Health Savings Account (HSA) Strategy for Small Business Owners

HSA rules for 2025:

Eligibility:

• Must be enrolled in a high-deductible health plan (HDHP)
• HDHP minimum deductible: $1,650 (self-only), $3,300 (family)
• HDHP maximum out-of-pocket: $8,300 (self-only), $16,600 (family)
• Cannot be enrolled in Medicare
• Cannot be claimed as a dependent on another person’s return
• Cannot have non-HDHP coverage (with limited exceptions for dental, vision, and specific-disease policies)

Contribution limits (2025):

• Self-only: $4,300
• Family: $8,550
• Catch-up (age 55+): additional $1,000
• Employer contributions count toward the limit
• Contributions can be made until the tax filing deadline (April 15)

Tax treatment:

• Deduction: above-the-line deduction (reduces AGI). Sole proprietors deduct on Form 1040. S-Corp owners cannot contribute through payroll (see below), but can contribute personally and deduct.
• Growth: investment gains, dividends, and interest inside the HSA are not taxable
• Withdrawals for qualified medical expenses: tax-free (no income tax, no penalties)
• Withdrawals for non-medical expenses: taxable as ordinary income + 20% penalty (penalty waived after age 65 or disability, but income tax still applies)

S-Corp owner trap: An S-Corp shareholder who owns more than 2% cannot participate in the company’s HSA plan on a pre-tax basis. Employer contributions to a 2%+ shareholder’s HSA are included in the shareholder’s W-2 wages (Box 1, but not Boxes 3 or 5). The shareholder deducts the contribution on their personal return as an above-the-line deduction. The net effect is the same (deductible), but the mechanism is different from rank-and-file employees.

HSA as a stealth retirement account: After age 65, HSA withdrawals for non-medical expenses are taxed as ordinary income (no 20% penalty). This makes the HSA function like a traditional IRA after age 65. But for medical expenses, withdrawals remain tax-free at any age. Given that the average couple spends $315,000+ on healthcare in retirement (Fidelity estimate), the HSA’s medical withdrawal benefit is extremely valuable.

Investment strategy: Most HSA custodians offer investment options (index funds, target-date funds). The optimal strategy for business owners who can afford to pay medical expenses out of pocket:

1. Contribute the maximum ($8,550 family)
2. Invest the full balance in index funds
3. Pay current medical expenses out of pocket (not from the HSA)
4. Keep receipts for all medical expenses paid out of pocket
5. Years or decades later, withdraw from the HSA tax-free to reimburse those expenses (there is no time limit on reimbursement under IRC 223, only that the expense occurred after the HSA was established)
6. The investments grow tax-free for the entire period