For 2026, HSA contribution limits are $4,400 if you have self-only high-deductible health plan coverage and $8,750 if you have family coverage, with an extra $1,000 catch-up allowed once you turn 55. Those ceilings cover every dollar going into the account from you, your employer, and anyone else combined. Deposit more than you’re allowed, and the IRS charges a 6% excise tax on the excess for every year it stays in the account.1Internal Revenue Service. Notice 2026-5 – HSA Inflation-Adjusted Amounts for 2026
The 2026 Limits in Detail
The IRS adjusts HSA ceilings each year for inflation. For 2026:
- Self-only HDHP coverage: $4,400
- Family HDHP coverage: $8,750
- Catch-up contribution if you’re 55 or older by year-end: $1,000
Those figures are the combined maximum from all sources. Your payroll deductions, your employer’s match, and anything a relative deposits on your behalf all count against the same number.2Internal Revenue Service. Publication 969 – Health Savings Accounts and Other Tax-Favored Health Plans
The catch-up has a quirk for married couples. When both spouses are 55 or older, each $1,000 catch-up has to go into an HSA in that spouse’s own name. You can’t stack two catch-ups into one account.3Internal Revenue Service. HSA Contribution Limits
How you contribute changes the tax math. Money routed through your employer’s cafeteria plan as a payroll deduction skips federal income tax and also escapes Social Security and Medicare payroll taxes, saving an additional 7.65% compared with contributing after tax and claiming the deduction later. Your employer reports the total, including salary reductions, in box 12 of your W-2 with code W.2Internal Revenue Service. Publication 969 – Health Savings Accounts and Other Tax-Favored Health Plans
Who’s Allowed to Contribute
Eligibility rests on one insurance requirement: you need coverage under a High Deductible Health Plan that meets federal thresholds, and the HDHP has to be your primary health coverage.4Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts For 2026, an HDHP must carry an annual deductible of at least $1,700 for self-only coverage or $3,400 for family coverage, and the annual out-of-pocket maximum (excluding premiums) cannot exceed $8,500 self-only or $17,000 family.5Internal Revenue Service. Rev. Proc. 2025-19 – 2026 HDHP and HSA Limits
You also can’t have other health coverage that pays benefits before the HDHP deductible is met. The usual trap is a general-purpose Flexible Spending Account or Health Reimbursement Arrangement that reimburses routine medical bills. A limited-purpose FSA covering only dental and vision expenses is fine because it doesn’t overlap with your HDHP’s medical coverage. Standalone dental, vision, disability, and long-term care insurance are also fine.2Internal Revenue Service. Publication 969 – Health Savings Accounts and Other Tax-Favored Health Plans
Two more rules catch people off guard. Enrolling in any part of Medicare ends your ability to make new contributions, starting with the month your Medicare coverage begins. And if someone else can claim you as a dependent on their tax return, you’re ineligible to contribute, even if they don’t actually claim you.2Internal Revenue Service. Publication 969 – Health Savings Accounts and Other Tax-Favored Health Plans
Veterans receiving VA medical care for a service-connected disability stay eligible under a statutory exception.4Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts Non-service-connected VA care is treated differently: under IRS administrative guidance, receiving those benefits disqualifies you from contributing for any month that falls within three months after the date of care. Eligibility is checked month by month, so a mid-year change in status can mean you need to prorate.
Partial-Year Eligibility and the Last-Month Rule
If you’re eligible for only part of the year, your limit normally gets prorated. Divide the annual cap by 12, then multiply by the number of months you were an eligible individual on the first day of the month. Family HDHP coverage for seven months of 2026 gives you $8,750 × 7/12 = about $5,104.2Internal Revenue Service. Publication 969 – Health Savings Accounts and Other Tax-Favored Health Plans
There’s a shortcut if you gain eligibility late. The last-month rule says that if you have qualifying HDHP coverage on December 1, you can contribute the full annual maximum as if you’d been eligible all 12 months.4Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts The catch is a testing period: you have to remain an eligible individual from that December through December 31 of the following year.
Fail the testing period for any reason other than death or disability, and the contributions that exceeded your prorated limit get added back into your gross income in the year you lost eligibility, plus a 10% additional tax on that amount.4Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts Switching to a traditional plan, losing your job, or enrolling in Medicare mid-testing-period can all trigger it.
What Happens If You Go Over the Limit
Any amount deposited beyond your annual cap, or contributed during months when you weren’t eligible, counts as an excess contribution. The penalty is a 6% excise tax on the excess amount still sitting in the account at the end of each tax year.6Office of the Law Revision Counsel. 26 USC 4973 – Tax on Excess Contributions to Certain Tax-Favored Accounts and Annuities The important word is “each.” It’s not a one-time hit. Over-contribute by $2,000 and leave the money alone, and you’ll owe $120 every year until you fix it.
You report and pay the excise tax on Form 5329 with your annual return.7Internal Revenue Service. About Form 5329, Additional Taxes on Qualified Plans (Including IRAs) and Other Tax-Favored Accounts The tax applies whether the over-contribution was deliberate or the result of a miscalculation during an insurance change. Ignoring it doesn’t make it go away; unreported excise taxes can generate interest and separate underpayment penalties.
How to Fix an Excess Contribution
You have two options, and timing decides which one is available.
The first is to withdraw the excess before the filing deadline. Contact your HSA custodian and request a distribution of excess contributions. You have to pull out both the excess amount and any earnings it generated while sitting in the account. Finish this by your tax filing deadline, including extensions, and the 6% excise tax doesn’t apply for that year.8Internal Revenue Service. Instructions for Form 8889 The withdrawn earnings get included in your gross income for the year of the withdrawal, but the excess itself isn’t taxed again as long as you didn’t claim a deduction for it. The custodian will send a Form 1099-SA documenting the corrective distribution.9Internal Revenue Service. Instructions for Forms 1099-SA and 5498-SA
The second option is to absorb the excess through future under-contributions. If you miss the withdrawal window, leave the money in, pay the 6% for that year, and contribute less than your limit the next year. The IRS lets you deduct the prior year’s excess in the current year, up to the lesser of your unused contribution room or the total carried over.2Internal Revenue Service. Publication 969 – Health Savings Accounts and Other Tax-Favored Health Plans Once the excess is fully absorbed, the yearly excise tax stops. You pay at least one year of 6%, but you skip the paperwork of calculating attributable earnings.
A Note on the Withdrawal Side
Contribution penalties are separate from withdrawal penalties, and the two often get mixed up. Spending HSA money on non-medical expenses before age 65 triggers income tax plus an additional 20% tax on the withdrawal.4Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts That’s a different rule from the 6% excise tax on excess contributions, and the two can apply in the same year to the same account for different reasons.