1099 physician
tax strategy
Defined Benefit Plan
Understanding income tax vs. payroll tax for high-earning 1099s
An S Corporation (S Corp) is a tax election that can reduce your self-employment (payroll) tax by splitting what you earn into a W2 salary plus business distributions, so you only pay payroll tax on the salary portion, not on the entire 1099 income.
Taxpayers pay two different types of taxes on their income – income tax and payroll tax. While schools, roads, bridges, parks, and police/fire/EMS, and all the good things that you usually associate with taxes are generally paid for by property or sales tax, income taxes mainly pay for federal and state politicians to waste and maintain 90% incumbency rates, but I digress. In addition to your income tax, you also pay for Social Security and Medicare.
These taxes are taken directly out of your paycheck if you are a W2 employee at a fixed rate, separate from your income tax. They are also referred to as FICA taxes, or if you are 1099 or self-employed, self-employment taxes. As a W2 employee, 7.65% of your wages are withheld as payroll tax up to a certain amount, and your employer pays another 7.65% (which you don’t see – your employer pays it behind the scenes, so to speak). If you are 1099/self-employed, you pay the entire payroll tax, both the employer and employee portions. So, taxes for 1099 physicians are a little higher up front than for W2 employees. Here’s where the S Corporation comes into play.
When you operate as a sole proprietor or single-member LLC taxed as a sole proprietorship, your business profit is generally subject to self-employment tax in addition to income tax. Self-employment tax includes both Social Security and Medicare taxes—a combined 15.3% rate on earnings up to the Social Security wage limit. Once you exceed that limit, the Social Security portion drops off, but the 2.9% Medicare tax continues, and higher earners may also owe an additional 0.9% Medicare tax. For a physician earning $300,000 of net self-employment income, these taxes alone can add up to tens of thousands of dollars each year.
The key is understanding that income tax and payroll tax are separate systems. Income tax is based on your total taxable income and deductions. Payroll taxes fund Social Security and Medicare and are based on wages or self-employment earnings. You can’t avoid income tax with an S Corp, but you can change how much of your income is exposed to payroll tax.
For example, a 1099 physician netting $250,000 as a sole proprietor pays self-employment tax on the full $250,000. If that same physician instead routes the income through an S Corp and pays a $150,000 salary plus $100,000 in distributions, the payroll tax applies only to the $150,000 salary. The $100,000 distribution still counts as income for income tax purposes, but it is not hit with the 15.3% self-employment tax.
This distinction is why the S Corp has become such a common planning tool for high-income self-employed professionals, especially physicians with stable six-figure 1099 income. The structure does not change the nature of what you do day-to-day, but it significantly changes how the tax code treats your earnings.
How S corporation status changes self-employment tax for physicians
An S Corp is not a separate legal entity but a tax designation you elect for your LLC, PLLC, PC, or PA, allowing part of your 1099 income to be reclassified as distributions that are not subject to payroll (self-employment) tax.
While LLCs filing as sole proprietors do not offer any tax benefits, electing to be treated as an S Corporation (S Corp) allows for savings on the self-employment tax. Note that S Corps are not entities, but rather tax designations – you must have an LLC/PLLC/PC/PA to elect to be taxed as an S Corp. Also note that S Corps do not offer income tax savings, but rather payroll/self-employment tax savings. As an S Corp, you are essentially treating yourself like an employee of your company. Your S Corp must pay you a reasonable salary as a W2 wage. The difference between what you earn as a 1099 (your company’s Gross revenue) and what your company pays you (your reasonable salary) is treated as a business distribution and is not subject to payroll tax. In this manner, S Corps usually save the average physician $5-10k per year in payroll tax, though this varies depending on income level.
In practice, this means you create a clear separation between you as an individual and you as the owner-employee of your professional entity. Your 1099 income is paid to the entity, not directly to you. The entity then runs payroll and pays you a salary. Anything above that salary, after expenses, can be distributed to you as owner distributions.
The IRS requires that your salary be “reasonable.” For physicians, reasonable usually means what another physician in your specialty, geography, and workload would earn as a W2 employee. If your S Corp nets $400,000 and you try to pay yourself only $50,000 in salary with $350,000 in distributions, that will almost certainly not pass muster in an audit.
For many high-income physicians, a reasonable salary often falls somewhere between 40% and 70% of net business income, with the remainder taken as distributions. The right percentage depends on your specialty, how much you work, regional compensation data, and your risk tolerance. A cardiologist working full-time in a high-cost metro area will generally justify a higher salary than a part-time pediatric physician.
Consider a simplified example. If you net $350,000 from locums work through an S corporation and pay yourself a reasonable salary of $200,000, payroll taxes apply to that salary. The remaining $150,000 may generally be taken as an S corporation distribution and is not subject to Social Security and Medicare payroll taxes.
This is intentionally rough math meant to illustrate the concept, not a real-world tax calculation or recommendation. Actual savings depend on factors such as your reasonable salary, filing status, other earned income, and where your earnings fall relative to the Social Security wage base and Additional Medicare Tax thresholds.
These savings are not unlimited, and they come with responsibilities. You must actually run payroll, remit taxes, and file the right forms. But when implemented correctly, the S Corp structure can be a powerful tool for keeping more of what you earn as a high-income 1099 physician while staying squarely within the rules.
Practical payroll, withholdings, and compliance for S corps
With an S Corp, you pay yourself through payroll, make tax payments through employer withholding accounts, and file recurring federal and state reports, often with the help of a payroll service or advisory firm.
Whereas sole proprietors pay taxes as estimated tax payments directly to the federal and state governments, employers pay taxes as “Withholdings.” To make a tax payment this way, you first must have Federal and State employer Withholding accounts, and whenever the company pays you a salary, you must calculate the payroll tax on the salary and pay any anticipated Federal or State tax owed as withholdings through the employer Withholding accounts. In addition, S Corps and other employers must file quarterly reports with the federal and state governments, such as Forms 941 and 940. This is what payroll companies do – they calculate and pay payroll tax, withhold and pay Federal and State taxes, file various required reports throughout the year, and deliver funds to employees as direct deposits or paper checks.
From a practical standpoint, this means moving from a world where you write a quarterly check to the IRS to a world where taxes are automatically withheld each time your S Corp runs payroll. For many physicians, this actually feels more familiar, because it mirrors how taxes worked when you were purely a W2 employee.
You will need to register for federal and state employer unemployment and withholding accounts, set up a system to run payroll, and stay current with filing deadlines. Federal Form 941 is used to report quarterly federal payroll taxes, Form 940 covers federal unemployment tax, and most states have their own quarterly and annual reports. Missing these filings can result in penalties that quickly erode any tax savings.
Because of this complexity, most physicians do not try to run S Corp payroll manually. Instead, they work with a payroll company or an advisory firm that handles everything behind the scenes – calculating withholdings, initiating tax payments, filing returns, and issuing W2s at year end. This allows you to focus on clinical work while still capturing the payroll tax benefits of the S Corp structure.
It is also important to coordinate S Corp planning with your broader financial and retirement strategy. Your salary level affects how much you can contribute to retirement plans like a 401(k) or defined benefit plan, as well as how much shows up as earned income for Social Security and Medicare purposes. Before making changes, you should review your situation with your CPA and financial advisor to ensure the S Corp election fits with your long-term goals and state-specific rules.
None of this is about exploiting loopholes or playing aggressive games with the IRS. It is about understanding how the tax code treats different types of income and using legitimate structures, like an S Corp, to align your business with the rules in a way that is both tax-efficient and fully compliant.