Should your business be an S corporation?
What the S corporation election saves, what it costs to run, how a reasonable salary limits the benefit, and when staying a sole proprietor is better.
Quick answers
- Should my business be an S corporation?
- Generally only when profit sits comfortably above what a reasonable salary for your work would be, because only the profit above that salary escapes payroll tax. The saving has to clear the annual cost of payroll and a second return first.
- What is a reasonable salary for an S corporation owner?
- What someone else would be paid for the same job, judged on the work you actually do. A salary set low to shrink payroll tax is the most examined feature of a small S corporation, and a correction brings back employment taxes, interest and penalties.
- What does an S corporation cost to run?
- A payroll system with scheduled deposits and employment tax returns, a separate Form 1120-S with its own earlier deadline and preparation fee, state registrations and annual reports, and documentation supporting the salary you set.
An S corporation election can cut the payroll-tax bill on business profit, because only the salary you pay yourself carries that tax and the rest of the profit does not. It also adds a payroll system, a second tax return and a judgment call about salary that the IRS is entitled to disagree with.
| Combined self-employment tax rate | 15.3% | IRC §1401, not indexed |
|---|---|---|
| Share of net profit subject to self-employment tax | 92.35% | Schedule SE line 4a, not indexed |
| Social Security wage base | $184,500 | SSA 2026 cost-of-living adjustment fact sheet |
What a sole proprietor pays now
Profit from a business you own alone lands on Schedule C and then on Schedule SE. Self-employment tax runs at 15.3% on 92.35% of that profit — all of it, not a slice you choose. The Social Security portion stops once wages and self-employment earnings together reach $184,500; the Medicare portion has no ceiling.
Income tax sits on top of that at your bracket. Half the self-employment tax comes back as a deduction, which softens the income-tax side but not the payroll-tax side.
What the election changes
An S corporation is not a different kind of business, it is a different way of being taxed. The company files its own return, Form 1120-S, and issues you a Schedule K-1; the profit is still taxed to you personally rather than at a corporate rate.
The difference is how that profit is split. You become an employee of your own company and pay yourself a salary through payroll, which carries Social Security and Medicare tax the same as any job — half withheld from you, half paid by the company. Whatever profit is left after the salary is distributed to you as a shareholder, and that portion carries no Social Security or Medicare tax at all.
The saving is the payroll tax on the distributed share. Income tax still applies to the whole profit either way; the one other moving part is the qualified business income deduction, which the split affects and which is covered below.
What it costs to run
The saving is real, and so is the overhead.
- Payroll. Salary means withholding, deposits on a schedule, the employment tax returns that go with it, generally quarterly Forms 941 and an annual Form 940, and a W-2 in January. Almost everyone pays a service to do it.
- A second return. Form 1120-S is due earlier in the year than your personal return, and it is a separate preparation fee.
- State-level obligations. Registration, annual reports and state filings vary by where the business operates, and the corporate form usually carries more of them than a sole proprietorship does.
- Documentation. A written basis for the salary, an actual separation between company money and personal money, and minutes or resolutions where the state expects them.
The rough break-even
There is no threshold in the law, and any number quoted as one is a rule of thumb rather than a rule. The honest version of the test is this: the election starts to pay when profit sits comfortably above what a reasonable salary for your work would be, because only the profit above the salary escapes payroll tax, and that saving has to clear the annual cost of payroll and a second return before anything reaches you.
A business whose entire profit is roughly what the owner's labor is worth has nothing left to distribute, and the election just buys paperwork. Run the comparison with real numbers from a full year before filing anything.
How the QBI deduction fits
The qualified business income deduction takes 20 percent off qualifying business profit before income tax is figured, and it applies to S corporation profit as well as to Schedule C profit. Salary is not qualified business income, so every dollar moved into salary is a dollar removed from the base the deduction is computed on.
That works against the payroll-tax saving to some extent, and above certain income levels the deduction is limited by reference to W-2 wages the business paid, where salary starts helping instead. Which way it lands depends on your total income and your line of work, and it is the part of this decision most worth modeling before you elect.
Making the election
- Confirm the business qualifies: a domestic entity, one class of stock, no more than one hundred shareholders, and only individuals, estates and certain trusts among them.
- File Form 2553, signed by every shareholder, within the window the instructions set for the year you want it to take effect.
- Set up payroll before the first dollar of salary is paid, not after.
- Have the salary figure documented, and revisit it as the business grows.
Late elections have a relief procedure with its own conditions, so a missed date is not always fatal. Filing on time is still cheaper than qualifying for relief.
When to stay where you are
Stay a sole proprietor when the profit is modest, when it swings hard from year to year, when the work is seasonal enough that a real salary is awkward, or when you would not keep up with payroll deadlines. Revocation is possible but not casual, and a five-year wait can apply before you elect again.