HSA Family Contribution Calculator 2026

Calculate your 2026 Health Savings Account (HSA) contribution limit for self-only or family HDHP coverage, including the age 55+ catch-up (and a separate $1,000 catch-up for a spouse 55+ with their own HSA). Applies last-month-rule proration for partial-year coverage and shows estimated federal income tax + FICA savings. Free, private, runs in your browser.

HDHP Coverage
2026: $4,400 self-only / $8,750 family base limit (Rev. Proc. 2025-19).
Months you were HSA-eligible (HDHP-covered, no other disqualifying coverage). Eligibility tested on the 1st of each month.
Last-month rule: if HSA-eligible on Dec 1, contribute the full annual limit (testing-period applies).
Catch-Up Contributions (age 55+)
A spouse's catch-up MUST be made to a separate HSA in their own name (IRS Pub 969).
Tax Inputs
Payroll HSA contributions skip Social Security + Medicare tax (FICA).
Employer dollars count toward the same combined annual limit.
Your 2026 HSA limit (incl. catch-up)
$0
Headroom (after employer contributions)
$0
Estimated tax savings
$0
Per-paycheck (24 pay periods)
$0
Calculation Breakdown
Item Amount
2026 HSA limits (IRS Rev. Proc. 2025-19): Self-only $4,400 / Family $8,750 / Catch-up (age 55+) $1,000. Last-month rule requires you to remain HSA-eligible through the entire following calendar year (testing period) or the excess over the prorated amount becomes taxable income + 10% penalty.

Source: IRS Revenue Procedure 2025-19 (HSA inflation adjustments) + IRS Publication 969. Last updated: May 3, 2026.
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What Is the 2026 HSA Family Contribution Limit?

A Health Savings Account (HSA) lets you set aside pre-tax dollars to pay for qualified medical expenses if you are covered by a High-Deductible Health Plan (HDHP). For 2026, the IRS contribution limit is $4,400 for self-only HDHP coverage and $8,750 for family HDHP coverage (Revenue Procedure 2025-19). Account holders age 55 or older can add a $1,000 catch-up contribution. If both spouses are 55+, each catch-up must go into a separate HSA in that individual's own name — the limits do not stack into one account. Source: IRS Revenue Procedure 2025-19.

HSA dollars get a triple tax advantage: tax-deductible going in, tax-free growth, and tax-free withdrawals for qualified medical expenses. Contributions made through a Section 125 cafeteria plan (payroll) also skip FICA — an extra 7.65% savings on top of federal income tax — which can be worth several hundred dollars per family annually compared with making the same contribution directly to the HSA.

How Last-Month Rule and Proration Work

HSA eligibility is tested on the first day of each month. If you only had HDHP coverage for part of 2026, your contribution is normally prorated: full annual limit × (eligible months ÷ 12). The last-month rule is an exception — if you are HSA-eligible on December 1, 2026, you may contribute the full annual limit, regardless of when coverage started in the year.

The catch is the testing period: you must remain HSA-eligible for all 12 months of the following calendar year (2027). If eligibility ends early — for example, you switch to a non-HDHP, enroll in Medicare, or accept a job with an FSA — the difference between the full-year amount and your prorated amount becomes taxable income plus a 10% additional tax. For someone unsure about future coverage, prorating is the safer choice.

How HSA Contributions Save You Tax

HSA contributions reduce taxable income at your marginal federal rate. A family at the 22% bracket maxing $8,750 saves $1,925 in federal income tax. If contributed through payroll, you also save 7.65% FICA — another $669 — for a combined $2,594 effective benefit. Add another $1,000–$2,000 in catch-up contributions if you (or you and your spouse) are 55+ and the savings can exceed $3,000 in a single tax year.

Employer HSA contributions count toward the same annual limit but do not appear in your taxable wages either way. Make sure to subtract the employer dollars before deciding how much you can personally add — exceeding the combined limit triggers a 6% excise tax on the excess each year it remains in the account.

Common Mistakes to Avoid

Top mistakes: (1) double-counting an employer contribution into the personal limit, (2) using last-month rule then losing HDHP coverage in early 2027 (triggers tax + 10% penalty on the unprorated portion), (3) enrolling in Medicare while still funding an HSA (Medicare disqualifies you), (4) having a general-purpose FSA — even your spouse's — which makes you HSA-ineligible, and (5) contributing both spouses' $1,000 catch-up into one HSA (each catch-up must be in the named individual's own account).

Use this calculator to confirm your headroom, then verify with your payroll/HR or HSA custodian before December 31, 2026 (or the tax-filing deadline in April 2027 for prior-year contributions). Last updated: May 3, 2026. Source: IRS Publication 969 — HSAs and Other Tax-Favored Health Plans.