The three ways to fund an HSA

You can fund an HSA through payroll deductions, direct deposits from your bank account, or by mailing a check to your HSA provider. Most people use payroll deductions because the money comes out before taxes are calculated, which lowers your taxable income for the year. If you don't have an employer plan or your employer doesn't offer payroll deduction, you can set up a bank transfer or mail a check yourself.

The amount you can contribute each year is set by the IRS and changes annually. For 2024, the limit is $4,150 for individual coverage and $8,300 for family coverage. If you're 55 or older, you can add an extra $1,000 per year. These limits explore to all your contributions combined—if you contribute through payroll and also make a personal deposit, both count toward the same annual cap.

Key Takeaways

  • Payroll deduction is the most common funding method because contributions reduce your taxable income before taxes are withheld.
  • You can also fund an HSA through bank transfers or checks if you don't have payroll deduction available through your employer.
  • Annual contribution limits are $4,150 for individual coverage and $8,300 for family coverage in 2024, with an extra $1,000 allowed if you're 55 or older.
  • Contributions made by your employer count toward your annual limit, so track both employer and personal contributions to avoid exceeding the cap.
  • You can contribute at any time during the year, but contributions for a tax year must be made by the tax filing important date (usually April 15) to count for that year.

Setting up payroll deduction through your employer

If your employer offers an HSA, ask your human resources or benefits department for the enrollment form or direct you to the online enrollment system. You'll need to specify how much to deduct from each paycheck. The deduction happens before federal income tax, Social Security tax, and Medicare tax are calculated, so you save on all three.

Payroll deduction is the fastest way to fund because your HSA provider receives the money directly from your employer's payroll system. There's no delay waiting for a check to clear or a bank transfer to process. You can usually change your contribution amount once a year during open enrollment, or if you have a may have access to life event like a change in health coverage.

Making personal contributions by bank transfer

Log into your HSA provider's website or mobile app and look for a "Deposit" or "Add Funds" option. You'll enter your bank account information and the amount you want to transfer. Most HSA providers process bank transfers within one to three business days. Some providers also offer ACH transfers, which work the same way but may have slightly different processing times depending on your bank.

Keep track of how much you've contributed through payroll before you make a personal deposit. If you've already contributed $2,000 through payroll and your limit is $4,150, you can only add $2,150 more without exceeding the annual cap. The IRS charges a 6% penalty tax on any amount over the limit, and you'll have to file a form to correct the overage.

Contributing by mail or cashier's check

Write a check to your HSA provider and mail it to the address listed on their website or your account statement. Include a note with your account number so the deposit gets credited to the right account. Processing time for mailed checks is typically five to ten business days, depending on your HSA provider's location and mail delivery speed.

Mailing a check is slower than bank transfer or payroll deduction, so use this method only if you don't have online access or a bank account linked to your HSA. Some providers accept cashier's checks or money orders as well—call your provider to confirm what forms of payment they accept before you send anything.

Employer contributions and how they affect your limit

If your employer contributes to your HSA, that money counts toward your annual limit. For example, if your employer deposits $1,000 and you contribute $2,000 through payroll, you've used $3,000 of your $4,150 limit. You can still add $1,150 more, but not a dollar beyond that.

Your employer should tell you how much they're contributing and when. Some employers make a single deposit at the start of the year; others spread contributions across paychecks. Ask your benefits department for a written statement of their contribution amount so you know exactly how much room you have left for your own deposits.

important date for contributions and tax reporting

You can contribute to an HSA at any time during the year, but contributions for a specific tax year must be made by the tax filing important date—usually April 15 of the following year. For example, contributions for the 2024 tax year can be made anytime from January 1, 2024, through April 15, 2025. If you miss the important date, that contribution counts toward the next tax year instead.

Your HSA provider will send you a Form 5498-SA in May, which reports your contributions to the IRS. Check this form against your own records to make sure all your contributions are listed correctly. If you find an error, contact your HSA provider right away so they can file a correction.

What happens if you contribute too much

If you exceed the annual limit, the IRS charges a 6% excise tax on the overage each year it remains in the account. You'll also owe income tax on the excess amount. To fix an overage, you must file Form 5329 with your tax return and request a correction. Your HSA provider can help you withdraw the excess, but you're responsible for reporting it to the IRS.

The best way to avoid this is to track your contributions carefully throughout the year. If you contribute through payroll and also make personal deposits, add them together before each deposit to make sure you're staying under the limit. If you change jobs mid-year, remember that your limit doesn't reset—it stays the same across all HSAs you may have.

Frequently Asked Questions

Can I contribute to an HSA if I'm no longer enrolled in a high-deductible health plan?

No. You must be enrolled in a high-deductible health plan on the first day of the month in which you contribute. If you switch to a different type of health plan, you can no longer make new contributions to that HSA, though you can keep the money already in it and spend it on medical expenses.

What if my employer and I both contribute to the same HSA?

Both contributions count toward the same annual limit. If your employer contributes $2,000 and you want to contribute $2,000, your total is $4,000, which is under the $4,150 individual limit for 2024. You'll need to coordinate with your employer's benefits department to avoid going over the cap.

Can I make a lump-sum contribution at the end of the year?

Yes, as long as you make the deposit by the tax filing important date (usually April 15 of the following year). You don't have to spread contributions across the year. However, if you're using payroll deduction, you typically can only change your contribution amount during open enrollment or after a may have access to life event.

Do I need to report HSA contributions on my tax return?

If you contribute through payroll, your employer reports the deduction and you don't need to report it again. If you make personal contributions, you report them on Form 8889 when you file your taxes. Your HSA provider sends you Form 5498-SA to help with this reporting.

What if I want to stop contributing but keep my HSA open?

You can stop making contributions at any time and keep the account open. The money stays in the account and you can continue to spend it on medical expenses. You don't have to close the account or withdraw the balance just because you're no longer contributing.