IRS Form 8889: How to Report Your HSA (2025 Instructions)

IRS Form 8889 is the form you attach to your Form 1040 to report health savings account (HSA) activity. It shows what you contributed, what you can deduct, what you took out, and whether any of that is taxable. If money went into or came out of an HSA in your name during the year, including contributions your employer made, you generally have to file it.

Here's what the form does, how each part works, and where people make mistakes.

Who has to file Form 8889?

You must file Form 8889 if any of these happened during the tax year:

• You, your employer, or anyone else contributed to an HSA in your name.
• You took a distribution from your HSA, even one spent entirely on medical bills.
• You inherited an HSA because the account owner died.
• You have to include amounts in income because you stopped being HSA-eligible during a testing period. That's covered in Part III below.

The part people miss is that employer-only contributions still require the form. If your W-2 shows an amount in box 12 with code W, you need Form 8889 even if you never put in a dollar yourself.

Married couples who each have their own HSA file separate Forms 8889, one per account holder, even on a joint return.

What paperwork do you need before you start?

Three documents do most of the work:

| Document | What it shows | When it arrives |
|---|---|---|
| W-2, box 12, code W | Employer contributions, including your pre-tax payroll deferrals | January |
| Form 1099-SA | Distributions taken out of the HSA during the year | By January 31 |
| Form 5498-SA | Total contributions for the tax year | By May 31 |

Form 5498-SA often arrives after you've filed, because you can keep contributing for a tax year until the filing deadline. Your own records and your HSA custodian's year-end statement fill the gap. Clean monthly bookkeeping makes this much easier if you pay medical costs from a business account or move money between accounts.

How does Part I work? (Contributions and your deduction)

Part I works out how much you can deduct. Here's the short version line by line:

• Line 1: Check self-only or family coverage under your high-deductible health plan (HDHP). If you switched during the year, check family.
• Line 2: Contributions you made directly, not through payroll. These are the ones you can deduct.
• Line 3: Your annual limit. If you were eligible all year, it's the full figure. If you were eligible for only part of the year, the IRS instructions include a month-by-month worksheet.
• Line 7: The catch-up contribution if you were 55 or older by year-end.
• Line 9: Employer contributions, the code W amount from your W-2.
• Line 13: Your HSA deduction. It carries to Schedule 1 as an above-the-line deduction, so you get it whether or not you itemize.

What are the HSA limits for 2025 and 2026?

| | 2025 | 2026 |
|---|---|---|
| Self-only coverage | $4,300 | $4,400 |
| Family coverage | $8,550 | $8,750 |
| Catch-up (age 55+) | $1,000 | $1,000 |

To be eligible, your plan has to meet the HDHP minimum deductible. For 2025 that's $1,650 for self-only and $3,300 for family coverage. The IRS adjusts these figures every year, so check the current numbers before you contribute.

Employer contributions count toward the same limit. If your employer put in $1,500 and your self-only limit is $4,300, you have $2,800 of room left, not $4,300.

How does Part II work? (Distributions)

Part II reports money you took out and tests whether it was spent on qualified medical expenses.

• Line 14a: Total distributions from box 1 of Form 1099-SA.
• Line 14b: Rollovers, plus excess contributions you withdrew before the deadline.
• Line 15: Unreimbursed qualified medical expenses paid with HSA money.
• Line 16: The taxable amount. This is anything not used for qualified expenses.
• Line 17b: A 20% additional tax on the taxable amount, unless an exception applies.

The 20% additional tax doesn't apply if the distribution was made after you turned 65, became disabled, or died. In those cases the money is still taxable as ordinary income if it wasn't spent on medical care. It just isn't penalized.

The IRS doesn't want your receipts with the return, but it can ask for them later. Keep records that tie each distribution to a real medical expense. If a 1099-SA mismatch has already turned into an IRS notice, our page on IRS and state tax problems covers how those usually get resolved.

What is Part III, and why does it catch people?

Part III covers income and additional tax when you fail to stay HSA-eligible during a testing period. It comes up in two situations.

The last-month rule. If you're HSA-eligible on December 1, you can contribute the full annual amount even if you only had HDHP coverage for part of the year. The catch is that you then have to stay eligible through December 31 of the following year. If you don't, the extra contribution becomes taxable income, plus a 10% additional tax, and it's reported here.

Qualified HSA funding distributions. If you made a one-time transfer from an IRA to your HSA, the same kind of testing period applies.

Typical triggers are starting a new job with a non-HDHP plan, enrolling in Medicare, or a spouse adding you to a traditional plan. Before you use the last-month rule, think through the next 13 months of coverage.

What happens if you contribute too much?

Excess contributions carry a 6% excise tax every year they stay in the account. That tax is reported on Form 5329, not Form 8889. You avoid it by withdrawing the excess and any earnings on it by your filing deadline, including extensions. The withdrawn earnings are taxable in the year you take them out.

The most common causes are:

• Contributing through payroll and directly without counting both.
• Enrolling in Medicare partway through the year and not prorating the limit.
• Changing jobs and having two employers each contribute.
• Using the family limit when your coverage was self-only for most of the year.

Are there special rules for self-employed people and S-corp owners?

Yes. If you're self-employed, your HSA contributions are deducted on Form 8889 and Schedule 1, not as a business expense on Schedule C. They reduce your income tax but not your self-employment tax.

S-corp owners who hold more than 2% of the company have a quirk. When the company pays their HSA contribution, the amount goes into their W-2 wages, and they then take the deduction on Form 8889. Set up correctly, those contributions generally avoid Social Security and Medicare tax. Set up incorrectly, they can show up as a payroll error. Many owners sort this out at the same time as their salary and distribution split. If you run an S-corp, our S-corp tax services cover this setup.

Also keep in mind that a few states, California among them, don't follow the federal HSA rules. In those states, contributions and earnings may be taxable on your state return even though they're tax-free federally.

What changed recently for HSAs?

The One Big Beautiful Bill Act (2025) expanded HSA eligibility starting in 2026. Bronze and catastrophic marketplace plans now count as HSA-compatible, and certain direct primary care arrangements no longer disqualify you. The law also made permanent the rule that lets HDHPs cover telehealth before you meet your deductible. The IRS may update Form 8889 and its instructions to match, so use the current-year instructions when you file. If you're picking a health plan partly for its tax effect, that's a good topic for a tax planning conversation.

Frequently asked questions

Do I need Form 8889 if only my employer contributed to my HSA?

Yes. Employer contributions, shown on your W-2 in box 12 with code W, require Form 8889 even if you made no contributions and took no distributions.

When is the deadline for HSA contributions for 2025?

You can make 2025 contributions until the federal filing deadline in April 2026. Filing an extension does not give you more time to contribute.

Is there a penalty for not filing Form 8889?

The IRS may adjust your return and send a notice. It can also treat unreported distributions as taxable income subject to the 20% additional tax. If you left it off, filing an amended return is usually cleaner than waiting for a notice.

Can I use my HSA for a spouse's or dependent's medical bills?

Yes. Qualified medical expenses for your spouse and tax dependents count, even if they aren't covered by your HDHP.

What if I filed late or left Form 8889 off my return?

File as soon as you can or amend the return. Our guide to missing the tax filing deadline walks through the order of steps.

What should you do next?

Before you file, gather your W-2, Form 1099-SA, and your HSA statement. Then confirm three things: that your total contributions from all sources stay within your limit, that every distribution ties to a medical expense, and whether you used the last-month rule last year. If any of those don't check out, fix it before the deadline. Withdrawing an excess on time costs far less than paying the 6% tax every year it stays in the account.

If your situation is more complicated, such as an S-corp HSA, a mid-year Medicare enrollment, or a coverage change after using the last-month rule, SBZ Tax can review it with you. Call 818-748-2020, visit the SBZ Tax office, or book a free consultation.

This article is general information, not tax advice for your specific situation. HSA rules and limits change each year, so talk with a tax professional before acting on it.