Mental health professionals running their own private practices share a financial profile that often hides real tax opportunity. Most operate as sole proprietors or single-member LLCs and never have the entity structure or retirement plan optimization analysis done. The numbers are usually larger than the practitioners realize.
- S-corp election can save material payroll tax once net practice income exceeds roughly $80,000 — but the analysis depends on reasonable comp and overall income.
- Solo 401(k) plans allow up to $69,000 in 2024 ($76,500 if age 50+) — far more than a SEP IRA at the same income level.
- Cash balance plans paired with a 401(k) can defer $200,000+ annually for high-income solo practitioners, especially those age 45+.
- California professional corporation (PC) status is required for licensed mental health professionals running a practice — sole-prop or generic LLC may not be appropriate.
- 1099 clinician arrangements face AB 5 scrutiny — classification matters more in California than most clinic owners realize.
When to elect S-corp
Sole proprietors and single-member LLCs pay self-employment tax (15.3%) on all net earnings. S-corporations split owner compensation between W-2 wages (subject to payroll tax) and distributions (not). When net practice income comfortably exceeds reasonable comp for the role, the S-corp election starts saving real money on payroll tax.
Reasonable compensation must be defensible. For a Bay Area solo therapist netting $200K, reasonable W-2 might be $110-130K; the rest can flow as distributions. The savings on the distribution portion (~15% of that amount) adds up.
Retirement plan options, ranked by leverage
SEP IRA — Up to 25% of compensation, capped at $69,000 (2024). Simple to administer but the 25% cap limits contributions for solo practitioners.
Solo 401(k) — Up to $23,000 employee deferral + 25% employer contribution, total cap $69,000. The dual-contribution structure means a solo practitioner can hit the cap at a much lower income than with a SEP.
Cash Balance Plan — A defined benefit plan that allows much larger contributions, particularly for older practitioners. A 50-year-old solo therapist can sometimes defer $150K+ annually through a cash balance plan alone.
Combined Cash Balance + Solo 401(k) — Stacked correctly, can defer $200K+ annually. Requires actuarial setup and ongoing administration but the tax leverage is substantial.
Professional Corporation requirements in California
California licensed mental health professionals (LCSW, MFT, psychologists, psychiatrists) running a practice must use a Professional Corporation structure, not a generic LLC. The PC structure has specific Board of Behavioral Sciences requirements around ownership, naming, and shareholder eligibility.
AB 5 and 1099 clinicians
Group practices that contract with clinicians as 1099 independent contractors face AB 5 classification risk in California. The ABC test is strict, and the consequences of misclassification include back wages, payroll tax, penalties, and potential class-action exposure.
Frequently Asked Questions
When should I form a PC vs. continue as a sole proprietor?
California licensed mental health professionals running a practice are generally required to operate as a Professional Corporation (PC) — not a generic LLC. Sole proprietorship is possible for solo practitioners but does not provide the liability protection or tax planning flexibility of a PC. Most practitioners should be in a PC by the time net income exceeds $80K.
Is a cash balance plan right for a solo practice?
Cash balance plans work best for solo practitioners or small group practices where the owner is 45+, has consistent high income ($200K+), and wants to defer significantly more than a solo 401(k) alone allows. Setup involves actuarial design and annual administration but the tax leverage is substantial.
What is reasonable comp for a therapy practice S-corp?
Reasonable compensation must reflect what you would pay an arms-length professional to do the work — including credentials, hours, and complexity. For Bay Area solo therapists, this typically lands $110-150K depending on specialty and panel mix. Documenting the reasoning matters.
How does AB 5 apply if I just have one contract clinician?
Even a single 1099 clinician faces AB 5 scrutiny in California. The B prong (the work is outside the usual course of business) is the hardest to meet for a therapy practice hiring a therapist. The professional services exemption has narrow eligibility conditions that most informal arrangements do not satisfy.
Should I keep separate trust accounts for client funds?
Mental health practices generally do not handle client trust funds the way law firms do. But if you collect deposits or pre-payments for sessions, separating those from operating funds is a best practice for both accounting clarity and consumer protection compliance.
Optimizing your practice structure?
We work with Bay Area mental health practitioners on entity structure, retirement plan design, and tax optimization. A complimentary 30-minute consultation walks through your specific situation.
Active member of the AICPA and CalCPA. Tax strategy and advisory for Bay Area business owners, real estate investors, and high-net-worth families.
This article is for general information and does not constitute tax, legal, or investment advice. Individual situations vary; please consult a CPA before making tax elections. Milestone CPAs is licensed in California and serves clients across the Bay Area and Tri-Valley.
