Entity Structure Comparison
An illustrative, side-by-side estimate of how self-employment tax exposure may differ between operating as a sole proprietor (or single-member LLC) and an S-corporation — using simplified 2024 federal assumptions.
Enter your estimated net business profit and a salary figure you consider reasonable for the S-corp scenario. The tool shows the illustrative federal tax difference. It does not model state taxes, the QBI deduction, payroll costs, fringe benefits, or any other factors. This is educational, not advice.
Illustrative only — not tax advice
This tool uses simplified 2024 federal brackets and a flat SE-tax rate. It does not model QBI deductions, state taxes, NIIT, payroll costs, fringe benefits, S-corp formation and administration costs, or any other deductions. Whether an S-corp structure makes sense depends on your profit level, state rules, payroll administration cost, and many other factors. Consult a CPA before making any entity decision.
How it works
The mechanics of the S-corp SE-tax difference
Understanding what this tool is actually modeling.
Sole proprietor / SMLLC
All net profit is subject to SE tax — 15.3% up to the Social Security wage base ($168,600 in 2024), then 2.9% (Medicare only) above that. Half of SE tax is deductible. The remainder of profit flows to ordinary income tax.
S-corporation
The owner-employee receives a W-2 salary. SE tax (via FICA) applies to the salary only — not to distributions. Remaining profit passes through as a distribution, which is not subject to SE tax but is subject to income tax.
The key constraint
The IRS requires that S-corp owner-employees receive reasonable compensation for their services. Setting the salary too low attracts scrutiny. The 'right' salary depends on your role, industry, and hours — not a formula.
Common questions
Entity structure — what you need to know
What is self-employment (SE) tax and why does it matter for entity choice?
Self-employment tax covers Social Security (12.4%) and Medicare (2.9%) contributions for self-employed individuals — the equivalent of what employers and employees each pay on W-2 wages. For sole proprietors, SE tax applies to 100% of net profit. For S-corp owners, it applies only to the W-2 salary paid by the corporation — not to distributions. This difference is the core of the entity-structure planning question.
Is an S-corp always better from a tax standpoint?
Not necessarily. An S-corp can reduce SE tax exposure when profit materially exceeds a reasonable salary. But it also brings payroll administration costs, state-level filing obligations (some states do not recognize or tax S-corps favorably), and the IRS requirement that the owner-employee receive 'reasonable compensation.' Whether the net benefit is meaningful depends on your profit level, state, and specific facts — a CPA can model the real numbers.
What counts as 'reasonable compensation' for an S-corp owner?
The IRS requires that S-corp owner-employees receive wages comparable to what they would pay an arm's-length employee to perform the same work. There is no bright-line formula — it depends on your role, industry, hours, and the corporation's revenues. Setting the salary too low invites IRS scrutiny. A CPA or compensation study can help establish a defensible figure.
Why doesn't this tool include state taxes or the QBI deduction?
State income taxes vary significantly by state and by entity type — some states have their own S-corp taxes or franchise fees that partially offset federal savings. The §199A QBI deduction can apply to both sole proprietors and S-corps but is subject to income thresholds and limitations. Including these accurately would require your actual facts, not generic assumptions. This tool illustrates the federal SE-tax difference only.
When should I talk to a CPA rather than using this tool?
Any time you are considering an actual entity election, restructuring, or change in compensation. This tool can help you understand the general concept — but the decision involves your specific profit history, state taxes, payroll costs, reasonable-compensation analysis, and timing. We review the actual documents before we propose anything.
Related reading
S-Corp Election strategy page
Plain-English overview of the S-corp election — who it may benefit, the reasonable-compensation requirement, and what it takes to implement correctly.
Get a real analysis, not a calculator estimate.
We review your actual documents — return, income schedules, entity structure — and model what the election actually means for your situation. Whether it helps depends on your specific facts.