How to Report Excess HSA Contributions on Your Tax Return

How you report excess HSA contributions on your tax return depends on one thing: whether you pull the excess out of the account by your filing deadline. If you withdraw it in time, you simply leave it off Form 8889 and report the earnings as other income on Form 1040. If you don’t, the excess goes on Form 5329, Part VII, and you owe a 6% excise tax for every year the money stays in the account.1Internal Revenue Service. Publication 969 – Health Savings Accounts and Other Tax-Favored Health Plans

Before working through either path, confirm the number. The 2026 contribution limit is $4,400 for self-only HDHP coverage and $8,750 for family coverage, with an extra $1,000 catch-up at age 55 or older.2Internal Revenue Service. Rev. Proc. 2025-19 – 2026 Inflation Adjusted Amounts for Health Savings Accounts Employer contributions and cafeteria-plan payroll deductions count against the same cap, not on top of it, which is where most surprises come from.3Internal Revenue Service. Instructions for Form 8889 Losing HDHP coverage partway through the year also prorates your limit, which can turn earlier contributions into excess after the fact.1Internal Revenue Service. Publication 969 – Health Savings Accounts and Other Tax-Favored Health Plans

Withdrawing the Excess Before the Filing Deadline

This is the clean fix. For most filers the window closes on April 15 of the year after the contribution, or October 15 if you filed a valid extension.1Internal Revenue Service. Publication 969 – Health Savings Accounts and Other Tax-Favored Health Plans

Call your HSA custodian and ask specifically for a return of excess contribution. The custodian must calculate the earnings attributable to the excess and distribute them along with the principal. Both amounts leave the account together.

A timely correction avoids the 6% excise tax entirely. It also avoids the 20% additional tax that normally applies to non-medical withdrawals, so long as the correction happens by the filing deadline.

How the Withdrawal Flows Through Form 8889

Form 8889 is where all HSA activity gets reported.4Internal Revenue Service. About Form 8889, Health Savings Accounts (HSAs) When you withdraw the excess in time, treat it as if it was never contributed:

  • Line 2: enter your contributions minus the excess you withdrew. The withdrawn amount does not belong here.
  • Lines 3 through 7: your allowable limit, based on coverage type and eligible months.
  • Line 9: employer contributions, including cafeteria-plan payroll deductions (W-2 Box 12, Code W).
  • Line 13: your HSA deduction, which carries to Schedule 1 (Form 1040), Line 13.

Done correctly, Form 8889 will not produce any figure subject to the 6% tax, and you don’t need Form 5329 for this issue.3Internal Revenue Service. Instructions for Form 8889

Reporting the Earnings on Form 1040

Your custodian will issue Form 1099-SA for the corrective distribution. Box 3 should show distribution code 2, which flags the payout as a return of excess.5Internal Revenue Service. Instructions for Forms 1099-SA and 5498-SA The earnings figure on that form is taxable income for the year the excess contribution was made, regardless of when the money physically comes out. Report it as “Other income” on Form 1040.6Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts The excess principal itself is not taxable, because it was never deducted. Keep the 1099-SA with your records rather than attaching it.

Reporting the Excess on Form 5329 When You Miss the Deadline

If the excess is still in the account after your filing deadline (including extensions), you owe a 6% excise tax, calculated on Form 5329, Part VII, and attach the form to your return.7Internal Revenue Service. About Form 5329, Additional Taxes on Qualified Plans The tax is 6% of the excess remaining at year-end, capped at 6% of the total fair market value of all your HSAs at year-end.8Office of the Law Revision Counsel. 26 USC 4973 – Tax on Excess Contributions to Certain Tax-Favored Accounts

Part VII walks through:

  • Line 42: prior-year excess carried from last year’s Form 5329.
  • Lines 43 through 46: reductions for under-contributions and distributions that offset the prior-year excess.
  • Line 47: new excess for the current year.
  • Line 48: total excess, which is the base for the 6% tax.

The resulting tax feeds into Schedule 2 of Form 1040.9Internal Revenue Service. Form 5329 – Additional Taxes on Qualified Plans You have to file Form 5329 even if you otherwise wouldn’t need to file a return that year. The uncorrected excess triggers the filing on its own.

The 6% is not a one-time hit. It applies every year the excess sits in the account. A $1,000 excess left untouched for three years costs $180 in excise tax before you address it.

Fixing Excess You Already Filed With

Late W-2s and unnoticed employer contributions often surface after a return is filed. The IRS gives you six months after the original due date of the return, not counting extensions, to withdraw the excess and file an amended return, but only if your original return was filed on time.3Internal Revenue Service. Instructions for Form 8889

Write “Filed pursuant to section 301.9100-2” at the top of Form 1040-X and include a corrected Form 8889. If the original return already applied the 6% tax on Form 5329, attach an amended Form 5329 showing that the withdrawn amount is no longer excess.

Miss that six-month window as well and the excess stays subject to the 6% tax for that year. Your remaining options are the two below.

Stopping the Penalty in a Later Year

Two ways to end the recurring 6% once the timely correction window has closed.

Withdraw the excess in a future year. The principal comes out tax-free because you never deducted it, but any earnings pulled with it are taxable in the year of the withdrawal. A late withdrawal like this can also trigger the 20% additional tax on non-qualified distributions, unlike a timely correction.

Under-contribute to absorb it. If the excess is carrying forward on Form 5329, contribute less than your allowable limit in a later year and let the gap eat the carryover. A $500 excess from 2026, followed by a $3,900 contribution against a $4,400 self-only limit in 2027, absorbs the excess without any distribution.8Office of the Law Revision Counsel. 26 USC 4973 – Tax on Excess Contributions to Certain Tax-Favored Accounts You still owe the 6% tax for each year the excess was present before it was absorbed, but the meter stops once the carryover reaches zero.