Health Savings Accounts (HSAs) are one of the most tax-advantaged tools available; however, as with all good things, there are limits to how much you can contribute each tax year. If you accidentally overcontribute to your HSA, the mistake can lead to surprise tax penalties if it isn’t corrected in time.
The good news is that HSA overcontributions are more common than many people realize, and they’re usually fixable. Here’s a closer look at what happens if you contribute more than you’re allowed and the steps you can take afterward.
HSA Contribution Limits for 2026
The amount that can be contributed to an HSA depends on:
- The type of HDHP coverage (individual or family) you have
- Your age
- The date you became an eligible individual, and the date that you cease to be an eligible individual (if applicable)
In 2026, you can contribute up to $4,400 if you are covered by a high-deductible health plan just for yourself, or $8,750 if you have coverage for your family. At age 55, individuals can contribute an additional $1,000.
When You Might Overcontribute to Your HSA
We find overcontributing happens most often in the following circumstances:
Both spouses are on separate HDHP plans, and each has an HSA:
- Each employer doesn’t know what the other is contributing
- If you have children, one spouse would typically have family coverage and the other individual. You are still tied to the maximum family contribution of $8,750 in 2026 between both spouses combined
Job changes:
- You’ll need to ensure you stay within the annual max with all your HSAs
Health insurance coverage changes:
Particularly when you don’t have a high-deductible insurance plan for the entire year.
- Unless you are enrolled in an HSA-eligible plan on December 1st of a given year, you can calculate your prorated max contribution by counting the number of months you were enrolled in an HSA-eligible health plan on the first of a month and dividing it by 12. Then multiply the number by the total amount you could contribute if you were eligible the whole year.
- If you did have an HSA-eligible plan on Dec 1st, you can contribute the maximum amount per the IRS “last month rule”. You must stay enrolled in an HSA-eligible plan for a one-year testing period, which is all of the following tax year.
Good Times to Catch Overcontributions
It’s important to track this yourself and reconcile during your tax preparation. Correcting this before the tax deadline is a good way to limit any tax penalties. Here are a few ways to do so.
When you are reviewing your W2s:
- This will show HSA contributions made by both you and your employer through payroll withholdings
At tax filing:
- Entering HSA contributions made through payroll and outside of payroll is part of completing your tax return forms. This is reconciled on Form 8889.
In correcting this, a standard withdrawal will not resolve this tax issue. Instead, you will need to submit a return of excess contribution form to your HSA custodian. If your account is invested, you may need to make sure you have the appropriate amount of cash available in the account before submitting your form by liquidating a portion of your investments. Most custodians will help you calculate the amount of gains or losses attributable to the amount you overcontributed, as that would need to be removed as well to fully correct this.
What Happens When You File Your Tax Return?
The short answer is that it depends on timing.
If you removed the overcontribution and earnings by that year’s tax filing date:
- If the contribution was made via payroll deduction, it will be added back to your taxable income for the year.
- Earnings are included as “other income” on Schedule 1 of your return. It must be reported on your return the year the excess contribution was made.
If you don’t remove it prior to tax return filing:
- In most cases, the IRS penalty would equal 6% of your total excess contributions. This penalty is known as an excise tax, and is applied annually for each year that the excess contribution stays in the account.
In the event you did not overcontribute to an HSA, you also have until the April 15th tax filing date to add contributions for a prior year if you still have room left to contribute in your HSA. Your tax return filing is a great time to reconcile this as well.
Working with a financial advisor can help you make sure you are utilizing your HSA to the best of your financial situation. To learn more about how we might be able to help, please contact us.
