LLC or S-corp: the tax choice that pays off

You formed an LLC, filed the paperwork, and figured the tax question was handled. It wasn't. The LLC decided how you are protected if the business is sued; it decided almost nothing about how your profit is taxed. The choice that quietly moves thousands of dollars a year is a separate one — whether to elect S-corp treatment — and most founders make it late, or never, because no one told them it was a choice at all.

People talk about an "LLC versus an S-corp" as if they were two doors you pick between. They are not the same kind of thing, and seeing why is the whole decision.

An LLC is a legal shell; an S-corp is a tax setting

An LLC, or limited liability company, is a legal entity you create under state law. Its job is to wall your personal assets — your house, your savings — off from the debts of the business. That is a legal question, not a tax one.

An S-corp is not an entity at all. It is a tax election: a form you file with the IRS that changes how an existing entity is taxed. An LLC (or a corporation) elects to be taxed as an S-corp by filing Form 2553. So the real question is never LLC or S-corp. It is whether your LLC keeps its default tax treatment or puts on the S-corp tax setting on top of it. By default, a single-member LLC is taxed as a sole proprietorship and a multi-member LLC as a partnership. In both, the profit flows straight through to your personal return, and that is where the tax bill begins.

The default: every dollar of profit meets the 15.3% tax

As a default LLC, all of your net profit is hit with self-employment tax before regular income tax even enters the picture. Self-employment tax is 15.3% — 12.4% for Social Security (on profit up to the annual wage cap, roughly $176,000) plus 2.9% for Medicare, which has no cap. It is the two halves of Social Security and Medicare tax that a regular employee splits with their employer; working for yourself, you are both, so you pay both halves on essentially all your profit.

That is the leak the S-corp election is built to slow — not to erase payroll tax, but to stop charging the 15.3% on every last dollar the business earns.

The election: a salary plus distributions

When you elect S-corp treatment, you become an employee of your own company. You pay yourself a reasonable salary through actual payroll, and payroll tax — the same 15.3% in substance — applies to that salary and nothing else. The profit left over after your salary is taken as a distribution, and distributions are not subject to self-employment or payroll tax. That gap is the entire strategy: the profit above your salary escapes the 15.3%.

You still owe ordinary income tax on all of it, salary and distribution alike. The election does not touch your income tax; it lowers only the employment-tax piece, by shrinking the base that piece is charged on.

A worked example

Take a solo consultant whose business nets $150,000 in profit for the year. As a default LLC, that whole amount carries self-employment tax: 15.3% on 92.35% of the profit works out to about $21,200. Now run the same business as an S-corp, paying a reasonable salary of $85,000.

• Net profit: $150,000
• Reasonable salary run through payroll: $85,000
• Payroll tax on that salary (15.3%): $13,005
• Profit taken as distributions: $65,000
• Self-employment or payroll tax on the distributions: $0

The employment tax drops from about $21,200 to $13,005 — a gross saving near $8,200, because $65,000 of profit moved out from under the 15.3%. From that you subtract the cost of actually running the S-corp: a payroll service, a separate business tax return, and tighter bookkeeping, which together tend to run $2,000 to $3,000 a year. Net, this founder keeps roughly $5,500 to $6,000 more than the default LLC would have left them — every year, for the same work.

This is also why the election is not worth it when profits are small: below about $40,000 to $50,000, the saving is thin and the added costs eat most of it. The math turns clearly favorable once profit sits well into the tens of thousands above a reasonable salary — for many businesses, somewhere north of $40,000 to $80,000 of profit is where it starts to pay.

The costs, the rule that bites, and when to file

The S-corp saving is real, but it is not free, and its biggest risk is the temptation it creates. Because a lower salary means a larger tax-free distribution, some owners pay themselves a token $20,000 and call the other $130,000 a distribution. That is exactly the pattern the IRS looks for. If your salary is judged unreasonably low, the IRS can reclassify distributions as wages and bill you for the back payroll taxes, plus interest and penalties. The standard is plain: pay yourself what you would have to pay someone else to do your job.

Alongside that rule come real obligations, and you should weigh them before filing:

• Payroll: you must run genuine payroll on your salary, with tax withholding, quarterly filings, and a year-end W-2.
• A separate return: the S-corp files its own tax return (Form 1120-S) in addition to your personal return.
• Reasonable compensation: the salary has to reflect the real value of the work, and you should be able to defend it.
• State treatment: some states levy franchise taxes or fees on S-corps and do not honor the federal savings.
• Cleaner books: salary, distributions, and your ownership basis all have to be tracked accurately.

Timing matters too. The election generally has to be filed within about two and a half months of the start of the tax year it covers, though the IRS grants relief for reasonable late filings. None of this is a reason to avoid the election. It is a reason to run the numbers for your own profit, salary, and state, and to confirm them with a CPA before you file. The savings are dependable when the profit is there; the penalties are just as dependable when the salary is not.