions reduce Social Security and Medicare tax?: Payroll (Section 125) contributions do: they skip income tax and the 7.65 percent employee FICA. Contributions you make directly and deduct on your return skip income tax only. That FICA edge makes payroll the better route when your employer offers it, and it is on top of the savings shown here.

Related calculators

Learn how this works

New to this topic? Our companion guide explains it in plain language: 2026 Contribution Limits: What You Can Put Into Your 401(k), IRA, and HSA

By Sam Sage Last reviewed July 2026.