Excess HSA Contributions: How to Fix Them Before You File

How Excess HSA Contributions Happen

For 2025, if you have self-only HDHP coverage, you can contribute up to $4,300. If you have family HDHP coverage, you can contribute up to $8,550. If you are an eligible individual who is age 55 or older at the end of your tax year, your contribution limit is increased by $1,000. These limits sound simple, but real life creates complications.

The most common cause of excess contributions is mid-year coverage changes. You start the year with family coverage, your employer contributes $1,000, and you set up payroll deductions for $7,550 to hit the $8,550 family limit. Then in August, your spouse gets a new job with better insurance. You switch to self-only coverage. Your limit just dropped to $4,300, prorated for the months you had each coverage type.

Employer matching creates another trap. Your employer contributes $2,000 to your HSA in January. You contribute $2,400 throughout the year, thinking you are safely under the $4,300 limit. But all contributions count toward the limit, regardless of source.

Medicare enrollment catches people off guard every year. If you are enrolled in Medicare, your contribution limit is zero. This rule applies to periods of retroactive Medicare coverage. So if you delayed applying for Medicare and later your enrollment is backdated, any contributions to your HSA made during the period of retroactive coverage are considered excess. The six-month lookback period means if you apply for Social Security at 65, your Medicare coverage may backdate six months, turning valid contributions into excess contributions overnight.

The last-month rule adds complexity. Under the last-month rule, if you are an eligible individual on the first day of the last month of your tax year (December 1 for most taxpayers), you are considered an eligible individual for the entire year. You must remain an eligible individual during the testing period. For the last-month rule, the testing period begins with the last month of your tax year and ends on the last day of the 12th month following that month (for example, December 1, 2025, through December 31, 2026).

Multiple HSAs compound tracking difficulty. You have an HSA from your previous employer with $10,000, and your new employer opens another HSA and starts contributing. You forget to coordinate, and both accounts receive contributions.

The 6 Percent Excise Tax: What You Are Facing

Generally, you must pay a 6% excise tax on excess contributions. See Form 5329, Additional Taxes on Qualified Plans (Including IRAs) and Other Tax-Favored Accounts, to figure the excise tax. The excise tax applies to each tax year the excess contribution remains in the account.

That 6% penalty is not one-time. It compounds annually until you remove the excess. If you contributed $500 too much in 2025 and do nothing, you owe $30 for 2025. Leave it there, and you owe another $30 for 2026, plus another $30 for 2027, and so on.

The penalty applies to the smaller of your total excess or your account balance. If your excess is $500 but your account grows to $15,000, you pay 6% of $500. But if you had multiple years of excess totaling $2,000, you pay 6% of $2,000.

The excise tax calculation happens on Form 5329, Part VII. Line 49 shows the additional tax: enter 6% of the smaller of line 48 or the value of your HSAs on December 31, 2025 (including 2025 contributions made in 2026). Include this amount on Schedule 2 (Form 1040), line 8.

Excess contributions are not deductible. Excess contributions made by your employer are included in your gross income. If the excess contribution is not included in Form W-2, box 1 you must report the excess as other income on your tax return. This creates a double hit: you pay income tax on the excess and then pay the 6% excise tax on top.

Option 1: Request a Return of Excess Before April 15

The cleanest fix is requesting a return of excess contributions before your tax filing deadline. You may withdraw some or all of the excess contributions and avoid paying the excise tax on the amount withdrawn if you meet specific conditions. You must withdraw the excess contributions by the due date, including extensions, of your tax return for the year the contributions were made.

This option eliminates the 6% excise tax completely. You must withdraw both the excess contribution and any earnings it generated. The earnings calculation matters. Your HSA provider must calculate the net income attributable (NIA) to the excess contribution. Most providers handle this calculation, but you need to specifically request a return of excess contribution so they apply the right formula.

The tax treatment is specific. The excess contribution itself is not taxable when withdrawn (you already could not deduct it). But the earnings are taxable. If you withdrew the excess, plus any earnings, by your federal income tax return's due date, you must include the earnings in your taxable income in the year you received the distribution even if you used it to pay qualified medical expenses. Include these earnings on the other income line of your income tax return.

The correction must happen by April 15, 2026 for 2025 contributions. If you file for an extension, you have until October 15, 2026. But the six-month extension only works if you file the extension before April 15.

If you timely filed your return without withdrawing the excess contributions, you can still make the withdrawal no later than 6 months after the due date of your tax return, excluding extensions. If you do, file an amended return with "Filed pursuant to section 301.9100-2" written at the top. Include an explanation of the withdrawal.

Option 2: Apply Excess to the Following Year

The second option is carrying forward the excess to the next year. This involves deducting some or all of your HSA excess contributions and applying them to a future year. The IRS does not allow you to apply more than you have in excess.

This option only works if you will be HSA-eligible in 2026 and have not already maxed out your 2026 contributions. For 2026, if you have self-only HDHP coverage, you can contribute up to $4,400. If you have family HDHP coverage, you can contribute up to $8,750.

The penalty still applies for 2025. If you opt to roll forward some, but not all, of the excess contributions, you will owe the 6 percent tax on any that are not applied to a future year. This means you will incur the 6 percent excise tax every year until you remove it from the account or apply it to a future year.

The carryforward happens automatically through Form 5329 reporting. You report the excess on your 2025 Form 5329, pay the 6% tax, and then reduce your 2026 excess by any under-contribution in 2026.

This strategy makes sense if you contributed $200 too much in 2025 and plan to contribute $4,200 instead of the full $4,400 limit in 2026. The $200 excess from 2025 fills the $200 gap in 2026. You pay $12 in excise tax for 2025 (6% of $200), but avoid ongoing penalties.

It does not make sense if you are no longer HSA-eligible. Medicare enrollment, loss of HDHP coverage, or other disqualifying factors mean you cannot use the carryforward method.

How to Request a Return of Excess From Your HSA Provider

Each HSA provider has a specific process for excess contribution removal. You cannot just withdraw the money yourself and call it an excess contribution. The provider must code it correctly for IRS reporting.

Fidelity HSA: Log into your account at Fidelity.com, navigate to your HSA, and look for forms under the Service menu. The form requires you to specify the tax year, the excess amount, and whether you want the distribution via check or electronic funds transfer.

Optum Bank: Download the Excess Contribution and Deposit Correction Request Form from the Optum Bank website or request it by calling the number on your HSA debit card. Funds will be returned via check to the address on file for your HSA. Mail the completed form to Optum Bank, P.O. Box 271629, Salt Lake City, UT 84127.

HealthEquity: Log into your account, select the Support icon, then click Fill out a Form to access the Distribution of Excess HSA Contribution Form.

HSA Bank: Contact HSA Bank customer service at the number on your account statements. They will guide you through the excess contribution removal process and mail you the necessary forms.

The timing of your request matters. If you request the removal before December 31, 2025, you typically will not need corrected tax forms. If you request it between January 1 and April 15, 2026, you will receive a 2026 Form 1099-SA reporting the distribution, even though it corrects a 2025 excess.

The key phrase to use: "I need to request a return of excess contribution with net income attributable for tax year 2025." This specific language ensures the provider codes the distribution correctly. Do not say "I want to withdraw money" or "I need a distribution." Use the exact term "return of excess contribution."

Document everything. Save copies of your request form, confirmation emails, and the distribution check or transfer confirmation. You will need these records when preparing your tax return.

If your excess resulted from payroll contributions, notify your employer immediately. They may need to issue a corrected W-2 if the excess was made through pre-tax payroll deductions.

Reporting the Correction on Form 8889 and Form 5329

The tax reporting depends on whether you removed the excess before filing or carried it forward.

If you removed the excess before April 15: Your HSA provider will send you a Form 1099-SA for the year you received the distribution. Box 1 shows the total distribution (excess plus earnings). Box 2 shows only the earnings portion. Box 3 contains code 2, indicating excess contribution removal.

Report this on Form 8889. The distribution goes on line 14b as a non-taxable distribution. The earnings portion from Box 2 goes on Schedule 1 (Form 1040), Part I, line 8z as other income. The excess contribution itself does not appear on your tax return as income because it was never deductible. Only the earnings are taxable.

If you paid the excise tax and carried forward: Complete Form 5329, Part VII (lines 42-49). Line 42 carries over prior year excess from your 2024 Form 5329, line 48. Line 43 shows any under-contribution in 2025 (your limit minus your actual contributions). Line 44 shows distributions you took in 2025. Line 47 shows your new excess for 2025. Line 48 adds everything together. Line 49: Additional tax. Enter 6% of the smaller of line 48 or the value of your HSAs on December 31, 2025 (including 2025 contributions made in 2026). Include this amount on Schedule 2 (Form 1040), line 8.

Form 8889 and Form 5329 work together. Form 8889 shows your contribution limit and actual contributions. Form 5329 uses those numbers to calculate the excise tax.

What If You Already Filed Your Taxes

If you filed your 2025 return in early March and then discovered the excess, you have options. If you timely filed your return without withdrawing the excess contributions, you can still make the withdrawal no later than 6 months after the due date of your tax return, excluding extensions. If you do, file an amended return with "Filed pursuant to section 301.9100-2" written at the top. Include an explanation of the withdrawal.

The six-month grace period gives you until October 15, 2026 (six months after April 15) to withdraw the excess and file an amended return. This option only works if you have not already filed for an extension. If you extended your return to October 15, that is your final deadline.

Contact your HSA provider immediately and request the return of excess contribution. They will process it and send you a Form 1099-SA showing code 2 in Box 3. This form will be dated in the year you receive it (2026 if you withdraw in 2026), but it corrects the 2025 excess.

File Form 1040-X (Amended U.S. Individual Income Tax Return) for 2025. Attach a new Form 8889 showing the corrected contributions on line 2 and the excess distribution on line 14b. Include a new Form 5329 if needed, showing zero excess after the withdrawal. Write "Filed pursuant to section 301.9100-2" at the top of page 1.

The amended return should show any refund of excise tax you paid. If you filed your original return showing excess contributions and paid the 6% tax, the amended return removes that tax.

If you miss the six-month deadline, you must pay the excise tax for 2025 and can only remove the excess going forward. You will need to file Form 5329 for 2025 showing the excess, pay the applicable tax amount, and then remove the excess in 2026 to stop the penalty from continuing.

Some people try to bury the excess by taking a distribution and claiming it was for medical expenses. This does not work. The IRS treats late-removed excess as a regular distribution, subject to tax and the 20% penalty if you are under 65.

Preventing Excess Contributions in the Future

An ounce of prevention beats dealing with Form 5329. Here is how to avoid excess contributions before they happen.

Track your contributions monthly. Create a simple spreadsheet with your contribution limit at the top, then subtract each contribution as it posts. Your HSA provider's website shows your total contributions for the year, but verify it matches your records. Employer contributions sometimes post late.

Adjust payroll contributions immediately when coverage changes. If you switch from family to self-only coverage in July, recalculate your monthly contribution that same month. Waiting until December creates a six-month overcontribution problem.

Use our contribution calculator to verify your exact limit before making prior-year contributions. The calculator accounts for partial-year eligibility, mid-year coverage changes, and the catch-up contribution.

Coordinate with your employer on contribution amounts. At the start of each year, ask HR exactly how much the employer will contribute. Subtract that from your limit to determine your maximum personal contribution. If your employer contributes quarterly instead of monthly, mark those dates on your calendar so you do not over-contribute.

Monitor Medicare enrollment timing carefully if you are approaching 65. If you apply for Medicare Part A after age 65, the Social Security Administration automatically backdates your coverage by up to six months. To avoid this, you must stop all contributions six months before you apply for Social Security or Medicare.

Set up separate HSAs if both spouses are over 55. If you and your spouse are both age 55 or over, not enrolled in Medicare, and otherwise eligible, you each can make $1,000 HSA catch-up contributions, but you must do so in separate HSAs. Spouses cannot share an HSA. The catch-up contribution belongs to the individual over 55, not the family.

Stop contributions at least one month before you expect to lose eligibility. Coverage gaps happen. Your employer eliminates the HDHP option. You switch to a low-deductible plan. You qualify for subsidized marketplace coverage. Building in a one-month buffer ensures you do not accidentally contribute during a month you were ineligible.

Review your Form 5498-SA carefully each May. This form shows total contributions made for the prior year, including contributions made between January 1 and April 15. If the number looks wrong, contact your provider immediately. Errors happen, and catching them early in the year gives you time to fix them before filing next year's return.

Frequently Asked Questions

Q: Can I just take a regular distribution to fix an excess contribution?

No. Regular distributions do not eliminate excess contributions. You must specifically request a return of excess contribution from your HSA provider. Regular distributions may be taxable and subject to the 20% penalty if used for non-qualified expenses.

Q: What if I contributed too much in 2024 and just discovered it now while preparing my 2025 return?

You will owe the 6% excise tax for each year the excess remained in your account (2024 and beyond), which you will report using Form 5329 for each of those years. You do not necessarily need to file complete amended returns - you can just file Form 5329 separately for the previous years along with payment for the excise tax. You can remove the excess now to stop future penalties, but you cannot avoid the 2024 excise tax at this point.

Q: Do I need to remove excess employer contributions differently than my own contributions?

The removal process is the same, but the tax treatment differs. Excess employer contributions made through payroll were never taxed, so they must be added back as income when removed. Your own after-tax contributions were already taxed, so removing them does not create additional income.

Q: What happens to the earnings on my excess contribution?

Your HSA provider calculates the earnings and reports them in Box 2 of Form 1099-SA. These earnings are taxable as ordinary income but not subject to the 20% penalty.

Q: Can I avoid the excise tax by spending down my HSA balance?

Distributions reduce excess contributions on Form 5329. If you are under your limit in future years, that also reduces the ongoing excess.