HSA Savings Calculator

A Health Savings Account (HSA) is a triple-tax-advantaged savings account available to individuals enrolled in a High Deductible Health Plan (HDHP). It is widely considered one of the most powerful tax-advantaged accounts available in the United States.

The triple tax advantage:

1. Tax-deductible contributions. Contributions reduce your taxable income.
2. Tax-free growth. Investment earnings are never taxed.
3. Tax-free withdrawals. Money taken out for qualified medical expenses is tax-free.

No other account in the US tax code offers all three at once. A 401(k) taxes you on the way out; a Roth taxes you on the way in. The HSA does neither.

Annual contribution limits (2025 figures):

• Individual coverage: $4,300
• Family coverage: $8,550
• Catch-up contribution (age 55+): an extra $1,000

These are indexed to inflation and rise most years, so check the current figure before maxing out. The calculator flags an entry above the family limit, since contributing over the cap triggers a 6% excise tax for every year the excess stays in the account.

How the calculation works: The calculator projects your HSA balance using compound growth:

Future Value = Current Balance × (1 + r)^n + Annual Contribution × [((1 + r)^n - 1) / r]

Tax savings are calculated as: Annual Tax Savings = Annual Contribution × (Federal Tax Rate + State Tax Rate + FICA Rate)

The FICA saving of 7.65% applies only to contributions made by payroll deduction through an employer’s cafeteria plan. Those are exempt from Social Security and Medicare tax, which is a benefit no IRA or 401(k) contribution gets.

Contribute directly to the HSA from your bank account instead and you still get the income tax deduction, but you pay FICA on that money. On a $4,300 contribution the difference is $329 a year. If your employer offers payroll deduction, use it; the calculator below assumes you have.

HSA as a retirement strategy: After age 65 you can withdraw for any purpose without the 20% penalty, though non-medical withdrawals are taxed as ordinary income, exactly like a traditional IRA. Before 65 that penalty is steep and applies on top of the income tax. In effect the HSA is a better-than-401(k) account for medical costs and a slightly-worse-than-401(k) account for everything else, which is why the usual advice is to spend it on healthcare and treat the rest as a bonus.

The optimal strategy: Financial planners often recommend maximizing HSA contributions, investing the funds for long-term growth, and paying current medical expenses out of pocket. You can reimburse yourself from the HSA at any future date for medical expenses you have already paid, with no time limit. Keeping receipts allows you to grow the HSA tax-free for decades and then withdraw tax-free.

Average healthcare costs in retirement: A 65-year-old couple retiring today can expect to spend approximately $300,000 or more on healthcare throughout retirement, including Medicare premiums, supplemental insurance, and out-of-pocket costs. A well-funded HSA can significantly offset these expenses.

Investment options: Many HSA providers offer investment options once your balance exceeds a threshold (typically $1,000-$2,000). Investment options range from mutual funds to target-date funds, similar to retirement account options.