How S-Corp Tax Bifurcation Works
When you operate as a sole proprietor, every dollar of net self-employment income flows straight to Schedule SE. The IRS collects 15.3% self-employment tax before your income tax bracket even enters the picture — 12.4% for Social Security (on net income up to $184,500) and 2.9% for Medicare on all net income. On $120,000 net profit, that's $16,590 in SE tax before you pay a cent of income tax.
An S-Corporation restructures that flow. Instead of all $120,000 being subject to SE tax, the S-Corp pays you a W-2 salary — say $72,000 at a 60/40 split — and distributes the remaining $48,000 as a shareholder distribution. FICA applies only to the salary. The distribution passes through to your personal return entirely free of payroll tax. That $48,000 at 15.3% is $7,344 in gross savings. Whether that survives overhead is what this guide covers.
Distribution = Net Profit × 0.40
FICA only on salary
Simplified for illustration. Actual SE tax computed on 92.35% of net profit. SS capped at $184,500 net SE income. Not tax advice.
The $80,000 Net Income Threshold
The $80,000 figure represents the approximate net profit at which the gross SE tax savings from bifurcation begins to meaningfully exceed the annual cost of maintaining an S-Corp structure — typically $2,000–$4,500 per year for CPA fees, payroll software, and state compliance. Below that, the math is marginal at best.
California imposes an $800 minimum franchise tax plus a 1.5% CA S-Corp tax on net income — meaningfully raising your overhead floor. New York has its own filing fee schedule. Some states don't recognize the federal election at all. Confirm your state's treatment with a local CPA before electing.
Side-by-Side Breakdown: $120,000 Net Income
How the numbers compare for a contractor at $120,000 net self-employment income — sole proprietor vs. S-Corp with a 60/40 salary-to-distribution split.
| Line Item | Sole Proprietor | S-Corp (60/40) |
|---|---|---|
| Net Income | $120,000 | $120,000 |
| W-2 Salary Paid | — | $72,000 |
| Shareholder Distribution | — | $48,000 |
| SE / Payroll Tax (15.3%) | −$16,590 | −$9,953 |
| Gross SE Tax Savings | — | +$6,637 |
| Annual Admin Overhead (est.) | −$300 | −$3,500 |
| Est. Net Annual Savings | Baseline | +$3,137 |
| SE tax estimated at 15.3% on 92.35% of net income for sole proprietor. S-Corp payroll tax applied to salary only. Admin overhead is illustrative. Not tax advice. | ||
IRS "Reasonable Compensation" — The Rule You Can't Ignore
The S-Corp strategy only works if you follow one firm IRS requirement: you must pay yourself a reasonable salary for the work you perform before taking any distributions. The IRS designed this requirement specifically to prevent shareholders from artificially eliminating payroll taxes by taking all income as distributions.
"Reasonable compensation" is what you'd pay an arm's-length employee to do the same work. No hard IRS formula exists, but courts have considered the nature of the work, comparable market wages, time devoted, and what the business earns. The most common rule of thumb for single-owner service businesses is a 60/40 split: 60% of net profit as salary, 40% as distributions. The key is a documented, defensible rationale — not $1 in salary with $199,999 in distributions.
Look up the BLS median wage for your role, or use 60% of your projected net profit as a starting point. Document the rationale in writing — ideally in a board resolution — and revisit it every year as your income changes.
What S-Corp Administration Actually Costs
The overhead is real and recurring. Budget for these every year — not just year one.
Common Mistakes When Electing S-Corp Status
An S-Corp election is a multi-year administrative commitment. Before electing, confirm your net income comfortably clears $80,000, your state doesn't impose taxes that wipe out the benefit, and you have a CPA experienced with pass-through entities ready to handle the 1120-S and quarterly payroll filings. The math works — but only if the structure is maintained correctly every year.
Run Your Exact Numbers
Our free calculator handles all of this automatically — SE tax, federal brackets, state tax, S-Corp savings estimate, and a side-by-side comparison. Takes 30 seconds.
Run the Free CalculatorAll figures reflect 2026 IRS law. SS wage base: $184,500. SE tax: 15.3% (12.4% SS + 2.9% Medicare). Form 2553 deadline: 75 days from tax year start or March 15 retroactive. Always consult a licensed CPA experienced with S-Corps before electing.