S-Corp Tax CalculatorFind out if you're paying too much self-employment tax.

Why the system overcharges sole proprietors

Let's lay it out on the table, man. The tax code has a quiet little trapdoor the system counts on you not finding. It's called the S-corp election, and the folks who know about it save thousands of dollars a year. The folks who don't know about it keep paying an extra 15.3 percent on every dollar of profit, all the way up to the Social Security wage base.

This is the S-Corp Tax Turd. The glob of red tape that makes the smartest tax move feel too complicated to bother with. The 2553 form, the payroll provider, the "reasonable salary" rule, the extra tax return. Each piece is a speed bump. Stack them all and most self-employed people just shrug and keep overpaying.

Don't shrug. Run the numbers. If your net profit is pushing past $60,000 a year, the S-corp election probably pays for itself inside three months. Above $100,000, it's typically a five-figure annual swing. Above $200,000, you're leaving serious money on the table if you haven't made the switch yet.

The catch is the S-corp only works if you run it right. File the form on time, pay yourself a reasonable salary, run actual payroll, keep the books separate. Skip any of those and you're not running an S-corp. You're running an audit risk.

What an S-corp election actually does

An S-corp is not a type of company. An S-corp is a tax election. Most small-business S-corps are actually LLCs at the state level that filed a piece of paper with the IRS (Form 2553) asking to be taxed differently. The legal shell stays an LLC. The tax treatment changes.

Here is what changes. As a sole proprietor or a single-member LLC with no election, every dollar of net profit flows onto your personal tax return and gets hit with self-employment tax. That's 15.3 percent (12.4 percent Social Security plus 2.9 percent Medicare) on the first $184,500 of net earnings in 2026, then 2.9 percent Medicare on everything above that. On top of self-employment tax, you still owe regular federal and state income tax on the full profit.

With an S-corp election, the IRS splits your income into two buckets. Bucket one is your W-2 salary. You pay yourself like an employee, run actual payroll, and payroll tax (15.3 percent combined employer and employee) gets withheld from that salary. Bucket two is distributions. Distributions are profit left over after your salary. Distributions are not subject to self-employment tax or payroll tax. They still get hit with income tax. They just skip the 15.3 percent piece.

That's the whole game. You shift some of your income from "every dollar pays payroll tax" to "only the salary pays payroll tax." The higher your profit, the bigger the distribution bucket, the more the election is designed to save.

Why it works

The IRS gave corporations a break on the double-taxation of corporate profits by creating the S-corp pass-through structure back in 1958. Distributions skipped the payroll tax because, in the original design, C-corp shareholders weren't running the business, they were just investors. When small-business owners started using S-corps, Congress didn't close the loophole. They just added the "reasonable salary" rule to keep owners from paying themselves $0 in salary and calling everything a distribution.

Why it doesn't always work

Running an S-corp has a yearly cost. You need a payroll provider (typically $40 to $80 a month). You need a second tax return, Form 1120-S, which runs $500 to $1,500 depending on your CPA. You may need a bookkeeper. Add it up and most solo S-corps spend $1,500 to $3,500 a year on admin. If your payroll-tax savings on distributions is less than that, the election costs you money. The calculator above tells you exactly where your break-even is.

How to actually run an S-corp

Most S-corps don't get audited. The ones that do, it's usually because the owner skipped one of these steps.

1. Form an LLC first. S-corp is a tax election. You need an entity to elect it on. Most people form an LLC at the state level. Some form a C-corp and elect S-corp, but LLC-plus-S-corp is the standard setup for solo operators.
2. File Form 2553 on time. The election has to be filed within 2 months and 15 days of the start of the tax year you want it to apply. So if you want 2026 S-corp treatment, Form 2553 had to be filed by March 15, 2026. Late elections can sometimes be accepted with reasonable-cause relief, but don't plan on it.
3. Set a reasonable salary. The IRS requires S-corp owner-employees to pay themselves a reasonable wage for the work they do. "Reasonable" means what someone else would earn doing the same job. Too low is the number-one audit trigger. Too high wastes the whole point of the election. Most planners land between 50 and 70 percent of profit, but the honest answer is "what would your role earn at a regular company."
4. Run actual payroll. Not transfers to yourself. Not a lump sum in December. Actual W-2 payroll, withholding federal and state income tax, withholding FICA, paying the employer half of FICA, issuing yourself a W-2 at year-end. A payroll provider (Gusto, QuickBooks Payroll, others) handles the mechanics.
5. Keep separate books. The S-corp has its own bank account, its own credit card, its own bookkeeping. You don't pay personal expenses out of the S-corp. You don't pay S-corp expenses out of your personal account. Commingling is an audit trigger and can wipe out your liability protection.
6. File Form 1120-S every year. The S-corp files its own tax return. It generates a K-1 for you, which flows to your personal 1040. This is the "extra return" in the admin cost.

S-corp vs LLC: they're not the same thing

This confuses almost everyone, so let's be precise. An LLC is a legal entity type. You form one at the state level. It gives you limited liability protection. An S-corp is a tax election. You file a form with the IRS. It changes how the entity is taxed. Most small-business S-corps are LLCs that elected to be taxed as S-corps. The LLC is the shell. The S-corp is the tax flavor.

The decision is layered. First, you pick the entity (LLC for most solo operators). Then, once profit clears the break-even, you file the S-corp election on top of it. You don't swap one for the other. You stack them.

When an S-corp costs MORE than it saves

The S-corp election is not magic. It's an arbitrage between payroll tax (15.3 percent of your salary) and the fixed yearly cost of running it (payroll provider, 1120-S return, bookkeeping). If your profit is too low, the fixed cost eats the arbitrage.

Rough math for a solo operator in a 24 percent federal bracket with a $2,500 admin cost. At $40,000 net profit, a 60 percent reasonable salary ($24,000) leaves $16,000 in distributions. You save roughly 15.3 percent of $16,000 in payroll tax, or about $2,448. Minus the $2,500 admin cost, you're down $52. The election loses money.

Same math at $80,000 profit. Salary $48,000, distributions $32,000, payroll-tax savings ~$4,896. Minus $2,500 admin, net savings ~$2,396. Now it pays.

Same math at $150,000 profit. Salary $90,000, distributions $60,000, payroll-tax savings ~$9,180. Minus $2,500 admin, net savings ~$6,680. Now it's a real win.

Three things shift the break-even:

• Higher admin cost pushes break-even up. If your CPA charges $4,000 for the 1120-S and your payroll provider costs $1,200 a year, you need more distributions to cover it.
• Higher reasonable salary pushes break-even up. If your industry demands a $90,000 salary for your role, and your profit is $100,000, you only have $10,000 in distributions to save payroll tax on.
• Higher state tax rates don't change the S-corp arbitrage much, because both sole prop and S-corp income flow through to your state return. State rates affect total tax, not the difference.

The 3 rules that kill S-corp elections

The IRS doesn't audit most S-corps. When they do, it's almost always one of these three:

1. Unreasonably low salary

Paying yourself $20,000 as an S-corp owner when you net $200,000 is the #1 audit trigger. The IRS looks at what your role earns in the open market, your experience, your time in the business, your duties. If your salary is clearly below market for the work, they reclassify distributions as wages and hit you with the payroll tax you dodged, plus interest and penalties. 8th Circuit cases like Watson v. United States (2011) made this explicit. A $24,000 salary for a CPA netting $203,000 got reclassified.

2. Not running actual payroll

S-corp owner-employees have to be actual W-2 employees. That means payroll runs (monthly, bi-weekly, whatever), withholding gets calculated, the employer side of FICA gets paid, and a W-2 gets issued at year-end. "Paying yourself" via owner draws doesn't count. If you never run payroll, the IRS treats the whole thing as if you were still a sole proprietor and the election never happened.

3. Commingling personal and business

Paying personal expenses from the S-corp account, or running business expenses through your personal card, does two bad things at once. It invites the IRS to argue the S-corp isn't a real, separate entity (which can undo the election). And it pokes holes in the LLC's liability shield, which means a lawsuit can reach your personal assets. Get a separate bank account, a separate card, and keep them separate.

FAQ: s-corp tax calculator

What is an S-corp tax calculator?

An S-corp tax calculator compares what you pay as a sole proprietor or single-member LLC against what you would pay if you elected S-corp status. It models self-employment tax, payroll tax on a reasonable salary, federal and state income tax on salary and distributions, and the ongoing S-corp administrative cost.

At what income does an S-corp start saving money?

The break-even point is typically around $40,000 to $60,000 of net profit, though it varies with state tax rate, reasonable salary, and admin cost. Below that, the yearly cost of running an S-corp (payroll, extra return, bookkeeping) tends to exceed the payroll-tax savings on distributions. The calculator above shows your specific break-even.

What is a reasonable salary for an S-corp owner?

The IRS requires S-corp owner-employees to pay themselves a reasonable salary for their work, based on industry, experience, duties, and comparable wages. Common planning heuristics land between 50 and 70 percent of net profit, but the only legally safe answer is what a similar role would earn in the open market. Setting the salary too low is the number one trigger for an S-corp audit.

Is an S-corp the same as an LLC?

No. An LLC is a legal entity type. S-corp is a tax election filed with the IRS. Most small-business S-corps start as LLCs at the state level, then file Form 2553 to be taxed as an S-corp. You can also elect S-corp status for a traditional corporation. The asset protection comes from the LLC, the tax treatment comes from the election.

Is this S-corp calculator tax advice?

No. This is a calculator. The default values are directional, not prescriptive. Tax outcomes depend on your specific situation, filing status, state, deductions, and industry. Consult a licensed CPA or tax professional before filing a Form 2553 or changing how you pay yourself.