Excess HSA contributions carry a 6% excise tax for every year they stay in the account. The corrective distribution, the deadline, and the cheaper alternative.
Over-contributing to an HSA is easier than it sounds, and the penalty is one of the few in the tax code that charges you again every single year until you fix it.
The good news: caught before your tax filing deadline, it costs essentially nothing. Caught later, it compounds.
Rarely through carelessness. The common causes are structural:
Employer contributions counted twice. The annual limit is a combined ceiling covering your payroll deferrals, employer contributions, and direct deposits. If your employer seeds the account with $1,000, your own maximum drops by $1,000. People set a payroll election at the full limit and forget the employer piece.
Mid-year coverage change. Switching from family to self-only coverage lowers your prorated limit, and the payroll election usually does not follow automatically.
Losing eligibility mid-year. Enrolling in Medicare, joining a spouse's non-HDHP plan, or a spouse enrolling in a general-purpose FSA all end eligibility — and contributions after that point are excess. See who is eligible for an HSA for the full list of disqualifiers, several of which people do not realize apply to them.
Two HSAs. Changing jobs mid-year and contributing to both employers' HSAs to their respective maximums. The limit is per person, not per account.
Failing the last-month rule testing period. If you used the last-month rule to contribute the full annual amount and then lost eligibility during the following twelve months, part of that contribution becomes excess retroactively — plus an additional 10% tax. Details in the 2026 limits guide.
Both spouses contributing the family maximum. The family limit is shared between spouses, not doubled.
Excess contributions are subject to a 6% excise tax, and the crucial detail is that it applies for every year the excess remains in the account. It is not a one-time charge. Leave $2,000 of excess in place for five years and you have paid 6% of it five times.
You report it on Form 5329, and the excess is also included in your taxable income for the year it was contributed.
If you catch it before your tax filing deadline including extensions for the year of the excess, you can avoid the excise tax entirely.
What to do:
Tax treatment: the returned excess is included in your income for the contribution year — you never got the deduction, effectively. The earnings withdrawn are taxable in the year they are distributed. No 6% excise tax, and no 20% penalty.
Stop the contributions immediately as well. Adjust your payroll election the same week; every additional pay period adds to the problem.
If you have missed the deadline, or the amount is small enough that the paperwork is not worth it, there is a second route.
Leave the excess in the account and apply it against a future year's contribution limit. If you have $1,000 of excess and next year's limit is $4,400, you contribute only $3,400 of new money and the excess absorbs the rest.
The cost: you pay the 6% excise tax for each year the excess sits in the account, including the year it is finally absorbed. On $1,000, that is $60 per year.
This is the sensible option when the corrective-distribution window has closed. It is not a way to avoid the penalty — it is a way to stop it recurring.
Three habits prevent nearly all of this:
Add up all sources in January. Payroll election × pay periods, plus employer contributions, plus anything you plan to deposit directly. Compare against your limit.
Recalculate after any change — job, health plan, marital status, a spouse's benefits enrollment, Medicare. These are the moments excess contributions are created.
Check your W-2 Box 12 code W in January. That figure is the combined employer-plus-payroll contribution for the year. If it exceeds your limit, you have found the problem while the corrective-distribution window is still wide open.
That last check takes about thirty seconds and catches the majority of cases in time for the free fix.
Worth stating, because people over-correct. An excess contribution does not invalidate your HSA, does not affect the rest of the balance, and does not touch your ability to reimburse yourself for qualified expenses. It is a contribution problem, contained to the excess amount and its earnings.
Your accumulated receipts remain reimbursable in full — which is the underlying asset here, and the reason keeping them organized matters more than any single year's contribution. See how long to keep HSA receipts and how to reimburse yourself.
This article is general information, not tax advice. Excess contribution corrections involve specific IRS forms and deadlines, and the right approach depends on timing and amount. Consult a tax professional before acting.