What is an S-Corp? The short, founder-friendly version
An S-Corp is a tax election, not an entity. Here is what it actually does, who can elect it, and when an LLC should consider it.
Most founders hear “S-Corp” and assume it's a kind of company you can form at the Secretary of State. It isn't. An S-Corp is a tax status you elect with the IRS after you've already formed an LLC or a corporation. The legal entity stays the same. Only the way it's taxed changes.
It's a tax election, not an entity
When you form a company in any US state, you choose an entity type (an LLC or a corporation). That choice is filed with the state. The federal government then taxes that entity based on its default tax classification or whatever you elect on Form 2553.
An S-Corp election tells the IRS that profits should pass through to the owners' personal returns rather than being taxed at the entity level. Most single-member LLCs already get pass-through treatment by default, so the S-Corp election is mostly interesting once you start paying yourself a meaningful salary. We'll come back to why.
Who can elect it
The IRS has strict eligibility rules. To elect S-Corp status your company must:
- Be a domestic entity (formed in the US).
- Have only allowed shareholders (US citizens or residents, certain trusts, and estates).
- Have no more than 100 shareholders.
- Have only one class of stock.
- Not be an ineligible corporation (some banks, insurance companies, and domestic international sales corporations are excluded).
The big one for international founders: if any owner is a non-resident alien, the S-Corp election is off the table. That alone disqualifies most founders forming a US LLC from outside the country. For more on that scenario, the post on LLC vs C-Corp covers what to do instead.
The reasonable-salary requirement
The main reason US founders elect S-Corp status is to save on self-employment tax. A regular LLC owner pays self-employment tax (15.3%) on the entire net profit. An S-Corp owner pays themselves a salary (subject to payroll taxes) and takes the rest as a distribution (not subject to self-employment tax).
The catch is the IRS expects that salary to be “reasonable” for the work performed. If you net $200,000 and pay yourself a $20,000 salary, that's a red flag and a common audit trigger. Reasonable usually means a market rate for someone doing your role in your industry. You also have to run actual payroll, which means a payroll service, quarterly filings, and a W-2 at year-end. That overhead is the reason the S-Corp election usually only makes sense once your business is netting roughly $80,000 or more.
When an LLC should consider electing S-Corp status
Rough rule of thumb: if you're a US-based LLC owner clearing $80k or more in net profit, the S-Corp election is worth a conversation with an accountant. Below that, the payroll and bookkeeping costs eat the tax savings. Above that, the math usually wins.
Two things to know before you file. First, the election has a deadline (within 2 months and 15 days of the start of the tax year you want it to apply). Miss it and you wait until next year. Second, you can revoke the election, but doing so locks you out for five years. Treat it like a long-term decision, not a quick experiment.
Read next: If you're still deciding what to form in the first place, start with LLC vs C-Corp. If you're forming an LLC and need an EIN to elect S-Corp later, see What is an EIN. Ready to form? Start your LLC with EntityEngine.
Keep reading
Two more posts worth your time if this one was useful.
LLC vs C-Corp: Which entity should you form?
A practical comparison of LLCs and C-Corps for founders: tax treatment, ownership, fundraising, paperwork, costs, and when to convert one to the other.
What is an EIN and why does your LLC need one?
An EIN is your LLC’s federal tax ID. Here’s what it does, why your bank will ask for it, and how to get one with or without a US Social Security number.