An S-corporation isn’t a type of business you form. It’s a tax election. A corporation or LLC files IRS Form 2553, and from then on its income, losses, deductions and credits pass through to the owners’ personal returns instead of being taxed at the corporate level.
That’s the whole idea. What makes it worth knowing about is the second effect: owners who work in the business can split their pay into salary and distributions, and only the salary carries payroll taxes. For a profitable small business, that can mean real money.
What is an S-corporation, and how does it work?
You start with a regular corporation or an LLC. You file Form 2553. Once the IRS accepts the election, two things change.
No corporate-level tax. The business doesn’t pay federal income tax on its profits. The profit shows up on each owner’s personal return, so you avoid the double taxation a C-corp faces.
Salary plus distributions. If you work in the business, you have to pay yourself a “reasonable salary” through payroll. Profit above that salary can come out as distributions, and distributions aren’t subject to self-employment tax.
Here’s what that looks like with round numbers:
| Item | Amount |
|---|---|
| S-corp profit | $150,000 |
| Your salary (payroll taxes apply) | $70,000 |
| Distribution (no self-employment tax) | $80,000 |
| Potential self-employment tax savings | $12,000+ |
The savings come from that $80,000 escaping the 15.3% Social Security and Medicare tax it would carry if you were taxed as a sole proprietor or default LLC.
How does it compare with C-corp double taxation?
A C-corp pays corporate tax on its profit, then shareholders pay tax again on the dividends. An S-corp skips the first layer. Here’s a simple comparison:
| Step | C-corp | S-corp |
|---|---|---|
| Profit | $100,000 | $100,000 |
| Corporate tax (21%) | $21,000 | – |
| Left for dividends | $79,000 | – |
| Personal tax | $15,800 (20% on dividends) | $24,000 (24% bracket) |
| Total tax | $36,800 | $24,000 |
That’s a $12,800 difference in this example. Treat it as an illustration of the two-layer problem, not a forecast. Your real numbers depend on your bracket, your state and how much you pay yourself.
S-corp owners may also qualify for the 20% Qualified Business Income (QBI) deduction, which lowers the bill further.
Who can elect S-corp status?
The IRS rules are strict, and breaking one can cost you the election.
| Requirement | What it means |
|---|---|
| 100 shareholders or fewer | Family members can be treated as one shareholder |
| U.S. citizens or residents only | No foreign shareholders |
| Eligible shareholders | Individuals, estates and certain trusts. No corporations or partnerships |
| One class of stock | All shares have identical rights to distributions and liquidation proceeds |
| Domestic company | Formed in the United States |
| Eligible business type | Banks, insurance companies and domestic international sales corporations can’t elect |
| Permitted tax year | Calendar year or an allowed fiscal year |
The one-class-of-stock rule is easy to overlook. It means no preferred shares and no special distribution deals for one owner.
How do you set one up?
- Form a corporation (Articles of Incorporation with your state) or an LLC.
- Confirm you meet every eligibility rule above.
- Get an EIN if you don’t already have one.
- File Form 2553 (Election by a Small Business Corporation) with the IRS.
- Set up payroll, because working owners must receive W-2 wages.
Timing on Form 2553 matters. New corporations should file within 75 days of formation. Existing corporations have until March 15 for the election to cover the current tax year. If you miss the window, the IRS may grant late election relief when you had reasonable cause.
Can an LLC be an S-corp?
Yes, and for small businesses it’s often the cleaner route. You keep the LLC and simply elect S-corp tax treatment with Form 2553. There’s no conversion. You get the LLC’s flexibility on the legal side and S-corp taxation on the tax side.
S-corp vs C-corp, LLC and sole proprietorship
| Feature | S-corp | C-corp | LLC | Sole proprietorship |
|---|---|---|---|---|
| Liability protection | Yes | Yes | Yes | No |
| Pass-through taxation | Yes | No | Yes | Yes |
| Self-employment tax savings | Yes | N/A | No | No |
| Ownership restrictions | Yes | No | No | N/A |
| Formalities required | High | High | Medium | Low |
| Ability to raise capital | Limited | High | Limited | Low |
What’s the catch?
There are three, and they’re why the election isn’t right for everyone.
The salary has to be reasonable. The IRS watches S-corp owner pay closely. A reasonable salary is what you’d pay someone else to do your job, judged on industry standards, your experience, the time you put in and local wages. Paying yourself too little so you can take more as distributions is exactly the pattern that draws audits and penalties.
Ownership is boxed in. The 100-shareholder cap, the ban on foreign shareholders and the single class of stock make it a poor fit if you plan to raise outside capital, bring in foreign investors or go public. An IPO isn’t possible as an S-corp.
There’s more paperwork. You’ll run payroll, file Form 1120-S by March 15, and issue a Schedule K-1 to every shareholder. If your S-corp is a corporation, you’ll also hold annual shareholder and director meetings and keep minutes. Every S-corp files the state’s annual report and keeps business money in its own bank account.
Ongoing costs typically include state filing fees ($50-$800), bookkeeping ($500-$3,000+), payroll processing ($300-$1,500+) and tax preparation ($500-$2,000+). Those numbers vary a lot by state and provider.
When does an S-corp make sense?
Generally, businesses earning $40,000+ in profit start to see meaningful savings. Below that, the payroll and accounting costs can eat most of the benefit.
Our view: if you’re a profitable owner-operator with a few U.S. owners and no plans for venture funding, the S-corp election is worth running the numbers on. If you’re still under that profit level, or you expect foreign investors or multiple share classes, stay as you are for now. You can elect later.
Before you file, have a tax professional calculate your savings with a realistic salary figure. The salary number drives the whole result.
Frequently asked questions
Can an LLC elect S-corp status?
Yes. File Form 2553 and the LLC is taxed as an S-corp while staying an LLC under state law.
Do I need to convert my LLC to a corporation first?
No. You keep the LLC and only change how it’s taxed.
What’s a reasonable salary for an S-corp owner?
Roughly what you’d pay someone else to do your job. The IRS looks at industry standards, your experience, time spent and comparable wages in your area.
What happens if I lose S-corp status?
If you break the requirements, the IRS can end your election. The business is then taxed as a C-corp, which can mean double taxation and back taxes.