The HSA: Deductible In, Tax-Free Out, for Business Owners
The one account that is deductible going in, tax-free growing, and tax-free coming out — and how each business structure contributes to it.
Reviewed by the Fairlight Accounting cross-border tax team — U.S. & Canadian Tax Desks
A health savings account (HSA) pairs with a high-deductible health plan. Contributions are deductible, growth is tax-free, and withdrawals for medical costs are tax-free — the only account with all three. Business owners deduct their own contributions on the personal return; employer contributions for employees are excluded from wages and free of payroll tax.
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Who can contribute?
You must be covered by a qualifying high-deductible health plan, have no other disqualifying coverage (including a general-purpose flexible spending account), not be enrolled in Medicare, and not be claimed as a dependent. Starting in 2026, bronze and catastrophic plans available as individual coverage through a marketplace exchange are treated as high-deductible plans, and a direct primary care arrangement no longer disqualifies you if its fees total no more than $150 a month ($300 if it covers more than one person) — the HSA can pay those fees. Covering telehealth before the deductible is now permanently allowed.
What are the limits?
| Item | 2026 |
|---|---|
| Contribution limit, self-only coverage | $4,400 |
| Contribution limit, family coverage | $8,750 |
| Catch-up contribution, age 55 and older | $1,000 |
| Minimum plan deductible, self-only / family | $1,700 / $3,400 |
| Maximum out-of-pocket, self-only / family | $8,500 / $17,000 |
Contributions for a year can be made until the tax return due date, without extensions — April 15, 2027 for 2026.
How does each business structure handle it?
- Sole proprietor or partner. Contribute personally and deduct on Schedule 1 of Form 1040. The business cannot deduct it as a benefit, and it does not reduce self-employment tax.
- S corporation owner (more than 2 percent). The corporation may contribute, but the amount is added to W-2 box 1 wages (not boxes 3 and 5), and the owner deducts it personally on Schedule 1. The owner cannot make pre-tax salary-reduction contributions through a cafeteria plan.
- C corporation owner-employee. The corporation contributes as a tax-free benefit, excluded from wages entirely.
- Employees. Employer contributions are excluded from wages and payroll tax; employee contributions through a cafeteria plan are also pre-tax. Comparability rules require similar contributions for similarly situated employees unless made through a cafeteria plan.
Why do owners use it as a retirement account?
Unspent balances roll over and can be invested. After age 65, withdrawals for non-medical purposes are taxed as ordinary income with no penalty, like a traditional IRA — and medical withdrawals stay tax-free. Many owners pay current medical costs out of pocket, keep the receipts, and let the account grow, reimbursing themselves years later.
Frequently asked questions
Can I have an HSA if my spouse has a flexible spending account?
Not if the spouse's account is a general-purpose medical FSA that could reimburse your expenses. A limited-purpose (dental and vision) FSA is compatible.
Can an HSA pay health insurance premiums?
Generally no, except COBRA continuation coverage, coverage while receiving unemployment compensation, Medicare and other health coverage at 65 or older (but not Medigap), and qualified long-term care premiums within age-based limits.
What if I contribute too much?
Withdraw the excess and its earnings by the return due date, including extensions; otherwise a 6 percent excise tax applies each year it remains.
Does a mid-year start reduce my limit?
Yes, unless you use the last-month rule — eligible on December 1 lets you contribute the full year, provided you stay eligible through December 31 of the following year (the testing period).
Official sources
The IRS explains: “Under the last-month rule, if you are an eligible individual on the first day of the last month of your tax year (December 1 for most taxpayers), you are considered an eligible individual for the entire year.” — Internal Revenue Service, Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans, https://www.irs.gov/publications/p969
The IRS explains: “For calendar year 2026, the annual limitation on deductions under § 223(b)(2)(A) for an individual with self-only coverage under a high deductible health plan is $4,400. For calendar year 2026, the annual limitation on deductions under § 223(b)(2)(B) for an individual with family coverage under a high deductible health plan is $8,750.” — Internal Revenue Service, Rev. Proc. 2025-19, https://www.irs.gov/pub/irs-drop/rp-25-19.pdf
Next step
Fairlight Accounting handles U.S. domestic, cross-border (U.S.–Canada), and international tax returns, plus bookkeeping, payroll, and CFO advisory. Our U.S. Tax Desk sets up owner and employee contributions so each lands in the right box. See pricing or book a free fit call.
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