S-Corp Election Tax Savings Calculator for Physicians

If you earn 1099 income as a locum tenens physician, hospitalist, or private practice owner operating as a sole proprietor or single-member LLC, you pay self-employment tax (15.3%) on every dollar of net earnings. Electing S-corp tax treatment lets you split that income into a W-2 salary — on which FICA applies — and owner distributions, which are not subject to employment tax. For a physician netting $300K–$700K of 1099 income, that gap is typically $10K–$30K in annual tax savings.

This calculator uses 2026 FICA rates and the $184,500 Social Security wage base.⁴

Why the S-corp election matters for physicians

Self-employment tax funds Social Security and Medicare. As a sole proprietor or single-member LLC, you pay it on your entire net 1099 or practice income — 15.3% on the first $184,500 of SE-adjusted income, 2.9% above that, plus a 0.9% surtax above $200K (single) or $250K (married).¹

An S-corp changes the structure. You pay yourself a W-2 salary (FICA applies to that salary). The remaining profit flows out as an owner distribution — which is not subject to FICA. The IRS requires the salary to be "reasonable compensation" for the services you perform, but everything above that benchmark is distribution income at zero employment-tax cost.²

What counts as "reasonable compensation" for a physician?

The IRS does not publish a table. Their standard is the amount a comparable business would pay for similar services in similar circumstances.² For physicians, the most defensible benchmarks are:

• MGMA or AMGA salary survey data for your specialty and region. If you're a hospitalist in the midwest, MGMA median hospitalist compensation is around $300K–$350K. Your W-2 salary should be in that range — you can't pay yourself $90K on a $600K net and expect to survive an audit.
• The cost to hire a locum or employed physician to replace you. If a staffing agency would bill $200/hr for a locum covering your shifts, 2,000 hours of clinical work implies ~$400K of reasonable comp. Very-high-net physicians have the hardest time reducing their salary below market.
• Part-time or mixed income adjustments. If 40% of your income is non-clinical (administrative, speaking, consulting), only the clinical portion needs to be benchmarked at physician rates. This is common for physician executives or medical directors — and it's legitimate.

The IRS scrutinizes token salaries. Paying yourself $60K on $600K of net income is a red flag. A documented $160K–$220K salary on $400K–$600K net income for most specialties is defensible — build a compensation memo with your title, duties, hours, and the MGMA or BLS data used to set the amount.

Physician-specific considerations

Locum tenens physicians. Locum income is already 1099 — you're already effectively self-employed. Wrapping your locum business in an S-corp is often the single highest-value tax move available to you. Combine it with a solo 401(k) (up to $70,000 contribution limit in 2026 including employer match) and you can shelter a substantial portion of earnings from both FICA and income tax. See our locum tenens financial planning guide for the full picture.

Private practice physicians. If you own your practice as a sole prop or SMLLC, the S-corp election works identically to the locum tenens case. The "reasonable comp" analysis is more straightforward — compare to MGMA employed compensation in your specialty. Don't conflate business overhead with personal income when setting the base.

The solo 401(k) interaction. When you elect S-corp, your solo 401(k) employee deferral is based on W-2 salary. The employer profit-sharing contribution is 25% of W-2 comp. At high income levels, this combination often outperforms the sole-prop structure anyway — the retirement account tax deduction frequently exceeds the QBI or FICA differential. See the full physician tax strategy guide for integrated modeling.

What the calculator doesn't include

• State payroll taxes. California, New York, and a handful of other states impose SDI or UI taxes on W-2 wages that add modestly to total cost.
• QBI deduction interaction. Under OBBBA (effective 2025), the §199A QBI deduction is permanent at 23% for pass-through income. W-2 salary reduces your QBI-eligible income, partially offsetting FICA savings. For most physicians this interaction is small, but it's worth modeling — especially above the §199A SSTB phase-out thresholds.
• Solo 401(k) contribution changes. Shifting from sole prop to S-corp changes the base for your solo 401(k) employee deferral and employer match. This usually still favors the S-corp structure at high income, but it must be modeled together with the FICA analysis.
• One-time setup cost. Converting a sole prop or SMLLC to S-corp treatment requires filing Form 2553 and potentially restructuring your entity. Budget $1K–$3K one-time, separate from ongoing admin.

Who it makes sense for

The S-corp election is generally worth the admin burden when net 1099/practice income exceeds roughly $80K–$100K above your reasonable salary. Below that spread, gross FICA savings may not cover admin costs.

Estimates use MFJ filing status and $2,500 admin costs. Gross savings only — enter your numbers above for a precise figure.

How to elect S-corp status

1. Confirm eligibility. S-corp election is available to sole proprietors, single-member LLCs, and C-corps with 100 or fewer shareholders. Professional corporations (PCs) and PLLCs in most states can elect S-corp treatment — no need to form a separate entity if you already have one.
2. File Form 2553. The IRS election form. For a calendar-year practice, file by March 15 to be treated as an S-corp for the entire current year. Late elections are available in many circumstances under Rev. Proc. 2013-30.³
3. Set up payroll. You must actually run payroll at your reasonable salary — federal withholding, FICA deposits, Form 941 quarterly, and W-2 at year-end. Gusto and ADP handle physician-practice payroll for $50–$100/month.
4. Document reasonable comp. A memo in your corporate records: your title, clinical duties, weekly hours, and the MGMA or BLS market data used to set your salary. Update it annually.
5. Coordinate with your advisor and CPA. S-corp basis tracking, estimated tax recalibration, 401(k) contribution changes, and QBI optimization all need to be modeled together. A physician-specialist advisor can run the full analysis.