Form 8889 Guide for Small Business Owners With HSAs

Form 8889 reports your health savings account contributions, deductions, and withdrawals to the IRS. You file it with your federal income tax return when you have reportable HSA activity, including contributions made by an employer.

For small business owners, the business structure matters. A sole proprietor generally claims an HSA deduction on a personal return, while an S corporation's contribution for a shareholder-employee may need different payroll treatment.

The following rules use tax year 2025 figures and forms. Start with your eligibility, then use your contribution and distribution records to complete the return.

What Form 8889 Does

Form 8889 has three parts. Together, they calculate your HSA deduction, identify taxable withdrawals, and account for certain additional taxes.

Part I covers contributions and the deduction. Part II covers distributions, including any amount spent on nonqualified expenses. Part III applies when you must report income and an additional tax after failing certain HSA testing periods.

You generally need the form if you or your spouse had HSA contributions or distributions during the tax year, even if an employer made the contributions. If both spouses have reportable HSA activity, each completes a separate Form 8889, even on a joint return.

You attach Form 8889 to Form 1040, Form 1040-SR, or Form 1040-NR. Amounts calculated on it can flow through Schedule 1 and Schedule 2 to the rest of your return.

The IRS Form 8889 instructions provide the line-by-line rules for the 2025 form. Keep your HSA statements nearby as you work through them: a withdrawal can be tax-free, but it still generally must be reported.

HSA Eligibility and Contribution Limits for 2025

An HSA can offer a personal tax deduction, tax-free account growth, and tax-free withdrawals for qualified medical expenses. However, you must meet the eligibility rules to contribute.

Who Can Contribute to an HSA?

You generally qualify for a month if, on its first day, you have HSA-eligible high-deductible health plan coverage and meet the other IRS requirements. For example, you can't be enrolled in Medicare or be someone else's tax dependent.

Other health coverage can also affect eligibility. A general-purpose health flexible spending arrangement, including one offered through a spouse's employer, can make you ineligible to contribute. Certain limited-purpose arrangements are permitted.

Eligibility to contribute is separate from your ability to spend existing HSA funds . You can generally use money already in your account for qualified expenses even after you no longer qualify to make contributions.

How Much Can You Contribute?

For someone eligible for every month of 2025 under the same type of coverage, the annual limits are:

| 2025 coverage type | Annual contribution limit | | | | | Self-only | $4,300 | | Family | $8,550 |

The limit includes contributions made by you, your employer, and others on your behalf. If you were eligible for only part of the year, your limit is generally based on your eligible months.

An eligible person who turned 55 or older by December 31, 2025, may also qualify for a $1,000 catch-up contribution. Each eligible spouse must put their catch-up contribution in their own HSA.

The last-month rule can allow a full-year limit if you're eligible on December 1, 2025. However, it comes with a testing period that generally runs through December 31, 2026. Losing eligibility during that period can trigger tax.

Part I: Report Contributions and Calculate Your Deduction

Part I of Form 8889 brings your contribution records together and calculates how much you can deduct. You don't have to itemize deductions to claim an eligible HSA contribution.

Enter Personal and Employer Contributions

Start with contributions made for the tax year, including eligible contributions made by someone else on your behalf. For 2025, contributions designated for that year could generally be made through April 15, 2026.

Employer contributions generally appear in box 12 of Form W-2 under code W. That figure also includes contributions made through a cafeteria plan by salary reduction. Enter those amounts in the employer contribution portion of Form 8889, rather than claiming them again as personal contributions.

For example, an owner with year-round self-only eligibility in 2025 could have $1,500 in code W contributions and contribute another $2,800 personally. Together, those amounts reach the $4,300 limit. Assuming no other adjustments, the personal contribution could be deductible.

Carry the Deduction to Your Return

Form 8889 compares your personal contributions with the available limit after accounting for employer contributions and other applicable adjustments. The allowable deduction generally appears on line 13 of Form 8889 and carries to Schedule 1, Part II, line 13.

Avoid double counting. A code W amount may include money withheld from your paycheck, but those salary-reduction contributions don't also belong in your personal contribution total.

Keep your account statements and contribution confirmations with your tax records. Form 5498-SA provides contribution information, but it may arrive after you've filed, so your own records are useful when preparing the return.

How Your Business Structure Affects HSA Reporting

Your HSA belongs to you, even if business funds help pay for it. The reporting treatment depends in part on how your business is taxed.

Sole Proprietors and Single-Member LLCs

A sole proprietor generally claims an eligible HSA deduction as a personal adjustment to income, not as a Schedule C business expense. That means the deduction reduces adjusted gross income but doesn't directly reduce Schedule C net profit or self-employment tax.

A single-member LLC with default federal tax treatment generally follows the same approach. Keep the HSA payment separate from ordinary business expenses in your records so it doesn't appear as both a Schedule C deduction and a personal deduction.

For the business side of the return, our Schedule C guide for sole proprietors explains how business income and expenses are reported.

S Corporation Shareholder-Employees

Special rules apply when an S corporation contributes to the HSA of a shareholder-employee who owns more than 2% of the company. The IRS treats those contributions for services as guaranteed payments: the corporation generally deducts them, and the shareholder includes them in gross income.

The shareholder can then claim an eligible personal HSA deduction on Form 8889, subject to the contribution limit and other rules. Don't treat that amount as an ordinary tax-free employer HSA contribution.

Payroll and ownership details matter, including family attribution rules that can affect who counts as a more-than-2% shareholder. Have your tax preparer coordinate the corporate return, payroll records, and personal return.

Health insurance premiums are a separate issue from HSA contributions. Our guide to S corporation health insurance deductions covers that related topic.

Part II: Report HSA Withdrawals

Part II reconciles money taken out of the HSA with the qualified medical expenses it paid. Your HSA custodian generally reports distributions on Form 1099-SA.

Identify Qualified Medical Expenses

Withdrawals are generally tax-free when used exclusively for qualified medical expenses for you, your spouse, or your eligible dependents. Common examples include doctor visits, prescription medications, and dental care that insurance doesn't reimburse.

The expense must have been incurred after the HSA was established. You also can't use the same expense to justify a tax-free HSA withdrawal and claim it again as an itemized medical deduction.

Health insurance premiums generally aren't qualified HSA expenses, although exceptions exist. They include certain long-term care premiums, COBRA coverage, and coverage while receiving unemployment compensation.

Keep receipts, explanations of benefits, and proof of payment. You usually don't send those records with Form 8889, but you need them to support tax-free withdrawals.

Separate Taxable Withdrawals

Enter total distributions in Part II, then identify how much paid for qualified expenses. The remaining taxable amount generally flows to Schedule 1, Part I, line 8f.

For example, if you withdrew $3,000 and used $2,500 for qualified medical expenses, the remaining $500 would generally be taxable. The account provider's statement alone may not show which expenses qualify, so your receipts matter.

You can find more detail on eligible expenses and HSA distributions in IRS Publication 969.

Additional Taxes and Excess Contributions

A taxable withdrawal can create more than an income tax bill. Separately, contributions above your limit can trigger an excise tax.

The 20% Tax on Nonqualified Withdrawals

A distribution used for a nonqualified expense is generally included in income and subject to an additional 20% tax. On a $500 nonqualified withdrawal, that additional tax would generally be $100.

The 20% additional tax doesn't apply to distributions made after you become disabled, reach age 65, or die. A nonqualified withdrawal can still be taxable income when an exception to the additional tax applies.

Form 8889 calculates the additional tax, which generally carries to Schedule 2, Part II, line 17c.

Excess Contributions and Testing Periods

Contributions above your allowable limit are generally subject to a 6% excise tax for each year the excess remains in the HSA. Form 5329 calculates that tax.

You may be able to avoid the excise tax by withdrawing the excess contribution and its attributable earnings by the applicable return due date, including extensions. The earnings have their own tax reporting treatment.

Part III of Form 8889 addresses certain testing-period failures. For example, if you used the last-month rule for 2025 and fail its testing period for a reason other than death or disability, part of your earlier contribution may become taxable and subject to an additional 10% tax. Part III also covers the testing period for a qualified HSA funding distribution from an IRA.

A Practical Form 8889 Filing Checklist

Gather these records before completing your personal return:

• Your HSA statements showing contributions, withdrawals, and the tax year assigned to each contribution.
• Form W-2, including box 12 code W, if an employer or cafeteria plan contributed.
• Form 1099-SA for distributions and Form 5498-SA when available.
• Records of high-deductible health coverage and any changes during the year.
• Medical receipts and insurance statements supporting tax-free withdrawals.
• Payroll and corporate records if an S corporation contributed to an owner's HSA.
• Your prior-year return and Form 5329 if you have an unresolved excess contribution.

Next, match the records to each part of Form 8889. Separate personal contributions from amounts reported as employer contributions, and don't assume every withdrawal on Form 1099-SA was spent on a qualified expense.

If both spouses have HSA activity, keep their account records separate. Each person's contribution limit and catch-up amount needs its own calculation, even when the household has family coverage.

Finally, carry the deduction, taxable distribution, and any additional tax to the applicable schedules with Form 1040. If your payroll records and HSA statements don't agree, resolving the difference before filing can prevent a duplicate deduction or an incorrect tax calculation.

Put Your HSA Activity on the Right Return

Form 8889 connects your HSA activity to your personal federal tax return. Accurate reporting starts with the year's contribution limit and records of how you spent each withdrawal.

For business owners, the most important distinction is where the contribution belongs. A sole proprietor generally claims the deduction personally, while a more-than-2% S corporation shareholder may have an additional corporate and payroll reporting step.

Our team can help coordinate your business records and individual return when HSA contributions need attention.