The most expensive line on many contractors' tax returns isn't income tax. It's the one labeled self-employment tax: 15.3% on nearly every dollar of profit, before income tax even shows up.
If you're a sole proprietor or a single-member LLC taxed by default, you pay that 15.3% on your profit. All of it. On $200,000 of profit, that's over $30,000 — just for Social Security and Medicare.
The S-corp election exists to change that math. Not eliminate it. Change it. Let's walk through the real numbers so you can see whether it fits your business.
How does the S-corp actually save you money?
Here's the core mechanic, in plain English: as a sole proprietor, you pay 15.3% self-employment tax on your profit. As an S-corp owner, you pay yourself a salary through payroll — and you pay that same 15.3% only on the salary. The remaining profit, taken as distributions, is not subject to self-employment tax.
Same business. Same profit. Different tax system. That's the whole trick.
This isn't a loophole. Congress designed S corporations this way on purpose — so small businesses wouldn't be taxed twice. You're not gaming the system. You're reading the manual.
What do the real numbers look like?
Take two contractors who each clear $280,000 in profit.
Contractor A operates as a sole proprietor. He pays 15.3% self-employment tax on most of that $280,000 — over $40,000, before income tax.
Contractor B elected S-corp status and pays herself a $120,000 reasonable salary through payroll. The 15.3% applies only to the $120,000 salary: about $18,360. The remaining $160,000 flows through as distributions, free of self-employment tax.
The difference: roughly $24,000 a year. Every single year.
One owner I worked with restructured, set a reasonable salary, and ran payroll correctly — and cut her tax bill by $28,000. The math wasn't magic. It was the 15.3%, legally avoided on the portion of profit taken as distributions instead of salary.
What does it cost to run an S-corp?
This is the part the internet gurus skip. An S-corp isn't free:
- Payroll service — you must run payroll, on time, every pay period
- An extra tax return — the S-corp files its own return (Form 1120-S) on top of your personal return
- Tighter bookkeeping — no more commingling personal and business money
All in, figure $3,000–$5,000 a year in added costs. Against $24,000 of annual savings, the election pays for itself five times over.
But — and this matters — below about $60,000–$80,000 of profit, the math often flips. The fixed costs of payroll and the extra return eat up the savings. If you're at $70,000 of profit, don't elect S-corp status because someone on YouTube said to. Price it, don't assume it.
What is a "reasonable salary" — and why does the IRS care?
This is where S-corp owners get in trouble. The IRS requires you to pay yourself a "reasonable" salary for the work you do. Set your salary absurdly low — say $30,000 while taking $250,000 in distributions — and the IRS can reclassify those distributions as wages, then hit you with back payroll taxes plus penalties.
Three things that break an otherwise good S-corp:
- A salary set unreasonably low to dodge payroll tax
- Sloppy payroll filings — late deposits, missing quarterly returns
- Commingled money — paying personal bills from the business account so the "corporation" looks like a hobby
The strategy works when the formalities are respected. If you're an S-corp owner (or considering it), document how your salary was set — comparable pay data, your hours, your duties. That one file is your defense if the IRS ever asks.
Do you need an LLC first?
Not necessarily — and this is one of the most misunderstood points. An LLC is just a container. By default, a single-member LLC is taxed exactly like a sole proprietorship: same 15.3% on all the profit. The LLC gives you liability protection, but it changes your tax bill by zero dollars.
The tax savings come from what the LLC *elects* to be taxed as. Your existing LLC can elect S-corp taxation (Form 2553) without forming a new entity. The election is the strategy; the LLC is just the container it lives in.
So if someone tells you "form an LLC to save on taxes," they have it backwards. Form the LLC for protection. Make the election for taxes. And price each decision separately.
When should you revisit the decision?
The S-corp election that saved you money at $150,000 of profit might be costing you at $300,000 if your salary was never adjusted. Entities are like work boots — the pair that fit when you started the company may be pinching now that you're running.
Run this check every July, mid-year:
- How does actual profit compare to January's estimate?
- Does my entity — and my salary — still fit this profit level?
- Are my estimated payments on track?
If your profit has doubled since you chose your entity and nothing was revisited, it's time for a fresh analysis.
Your move
Find last year's return and locate the self-employment tax line. That number is the maximum prize available from getting your structure right. Then ask your tax pro one question: *"At my profit level, would an S election save me more than it costs to run payroll?"*
If you don't have a tax pro who can answer that with your actual numbers — not a guess — that's a conversation worth having. Book a discovery call here and we'll run your math together.
*This article is for education only and isn't tax advice for your specific situation — talk to a qualified tax professional before changing your entity.*