The most common reason owners look at an S corporation is self-employment tax. The reasoning is straightforward, but the actual result depends on several inputs, so it is worth walking through a simplified example and then discussing what the example leaves out. The figures below are hypothetical and rounded, and they are not a prediction for any business.
How Self-Employment Tax Works
A sole proprietor or disregarded LLC owner generally pays self-employment tax on net earnings from the business. The calculation applies to 92.35 percent of net earnings, and the combined rate is 15.3 percent, made up of 12.4 percent for Social Security and 2.9 percent for Medicare. The Social Security portion applies only up to an annual wage base that is adjusted each year, while Medicare continues above it. Higher earners may also owe an Additional Medicare Tax of 0.9 percent above certain thresholds.
How an S Corporation Changes the Base
In an S corporation, an owner who performs services is treated as an employee and must receive reasonable compensation. Payroll taxes apply to that salary, at the same 15.3 percent combined employer and employee rate up to the wage base. Profit beyond the salary passes through to the owner's personal return as ordinary income and is generally not subject to payroll tax. That is the source of any savings.
A Simplified Example
Suppose a business has 150,000 dollars of net profit, and the owner works full time in it. Assume a reasonable salary of 70,000 dollars. The comparison looks like this:
| Item | Sole proprietor | S corporation |
|---|---|---|
| Base for employment tax | 138,525 (92.35% of 150,000) | 70,000 salary |
| Employment tax at 15.3% | about 21,194 | 10,710 |
| Gross difference | about 10,484 | |
| Assumed added annual costs | 3,000 | |
| Illustrative net difference | about 7,484 |
The added costs in the table are an assumption covering payroll service fees, a separate tax return, and state charges. Your costs could be lower or higher.
What the Example Leaves Out
Several factors can move the result in either direction:
- Income tax effects. Half of self-employment tax is deductible on the personal return, and the employer share of payroll tax is deductible at the business level. These offsets narrow the gap somewhat.
- Qualified business income deduction. Lower reported wages can increase qualified business income, but wage-based limits apply to some owners, so the interaction needs to be modeled. See The Qualified Business Income Deduction (Section 199A).
- Retirement contributions. Lower salary can mean lower contribution capacity for plans based on compensation.
- State taxes. Some states charge minimum taxes or fees on S corporations, and a few do not follow the federal treatment.
- Health insurance and fringe benefits. Shareholder-employee rules change how some benefits are reported.
- Reasonable compensation risk. If the salary is challenged and increased, the savings shrink and penalties may apply.
Why the Percentage Savings Shrink at Higher Income
Because the Social Security portion stops at the wage base, high earners pay the 12.4 percent piece on only part of their income under either structure. As profit rises, the incremental benefit of shifting profit out of the payroll base is mainly the 2.9 percent Medicare piece, plus any Additional Medicare Tax exposure on wages. That is why the benefit is often described as flattening at higher profit levels, even though the dollar amount may remain meaningful.
Any quoted savings figure is only as good as its assumptions. Ask for the assumptions, not just the answer.
When the Answer May Be No
If profit is modest, if a reasonable salary would consume most of it, or if your state imposes significant entity-level charges, the election may not pay for itself. Businesses with high growth needs may also prefer to keep cash in the company, which affects the analysis. For a broader look at structure, see Choosing an Entity Structure at Higher Income Levels.
A Practical Next Step
Gather the last two years of returns, a current-year profit forecast, and your payroll history if any. Ask your advisor to model your own numbers under the current structure and under an S corporation, including federal and state effects and the added costs. Then decide whether the difference justifies the ongoing compliance.
How to Pressure-Test a Savings Estimate
If someone gives you a savings number, ask a few follow-up questions. What salary was assumed, and where did the salary figure come from? Were state taxes included? Were the added payroll and filing costs deducted? Was the qualified business income deduction modeled before and after? Did the estimate assume the same profit in both structures? A credible estimate should let you trace each of these inputs. If it cannot, treat it as a rough marketing figure rather than a planning number.
You can also run a sensitivity check by testing a higher salary. If the case for the election disappears when the salary rises modestly, the decision is fragile and deserves more thought. If it holds across a reasonable range, it is more robust.
Frequently Asked Questions
Is the S corporation savings guaranteed?
No. It depends on your profit, your reasonable salary, your state, and how well the business follows payroll and record-keeping requirements.
Do S corporation owners still pay Social Security and Medicare taxes?
Yes, on the salary they receive. Distributions above salary are generally not subject to those taxes, but they are subject to income tax.
Want to See How This Applies to Your Business?
Book a discovery call with AE Tax Advisors to talk through your entity, compensation, retirement, and deduction planning.
Book a Discovery CallEducational purposes only. This page is general education and is not tax, legal, or accounting advice. Tax laws change and outcomes depend on individual facts, so consult a qualified professional before acting. No result is guaranteed.