How contributions work

You put money into your HSA through your employer's payroll, by making a direct deposit from your bank account, or by mailing a check to the account custodian. The most common route is payroll deduction — your employer takes the money before taxes are calculated, which lowers your taxable income for the year. If you don't have employer access, you can contribute on your own by contacting your HSA provider directly and asking for their contribution methods.

The money you contribute stays in the account until you spend it on may have access to medical expenses. You don't have to spend it in the year you contribute it. Unlike a flexible spending account (FSA), an HSA does not have a "use it or lose it" rule — unspent money rolls over to the next year and grows tax-free.

Key Takeaways

  • Payroll deduction is the fastest way to contribute because your employer handles the paperwork and the money comes out before income tax is calculated.
  • You can also contribute on your own by bank transfer, check, or online payment directly to your HSA custodian if you don't have payroll access.
  • There is a yearly limit on how much you can contribute — the amount depends on whether your health plan covers just you or your whole family, and it changes each year.
  • Contributions made through payroll reduce your taxable income, but contributions you make on your own must be deducted on your tax return to get the same benefit.
  • You can contribute to an HSA only if you are enrolled in a high-deductible health plan (HDHP) and have no other health coverage that disqualifies you.

Contribution limits for 2024 and 2025

The IRS sets a yearly cap on HSA contributions. For 2024, the limit is $4,150 if your health plan covers only you, and $8,300 if it covers you and at least one other person. For 2025, the limit is $4,300 for self-only coverage and $8,550 for family coverage. These numbers change most years, so check with your HSA provider or the IRS website before you contribute.

If you are 55 or older, you can contribute an extra $1,000 per year on top of the standard limit. This is called a catch-up contribution, and it applies only to you — your spouse cannot use your catch-up room even if you are on a family plan together.

If you enroll in an HDHP partway through the year, you can still contribute a full year's worth of money to your HSA. However, if you drop your HDHP coverage or gain other health coverage that disqualifies you, you cannot contribute for the rest of that year.

Payroll contributions through your employer

If your employer offers an HSA, payroll deduction is usually the easiest method. You fill out a form — often called an HSA salary reduction agreement or election form — and your employer deducts the amount you choose from each paycheck before income tax and payroll taxes are taken out. This means you save money on federal income tax, Social Security tax, and Medicare tax.

You can change your contribution amount once a year during your employer's open enrollment period, or immediately if you have a may have access to life event such as marriage, birth, or loss of other health coverage. Some employers allow mid-year changes without a may have access to event, so check your plan documents or ask your benefits administrator.

Your employer sends the money to your HSA custodian — the bank or financial institution that holds your account. This usually happens within a few days of each paycheck. You should see the deposit in your HSA account online.

Self-directed contributions outside payroll

If you don't have access to payroll deduction — for example, if you are self-employed or your employer doesn't offer an HSA — you can contribute on your own. Contact your HSA custodian and ask what methods they accept. Most accept bank transfers (ACH), checks by mail, and online bill pay from your personal bank account.

When you contribute on your own, the money does not come out before taxes. To get the tax benefit, you must deduct the contribution on your federal tax return using IRS Form 8889. This means you will not see the tax savings until you file your return, and you must keep records of what you contributed.

You can contribute at any time during the year, but contributions for a specific tax year must be made by the tax filing deadline — usually April 15 of the following year. Some custodians allow you to make contributions for the prior year up to a few weeks after the deadline if you file an extension.

Catch-up contributions if you are 55 or older

Once you turn 55, you can contribute an additional $1,000 per year to your HSA on top of the regular limit. This applies whether you contribute through payroll or on your own. If you contribute through payroll, your employer will add the catch-up amount to your deduction. If you contribute on your own, you simply deposit the extra $1,000 along with your regular contribution.

The catch-up contribution is tied to you as an individual, not to your family plan. If you and your spouse are both 55 or older and on a family HSA plan, you each have your own $1,000 catch-up room — but only if you each have separate HSA accounts. If you share one family account, only one of you can use the catch-up contribution.

What happens if you contribute too much

If you contribute more than the yearly limit, the excess amount is subject to a 6 percent excise tax each year it stays in the account. You must file IRS Form 5329 to report the overage and pay the tax. The excess contribution itself is not taxed again when you withdraw it, but the 6 percent tax applies to the amount that exceeded the limit.

If you discover an overage before you file your tax return, you can withdraw the excess and any earnings on it without penalty, as long as you do so by the tax filing deadline. This is called a corrective distribution. After the deadline, you can still withdraw the excess, but you will owe the 6 percent excise tax and income tax on any earnings.

Frequently Asked Questions

Can I contribute to an HSA if I am covered by Medicare?

No. Once you enroll in Medicare Part A or Part B, you are no longer allowed to make new HSA contributions. You can still withdraw money from your HSA for may have access to medical expenses, but you cannot add more. If you are still working and covered by an employer plan, you must drop the HSA contributions when you enroll in Medicare.

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

Both contributions count toward the yearly limit. If your employer contributes $2,000 and you want to contribute $2,000, your total is $4,000 — which fits within the 2024 self-only limit of $4,150. You and your employer together cannot exceed the limit, so coordinate to avoid an overage.

Can I contribute to an HSA if I have a spouse with a different health plan?

It depends on your spouse's coverage. If your spouse has an FSA or other health coverage that is not an HDHP, you may still be able to contribute to your own HSA — but only if your HDHP does not cover your spouse. If your HDHP covers both of you, your spouse's other coverage disqualifies you both from contributing.

Do I have to contribute the full limit every year?

No. You can contribute any amount up to the limit, or nothing at all. You are not required to contribute every year. However, if you want to take advantage of the tax savings, you should contribute at least enough to cover the medical expenses you expect to have.

What if I change jobs mid-year?

You can still contribute for the full year as long as you remain enrolled in an HDHP. If your new employer offers an HSA, you can set up payroll contributions there. If not, you can contribute on your own to your existing HSA account. Keep track of your total contributions across all sources to stay within the yearly limit.