What Is an S-Corp? The Tax Election Every Business Owner Should Understand.
An S-Corp isn't a business type — it's an IRS tax election that can save you thousands in self-employment tax every year.
A guide by Taxstra Tax & Accounting — CPA-led tax strategy for business owners
An S-Corp Is NOT a Business Entity
This is the most misunderstood concept in small business taxation.
An S-Corp is a tax election — not a legal entity. You don't form an "S-Corp" at the state level. You form an LLC (or corporation), and then elect S-Corp tax treatment with the IRS.
What People Think
"I need to form an S-Corp at the state level."
"My LLC and S-Corp are two different things."
"I need to dissolve my LLC to become an S-Corp."
What Actually Happens
You form an LLC with your state — that's your legal entity.
You file Form 2553 with the IRS — that's your tax election.
Your LLC stays the same legally. Only the way it's taxed changes.
How S-Corp Taxation Works
Income flows through to your personal return on a K-1 — but the magic is in how that income is classified.
Salary (W-2)
You pay yourself a "reasonable salary." This portion is subject to Social Security andMedicare taxes (15.3% combined, split between employer/employee).
Distributions (K-1)
Profit above your salary is taken as distributions. These are subject to income tax but NOT self-employment tax. This is where the savings happen.
The Savings
As a sole proprietor, you pay 15.3% SE tax on all profit. As an S-Corp, you only pay it on your salary. The rest flows through free of self-employment tax.
Who Qualifies for S-Corp Election?
The IRS has specific requirements to qualify for Subchapter S status.
US Citizen or Resident Alien
All shareholders must be U.S. citizens or resident aliens. Non-resident aliens cannot be shareholders of an S-Corp.
Maximum 100 Shareholders
S-Corps are limited to 100 shareholders. Family members can elect to be treated as a single shareholder.
One Class of Stock
S-Corps can only have one class of stock. Voting and non-voting shares are allowed, but economic rights must be identical.
No Corporate or Partnership Shareholders
Shareholders must be individuals, certain trusts, or estates. Other corporations, partnerships, and LLCs cannot own S-Corp stock.
The Math: Sole Prop vs. S-Corp
See exactly how much you could save in self-employment tax at different profit levels.
| Net Profit | SE Tax (Sole Prop) | S-Corp Salary | S-Corp SE Tax | Annual Savings |
|---|---|---|---|---|
| $100,000 | $14,130 | $50,000 | $7,065 | $7,065 |
| $200,000 | $23,730 | $80,000 | $11,304 | $12,426 |
| $500,000 | $30,594 | $120,000 | $16,956 | $13,638 |
* Figures are simplified estimates for illustration. Actual savings depend on your specific situation, state taxes, and reasonable compensation analysis.
What Changes When You Elect S-Corp
The tax savings are real — but there are new responsibilities. Here's what to expect.
Payroll Requirement
You must run payroll for yourself and any owner-employees. This means W-2s, payroll tax deposits, and quarterly 941 filings. Expect $30–$80/month for payroll processing.
Form 1120-S Filing
Your S-Corp files its own tax return (Form 1120-S) — separate from your personal return. This is due March 15th each year, and late filing penalties are $220/month per shareholder.
K-1 Issuance
The S-Corp issues a Schedule K-1 to each shareholder, reporting their share of income, deductions, and credits. This flows to your personal 1040.
Quarterly Payroll Taxes
As an employer, you'll deposit payroll taxes (federal income tax withholding, Social Security, Medicare) either semi-weekly or monthly, plus file quarterly Form 941.
S-Corp bookkeeping is more complex than sole proprietor bookkeeping.
Reasonable compensation, shareholder distributions, and basis tracking require a CPA who understands the rules. See Bookkeeping for S-Corps for what the IRS actually expects.
Keep Learning
Dive deeper into S-Corp strategy with these resources.
LLC vs S-Corp
Side-by-side comparison to find the right structure.
Learn More →S-Corp Optimization
Advanced strategies to maximize your S-Corp savings.
Learn More →S-Corp Calculator
See your estimated tax savings in 60 seconds.
Learn More →Monthly Accounting
Let us handle your books, payroll, and S-Corp compliance.
Learn More →S-Corp FAQ
Your questions about S-Corp election and taxation, answered.
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