The S-Corporation election is the most talked-about tax move among freelancers, and for good reason: it can permanently eliminate self-employment tax on a portion of your profit. But it is not free, and for many small businesses it saves nothing or even costs more. The key is to understand exactly where the savings come from and to run a real break-even comparison — which is what this calculator does.
The Core Mechanic: Salary vs. Distributions
As a sole proprietor, 100% of your net profit is subject to the 15.3% self-employment tax (12.4% Social Security up to the wage base, plus 2.9% Medicare). When you elect S-Corp status, you become an employee of your own company. You must pay yourself a reasonable salary, and that salary is subject to payroll taxes (the exact same 15.3%, split between "employer" and "employee" portions, plus federal and state unemployment tax). The crucial difference: any remaining profit you take as a distribution is not subject to SE or payroll tax. That is the entire source of the savings.
Worked Example — Net profit $100,000, reasonable salary $60,000
Sole proprietor: SE tax on full $100,000 = 15.3% × $100,000 = $15,300.
S-Corp: Payroll tax on $60,000 salary = 15.3% × $60,000 = $9,180. The remaining $40,000 is a distribution with $0 SE/payroll tax.
Gross SE-tax saved: $15,300 − $9,180 = $6,120.
Subtract admin costs of roughly $2,000 (payroll service, 1120-S prep, state fees) and the net first-year saving is about $4,120. The income tax on the $100,000 is identical under both structures — only the payroll/SE tax differs.
Why "Reasonable Salary" Is the Whole Ballgame
The IRS requires S-Corp shareholder-employees who do work for the business to take a salary that is "reasonable" for the services they perform. There is no fixed percentage in the statute, but practitioners commonly aim for roughly 50%–70% of net profit, adjusted for your role, experience, and what comparable businesses pay. The lower your salary, the larger the distribution and the larger the SE-tax saving — but set it too low and the IRS can reclassify distributions as wages, hitting you with back payroll taxes, penalties, and interest. Document your reasoning (a salary benchmark study or comparable job postings) so you can defend it.
The S-Corp Compliance Burden
An S-Corp is a real corporation and must be run like one. Expect to:
- Run payroll — at least quarterly, with withheld income and payroll taxes deposited on a schedule, and file Form 941 quarterly and Form 940 (federal unemployment) annually.
- Issue yourself a W-2 and file it with the 1120-S.
- File Form 1120-S (the S-Corp return) by March 15, plus Schedule K-1 to yourself.
- Keep a separate business bank account and proper books; the "corporate veil" protects you only if you respect it.
- Pay state fees — an annual report and possibly a franchise or excise tax.
All of this typically costs $1,000–$3,000 per year in software, payroll service, and accounting. The break-even point is usually around $50,000–$60,000 of net profit: below that, the admin cost eats the savings; above it, the S-Corp usually wins.
How to Elect S-Corp Status
You first form an LLC or corporation at the state level, then file Form 2553 with the IRS to choose S-Corporation taxation. To be effective for the current year, Form 2553 generally must be filed within 2 months and 15 days of the start of the tax year (for a calendar-year entity, by March 15), or within 75 days of the entity's formation. Late elections can sometimes be relief-approved, but do not count on it. You can also make the election mid-year only in limited circumstances. Plan ahead with a CPA.
The QBI Deduction Interaction
The 20% Qualified Business Income (QBI) deduction (Section 199A) is available to both sole props and S-Corps, but the math differs: for a sole prop it is 20% of net profit, while for an S-Corp it is 20% of the combined salary plus profit (since both flow through as qualified business income, though the salary is also W-2). For specified service trades or businesses (SSTBs — consultants, lawyers, doctors, many freelancers), the QBI deduction phases out once taxable income passes about $191,950 (single) or $383,900 (joint) for 2025. Because an S-Corp does not change your taxable income much, it will not rescue a lost QBI deduction — but it can slightly reshape it. Don't assume S-Corp fixes QBI phase-out.
Health Insurance Nuance
A sole proprietor deducts health insurance premiums as an above-the-line adjustment on Form 1040 (Schedule 1). An S-Corp shareholder-employee must generally have premiums paid (or reimbursed) by the corporation and reported as W-2 wages to get the same above-the-line deduction — but those premium dollars are then not subject to income tax. Done correctly, the S-Corp route is at least as good, and the premiums can be run through the payroll with no extra payroll tax. This is a detail where the S-Corp can be marginally better, but it requires correct payroll setup.
State-Level S-Corp Costs
Federal tax is only half the story. Some states do not recognize S-Corp status and tax it as a C-Corp, and several impose entity-level taxes: California charges at least an $800 minimum franchise tax (plus a 1.5% net income fee above $1,000), Texas has a margin (franchise) tax, Washington has a business & occupation tax, and New York and New Jersey have their own quirks. In a few states (e.g., Tennessee historically, and some with high entity taxes) an S-Corp can cost more than a sole prop. Use our State SE Tax calculator and a local CPA before electing.
Common Mistakes
- Electing too early. A brand-new business with $20,000 of profit pays more in admin fees than it saves — wait until profit justifies it.
- Setting an unrealistically low salary. This is the #1 audit trigger and can produce back taxes plus penalties.
- Forgetting payroll deposits. Missing federal deposit deadlines brings steep failure-to-deposit penalties, which can dwarf any tax saved.
- Assuming it kills the 0.9% surtax. The Additional Medicare Tax still hits your salary above the threshold; distributions escape it, but only the portion above a reasonable salary.
- Ignoring the corporate veil. Commingling personal and business funds can let creditors (or the IRS) ignore the S-Corp, exposing personal assets.
- Overlooking FUTA/SUTA. An S-Corp adds federal (0.6% up to $7,000) and state unemployment taxes that a sole prop never pays, slightly offsetting the SE-tax saving.
How This Connects to Your Other Taxes
The S-Corp decision changes the inputs to almost every other calculator on this site. Your salary (not total profit) feeds the Self-Employment Tax calculator and the Medicare Surtax calculator; distributions are sprinkled into the Retirement Deduction calculator only through the salary base (you contribute 25% of salary, not distributions); and the lower payroll tax reduces what you must send via quarterly estimated payments. Gig workers on Uber or Upwork who have grown past ~$60,000 of net profit are often the best S-Corp candidates, but should model it here before forming the entity.