United States · planning estimate

HSA Contribution and Tax-Savings Calculator

Estimate HSA contribution room and the tax savings from an additional contribution in 2026. Enter eligible self-only and family coverage months, employer contributions and your own deposits. Compare direct contributions with qualifying payroll contributions, and use your own marginal tax rates to model federal and state income-tax savings.

Your scenario

Enter your own numbers or load the worked example. Values are calculated in this browser and are not saved.

Tax / distribution year

Age at year end

Eligible self-only months

Eligible family months

Employer HSA contributions ($)

Your HSA contributions already made ($)

Planned additional contribution ($)

Contribution method

Federal marginal tax rate (%)

Applicable state marginal rate (%)

Remaining Social Security wage-base room ($) For payroll contributions; use zero after reaching the annual Social Security wage base.

Your estimate

Complete the scenario to see a result, its breakdown and limitations.

Next steps

Check the assumptions with your records before making a decision. Related calculators can help compare the next part of your plan.

How the estimate works

Prorate the self-only/family limits by eligible months, add eligible age-55 catch-up and subtract employer/personal deposits. Apply entered marginal rates to the additional allowed contribution. Qualifying payroll contributions can also reduce Medicare and uncapped Social Security wages.

Worked example

A 55-year-old eligible for self-only coverage for all 12 months has a $5,400 limit. After $500 employer contributions, $4,900 remains. A $2,000 direct contribution at 22% federal tax saves an estimated $440.

Sources and review scope

Source comparison: 2026-09-23. Methodology owner: Toolistify. Implementation reviewed through automated source checks and regression tests; this is not professional tax, legal, benefits or financial certification.

Calculation inputs stay in this page; CSV downloads are created locally. The optional sales-tax lookup has separate disclosure above. Privacy · Corrections

Questions and answers

Does Medicare enrollment affect eligibility?

Yes. Exclude months when Medicare or other disqualifying coverage prevents an HSA contribution.

Is the last-month rule included?

No. This calculator uses monthly proration and does not assume the last-month-rule testing-period exception.