Private Medical Practice C-Corp Conversion and Defined Benefit Plan Strategy

The Problem

This four-physician orthopedic surgery practice generated $6 million in annual revenue with net practice income of approximately $2.72 million distributed among the four partners. The practice was structured as an S-Corp, meaning all income passed through to the partners at their individual marginal rates, which exceeded 50% when combining federal (37%), California state (13.3%), and the 3.8% Net Investment Income Tax. The partners were each taking home approximately $680,000 in pass-through income with no meaningful tax planning in place.

The practice had a basic 401(k) plan with a 3% employer match but no defined benefit component, leaving over $2 million annually in income exposed to the highest marginal tax rates. The partners ranged in age from 48 to 57, creating an opportunity for age-weighted plan design. Additionally, the practice was paying for health insurance, disability insurance, and continuing medical education for all four physicians personally rather than through a tax-advantaged corporate structure.

AE Tax Strategy

1. C-Corp Conversion and Fringe Benefit Optimization Under IRC §11 and §105

We converted the practice from an S-Corp to a C-Corp, allowing the practice to deduct health insurance premiums, group term life insurance up to $50,000 per partner, disability insurance, and continuing medical education as corporate expenses under IRC §105, §79, and §162. In a C-Corp, these fringe benefits are deductible by the corporation and excludable from the physician-partners' income, unlike in an S-Corp where greater-than-2% shareholders must include health insurance in W-2 income. The C-Corp flat 21% rate under IRC §11 applied to retained earnings used for practice growth and equipment. Annual fringe benefit tax savings across all four partners: $38,000.

2. Defined Benefit Pension Plan Under IRC §401(a) and §404

We implemented an age-weighted defined benefit plan allowing actuarially determined contributions based on each partner's age and target retirement benefit. The four partners received annual contributions of: Partner A (age 57) — $245,000; Partner B (age 54) — $218,000; Partner C (age 51) — $195,000; Partner D (age 48) — $172,000. Total annual physician contributions: $830,000. Staff received a 5% gateway contribution under nondiscrimination rules. The defined benefit plan deductions reduced taxable income by $830,000 at combined marginal rates averaging 50%, producing annual tax savings of $98,000. The cross-tested plan design maximized partner contributions while minimizing the cost of required staff contributions under IRC §401(a)(4).

3. Management Company for Administrative Services Under IRC §162(a)

We established a separate management LLC to provide billing, coding, compliance, and administrative services to the practice. The management fee structure allowed income splitting and created a deductible expense at the practice level under IRC §162(a). The management entity was used to employ administrative staff and capture additional deductions for office space, technology, and professional services. Annual tax savings from the management company structure: $32,000.

Before & After Comparison

Key Takeaways

• Medical practices with multiple high-income physicians benefit significantly from C-Corp conversion, which unlocks tax-free fringe benefits including health insurance, group term life, disability, and CME that are taxable to greater-than-2% S-Corp shareholders.
• Defined benefit plans allow physician-partners over 50 to contribute $200,000 or more annually on a pre-tax basis, far exceeding the $69,000 limit of defined contribution plans.
• Age-weighted plan designs allocate contributions proportionally to older, higher-compensated partners while satisfying nondiscrimination rules with minimum gateway contributions for staff.
• C-Corp retained earnings taxed at the flat 21% rate can fund practice expansion, equipment purchases, and working capital at substantially lower rates than individual marginal rates exceeding 50% in high-tax states like California.