S-Corp for Doctors: How Physicians Cut Their FICA Tax Bill | SDO CPA

S-Corp for Doctors: How Physicians Can Cut Their FICA Tax Bill

Most physicians pay $20,000–$50,000 more in FICA taxes than they have to. Not because they’re doing anything wrong, but because they’re still operating as a sole proprietor or single-member LLC — structures that expose every dollar of net income to self-employment tax.

The S-Corp for doctors is the most common tax move for physicians earning $200,000 or more in self-employment income. It works by splitting your income into two buckets: a W-2 salary and distributions. Only the salary is subject to FICA taxes. Distributions aren’t. That gap is where the savings live.

This isn’t a loophole. The IRS recognizes S-Corps as a legitimate structure. The compliance requirements are real, and the reasonable compensation rules have teeth. But for the right physician, the math works clearly in your favor.

Should doctors have an S-Corp?

If you’re a physician earning more than $200,000 in net self-employment income, an S-Corp election can reduce your FICA tax bill by paying yourself a reasonable W-2 salary and taking the rest as distributions. Distributions aren’t subject to Social Security or Medicare taxes. At $400,000 in net income with a $150,000 salary, the potential savings can reach $10,000–$20,000+ per year depending on your income level and salary determination. But the S-Corp isn’t right for everyone — the compliance costs matter.

Key Takeaways

• S-Corps split income into salary and distributions — only salary is subject to FICA taxes; distributions are not
• Physicians earning $200K+ in net SE income typically see positive ROI from an S-Corp structure once compliance costs are factored in
• The 2026 Social Security wage base is $184,500 — earnings above this already avoid Social Security tax on W-2 wages
• Reasonable compensation is the biggest audit risk — you can’t pay yourself $1 to dodge FICA; the IRS will reclassify it
• Form 2553 deadlines are strict — file within 75 days of entity formation, or by March 15 for an existing entity converting mid-stream
• An S-Corp requires real infrastructure — business bank account, payroll, quarterly 941 filings, and an annual Form 1120-S

How S-Corps Cut FICA Taxes for Physicians

Here’s the core mechanism. When you’re self-employed — as a solo practice owner, locum tenens contractor, or partner in a group practice receiving guaranteed payments — your net income is subject to self-employment tax at 15.3%. That breaks down to 12.4% for Social Security (up to the $184,500 wage base in 2026) and 2.9% for Medicare on all earnings. Above $200,000 (single filers) or $250,000 (married filing jointly), an additional 0.9% Medicare surtax applies.

With an S-Corp, you elect to be treated as an employee of your own company. You pay yourself a W-2 salary — and FICA applies to that salary. The remaining profit flows to you as a distribution, which isn’t subject to FICA. That’s the entire structure in a sentence.

The savings are real, but they’re not uniform. Here’s how the math looks across different income levels:

Savings are approximate and depend on your specific salary determination, state taxes, and other factors. Your CPA should model the actual numbers for your situation.

One clarification: Medicare tax (2.9%) applies to all wages regardless of the wage base, so the strongest savings come from the Social Security portion on income between your reasonable salary and $184,500. Above that threshold, the SS portion disappears for both salary and distributions, which affects the math at higher income levels.

What Counts as Reasonable Compensation for Physicians?

This is where most S-Corp mistakes happen. The IRS requires that you pay yourself a “reasonable” salary — meaning what you’d pay someone else to do the same work. For physicians, that’s grounded in actual market data, not a number you pick because it minimizes taxes.

Factors the IRS looks at include your specialty, hours worked, geographic market, and productivity measures like wRVUs (work relative value units). MGMA publishes annual benchmark data that serves as a starting point for physician reasonable compensation analysis. We don’t recommend citing specific MGMA percentiles as a target without context, because the right number depends on your situation — but you need a defensible methodology.

If the IRS determines your salary was unreasonably low, they can reclassify your distributions as wages. That means back FICA taxes, plus interest and penalties. SDO analyzes IRS reasonable compensation requirements using current benchmark data for each client’s specialty and market.

The goal isn’t to minimize your salary as much as possible. It’s to pay yourself a defensible, market-rate salary — and let the rest flow as distributions.

When S-Corp Makes Sense for Doctors (and When It Doesn’t)

The S-Corp structure fits certain situations well and fits others poorly. Here’s a quick framework:

The compliance costs are real: payroll processing, quarterly payroll tax filings, an annual Form 1120-S, and often higher accounting fees. For most physicians above $200,000 in net SE income, those costs are a fraction of the FICA savings. Below that threshold, the math gets tighter.

Forming an S-Corp for Your Medical Practice

There are two paths to an S-Corp for physicians. You can form a PLLC (Professional Limited Liability Company) or a PC (Professional Corporation) first, then file Form 2553 to elect S-Corp tax treatment. Or you can incorporate directly as an S-Corp in states that allow it. Which path makes sense depends on your state’s professional licensing rules.

For a deeper look at the entity type decision, see PLLC vs PC for doctors.

Here’s the general timeline once you’ve chosen an entity type:

1. Form your PLLC or PC with your state’s Secretary of State
2. Obtain an EIN from the IRS
3. File Form 2553 S-Corp election within 75 days of entity formation, or by March 15 of the tax year you want the election to apply
4. Set up payroll and process your first W-2 salary payment
5. Open a dedicated business bank account — no commingling personal and business funds
6. File quarterly payroll taxes using Form 941
7. File your annual Form 1120-S by March 15

Missing the Form 2553 deadline is a common and painful mistake. If you form an entity in October and don’t file within 75 days, you’re operating as a disregarded entity for that tax year. The IRS does allow late election relief in some cases, but it’s not guaranteed.

For IRS guidance on entity classifications, see the IRS S-Corporations overview and the IRS Form 2553 page.

S-Corp vs. Solo 401(k): A Hidden Benefit

The FICA savings are the headline, but there’s a second benefit physicians often miss. S-Corp owners can contribute to a solo 401(k) — and the limits are substantial.

In 2026, the combined employee and employer contribution limit is $72,000 (subject to annual adjustment). As an S-Corp owner, you contribute as both an employee (up to the elective deferral limit) and an employer (up to 25% of W-2 compensation). Both contributions come out of pre-tax income, which lowers your taxable income further.

When you stack the FICA savings with a maximum solo 401(k) contribution, the combined tax impact can be significant. A physician taking a $150,000 W-2 salary and contributing $72,000 to a solo 401(k) reduces their taxable income by $72,000 while avoiding FICA on $250,000 in distributions.

See our S-Corp 401(k) guide for a full breakdown of how the contribution math works.

Common S-Corp Mistakes Physicians Make

These are the errors we see most often when physicians set up their own S-Corps or use a general-purpose accountant who isn’t familiar with physician-specific compliance:

1. Paying yourself too low a salary. This is the biggest IRS red flag. If your salary is materially below MGMA benchmarks for your specialty, you’re inviting scrutiny.
2. Missing the Form 2553 deadline. You can’t retroactively elect S-Corp status for a year that’s already passed without following the late election procedures — and those aren’t always approved.
3. Commingling personal and business funds. The S-Corp is a separate legal entity. Depositing 1099 income into your personal account or paying personal expenses from the business account creates problems.
4. Not actually running payroll. You can’t just write yourself a check and call it a W-2. You need a payroll system, withholding, and quarterly filings.
5. Forgetting state S-Corp elections. Some states — including New Jersey and New York — require a separate state-level election. Texas doesn’t have an income tax, but if you practice in multiple states, this matters.
6. Setting up health insurance incorrectly. S-Corp owners who are more-than-2% shareholders must have their health insurance premiums run through payroll and added to W-2 wages before taking the self-employed health insurance deduction. Doing this wrong costs you the deduction.

Frequently Asked Questions

Can any physician form an S-Corp, or are there restrictions?

Most physicians can, but state professional licensing rules apply. Some states require physicians to use a Professional Corporation (PC) rather than an LLC, which affects the formation path. A few states restrict S-Corp elections for PCs. Check your state medical board rules and consult a CPA familiar with physician entity structures before forming.

What’s the difference between an S-Corp and a PLLC?

A PLLC is a state law entity — it defines your liability protection and ownership structure. An S-Corp is a federal tax election. Most physician S-Corps are actually PLLCs (or PCs) that have elected S-Corp tax treatment by filing Form 2553. The terms are often used interchangeably, which causes confusion.

Does a physician S-Corp protect me from malpractice lawsuits?

No, not meaningfully. Professional liability for malpractice generally pierces entity protection — you remain personally liable for your own negligence regardless of entity type. The S-Corp is a tax structure, not a malpractice shield. Your malpractice insurance policy is what protects you clinically.

Can a locum tenens doctor benefit from an S-Corp?

Yes, and it’s often a strong fit. Locum physicians typically earn $300,000–$600,000+ in 1099 income with few practice overhead expenses, which means a large portion of net income is exposed to SE tax. An S-Corp structure can capture meaningful FICA savings in this scenario. The entity travels with you across contracts.

What happens if I miss the S-Corp election deadline?

If you miss the 75-day window after formation, the entity defaults to its classification under state law — usually a disregarded entity or partnership. You can request late election relief by filing Form 2553 with a statement explaining reasonable cause. The IRS approves many late elections, but it’s not automatic. For existing entities, you can elect S-Corp treatment effective January 1 of the next year by filing Form 2553 by March 15.

Do I need an accountant to maintain an S-Corp?

You need at minimum a payroll service and a CPA for the annual 1120-S. The 1120-S is not a return most physicians should prepare themselves — it requires proper allocation of income, basis tracking, and accurate W-2 preparation. The cost of CPA-maintained compliance is typically far less than a single year of IRS penalties for a poorly filed return.

Talk to a CPA About Your S-Corp Strategy

For physician tax planning, the S-Corp decision isn’t a one-size-fits-all answer. It depends on your current net income, your specialty’s reasonable compensation benchmarks, your state, your retirement planning goals, and whether you have or plan to bring on partners.

SDO analyzes physician entity structures by looking at your current income, projected growth, and the reasonable compensation range for your specialty and market. We use MGMA benchmark data and model the actual FICA savings against your specific compliance costs — so you know whether the structure pays for itself before you set it up.

Our S-Corp tax services cover formation guidance, election timing, payroll setup coordination, and ongoing 1120-S preparation. You can also use our S-Corp tax calculator to run a quick estimate of your potential savings.

If you’re earning $200,000+ in self-employment income and haven’t looked at this structure, the question isn’t whether you should consider it — it’s how much the delay has already cost you.

Schedule a physician tax consultation to get a clear picture of what an S-Corp could mean for your tax bill.