HSA Contribution Calculator
Determine the optimal HSA contribution based on your expected medical expenses, tax bracket, and contribution limits.
About this calculator
A Health Savings Account is triple tax-advantaged -- contributions reduce taxable income, growth is tax-free, and withdrawals for qualified medical expenses are never taxed -- which makes the sizing question worth getting right. Maximum Allowed comes from the current IRS annual limit for your Coverage Type (self-only or family), plus an additional catch-up amount if you're 55 or older, minus whatever your employer already contributes on your behalf. Recommended Contribution targets your Expected Annual Medical Expenses plus a 20% buffer for the unexpected, but never recommends less than half of your remaining contribution room -- since unused HSA balances roll over indefinitely and keep growing tax-free, there's rarely a reason to contribute far below your limit if you can afford to save more.
Income Tax Savings is your contribution multiplied by your marginal tax bracket, and FICA Tax Savings adds a further 7.65% -- but that FICA savings only applies when contributions flow through payroll as pretax payroll deductions under a Section 125 cafeteria plan; contributing directly and deducting on your own return still reduces income tax but does not reduce FICA, since that income was already taxed for Social Security and Medicare when you earned it. The statutory contribution limits behind Maximum Allowed change annually and are cited in the reference footnote below -- verify the current year's limits directly with the IRS before making a final contribution decision.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Tax Disclaimer
This calculator provides estimates based on general tax rules and may not reflect your specific situation. Tax laws vary by jurisdiction and change frequently. Consult a qualified tax professional or CPA for advice tailored to your circumstances.
Inputs
Results
Recommended Contribution
$3,100.00
Total Tax Savings
$919.15
≈ 7 pairs of sneakers
Figures current as of 2026. Sources: Rev. Proc. 2025-19, IRC § 223(b)(3)(B)
How to Use This Calculator
- Select your coverage type (Self-only or Family) and enter your age -- turning 55 or older unlocks the IRS catch-up contribution.
- The calculator displays the IRS annual HSA contribution limit (Maximum Allowed) for your coverage type and age.
- Enter your employer's HSA contribution (if any) to see your remaining contribution room, and your Expected Annual Medical Expenses so Recommended Contribution can target your actual spending plus a buffer.
- Enter your Marginal Tax Bracket so the calculator can estimate Income Tax Savings and Total Tax Savings.
- Review Recommended Contribution, Monthly Contribution, and Effective After-Tax Cost.
- Remember that HSA contributions must be made with a qualifying High-Deductible Health Plan (HDHP).
- FICA Tax Savings assumes contributions are made through payroll pretax deduction (a Section 125 cafeteria plan) — contributions you make directly and deduct on your own tax return still cut your income tax but do not reduce FICA.
How the result changes with Expected Annual Medical Expenses
| Expected Annual Medical Expenses | Recommended Contribution | Total Tax Savings |
|---|---|---|
| $1,500.00 | $1,950.00 | $578.17 |
| $2,250.00 | $2,200.00 | $652.30 |
| $4,500.00 | $3,900.00 | $1,156.35 |
| $7,500.00 | $3,900.00 | $1,156.35 |
What each input means
- Expected Annual Medical Expenses
- Your anticipated out-of-pocket medical costs this year.
- Marginal Tax Bracket
- Your federal marginal income tax rate (10%, 12%, 22%, 24%, 32%, 35%, or 37%).
- Coverage Type
- Your HDHP coverage tier determines which IRS contribution limit applies.
- Your Age
- Age 55+ qualifies for a $1,000 catch-up contribution.
- Employer HSA Contribution
- Annual amount your employer contributes to your HSA.
How this is calculated
Worked example, using the default values
- Identify Input Parameters5 parametersExpected Annual Medical Expenses = 3000, Marginal Tax Bracket = 22, Coverage Type = Individual (Self-Only), Your Age = 35, Employer HSA Contribution = 500 = 5 input(s) provided
- Calculate Recommended ContributionRecommended Contribution3100 = $3,100
- Calculate Total Tax SavingsTotal Tax Savings919.15 = $919.15
- Calculate Monthly ContributionMonthly Contribution = round((optimalContribution / 12) * 100) / 100258.33 = $258.33
- Calculate Maximum AllowedMaximum Allowed4400 = $4,400
Figures and sources
- 2026 HSA self-only contribution limit (2026) — Rev. Proc. 2025-19
- 2026 HSA catch-up contribution (2026) — IRC § 223(b)(3)(B)
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Does FICA Tax Savings apply no matter how I contribute to my HSA?
No -- it only applies to contributions made through payroll as pretax deductions under a Section 125 cafeteria plan, which is how most employer-sponsored HSA contributions work. If you instead contribute directly to your HSA (for example by transferring from a personal bank account) and claim the deduction on your own tax return, you still reduce your income tax, but that money was already subject to Social Security and Medicare withholding when you earned it, so there's no FICA savings on those contributions.
Why doesn't the calculator ever recommend contributing much less than the maximum?
Recommended Contribution is floored at half of your remaining contribution room (Maximum Allowed minus Employer HSA Contribution), even when your Expected Annual Medical Expenses are low. Unlike a Flexible Spending Account, HSA balances roll over indefinitely and keep growing tax-free with no "use it or lose it" deadline, so contributing well beyond your near-term medical spending is often still the right call if your budget allows it -- the model reflects that HSAs are a strong long-term savings vehicle, not just a medical-expense reimbursement account.
Why does the catch-up contribution only apply at age 55, and not 50 like many retirement accounts?
The IRS sets HSA catch-up eligibility at age 55, which is a different threshold than the age-50 catch-up commonly seen for 401(k) and IRA accounts -- the two systems have separate statutory rules under different sections of the tax code, so a 52-year-old gets a 401(k) catch-up but not yet an HSA one. Once you turn 55, the catch-up amount adds on top of your regular self-only or family limit regardless of coverage type.
What happens to unused HSA funds if my medical expenses end up lower than expected?
Nothing forces you to spend them -- unlike an FSA, an HSA has no year-end forfeiture, so any contribution beyond what you actually spend simply stays invested and continues growing tax-free for future medical expenses, including in retirement. After age 65, you can also withdraw HSA funds for non-medical purposes without the usual penalty (you'll owe ordinary income tax on that portion, similar to a traditional IRA), which is part of why maximizing contributions is often worthwhile even if a given year's expenses come in lower than planned.
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