HSA Contribution Calculator

For 2026 the limit is $4,400 for self-only high deductible health plan coverage and $8,750 for family coverage, set by IRS Revenue Procedure 2025-19. Account holders aged 55 and over may add a $1,000 catch-up contribution. These limits include anything your employer contributes on your behalf, which is the detail most people forget when planning their own payroll deferrals.

Eligibility is tested on the first day of each month, and your limit is the annual amount times eligible months divided by twelve. Seven months of family coverage gives $8,750 × 7/12, or $5,104.17. The catch-up is prorated identically. This matters whenever you start a job, change plans, or enrol in Medicare part way through the year.

If you are HSA-eligible on 1 December, you may contribute the full annual limit for that year even if you were covered for only part of it. The catch is the testing period: you must remain HSA-eligible for all twelve months of the following year. Fail it and the extra contribution becomes taxable income plus a 10% additional tax.

Yes, but each catch-up must go into that spouse's own HSA. A couple both aged 55 or over sharing family coverage can contribute $8,750 plus $1,000 each, but the second $1,000 cannot sit in the same account. That usually means opening a second HSA in the other spouse's name purely to hold their catch-up amount.

For 2026 a qualifying HDHP must have an annual deductible of at least $1,700 for self-only coverage or $3,400 for family coverage, with out-of-pocket maximums not exceeding $8,500 and $17,000 respectively. If your plan falls outside those bounds it is not HSA-eligible, and any contribution you make would be an excess contribution.

Excess contributions face a 6% excise tax for each year they remain in the account. You can avoid it by withdrawing the excess, plus any earnings on it, before your tax filing deadline including extensions. The earnings withdrawn are taxable. Employer contributions count toward your limit, so mid-year job changes are a common cause of accidental excess.

Yes. Medicare enrolment ends HSA eligibility from the first day of the month it begins, so your limit is prorated to the months before that. Medicare Part A can be backdated up to six months when you enrol after 65, which retroactively removes eligibility for those months — a frequent and expensive surprise for people who keep contributing while working past 65.

An HSA belongs to you permanently and rolls over every year with no forfeiture, while a flexible spending account belongs to your employer's plan and is largely use-it-or-lose-it, with only a small carryover or short grace period allowed. HSAs require HDHP coverage and let unused funds be invested; a general-purpose FSA disqualifies you from HSA eligibility entirely if you hold both at once.

Yes. The $4,400 self-only and $8,750 family limits for 2026 include every dollar contributed to your HSA from any source, employer or employee. If your employer puts in $1,000 toward self-only coverage, your own remaining room for the year drops to $3,400, not the full $4,400 — a detail worth checking against your pay stub before setting a payroll deferral.

Only if you are not enrolled in Medicare and still hold qualifying HDHP coverage. Enrolling in any part of Medicare, including Part A, ends HSA eligibility from that month forward. Many people who delay Medicare because they are still working, and covered by an employer HDHP, can keep contributing past 65, but the moment Medicare coverage starts, contributions must stop.

Nothing — it stays exactly where it is. Unlike an FSA, an HSA has no use-it-or-lose-it deadline. The full balance carries forward indefinitely, continues to grow tax-free if invested, and remains yours even after you change jobs, change health plans, or retire, since the account belongs to you rather than to any employer's plan.

Before age 65, a non-medical withdrawal is taxed as ordinary income and hit with an additional 20% penalty on top. After age 65, that 20% penalty disappears entirely; the withdrawal is still taxed as ordinary income, similar to a traditional IRA distribution, but there's no additional tax for spending HSA funds on something other than a qualified medical expense.

An HSA only pairs with a high deductible health plan, so you're exposed to at least $1,700 in self-only costs or $3,400 for family before coverage kicks in during 2026. Spend on anything non-medical before age 65 and you owe income tax plus a 20% penalty on the withdrawal. You also need to keep receipts indefinitely, since the IRS can ask you to substantiate a withdrawal years after the fact.

Divide your prorated annual limit by the months you'll be eligible. For a full 2026 covered by an HDHP all year, that's roughly $367 a month for self-only coverage or $729 for family, before any catch-up. Someone 55 or older can add about $83 a month toward the $1,000 catch-up. This calculator's "per eligible month" output does that division automatically for whatever coverage and timeframe you enter.