When someone starts a business, the first call is usually to a lawyer or an accountant to set up an LLC. That's a reasonable first step. The LLC is cheap to form, easy to maintain, and provides personal liability protection. It checks the boxes. The problem is what happens next: nothing. The entity gets filed, the operating agreement goes in a drawer, and the business grows, sometimes significantly, inside a structure that was never designed for where it ended up.
I've worked with business owners who built profitable companies generating seven figures a year, still operating as a single-member LLC taxed as a sole proprietor, paying self-employment tax on every dollar of net income. No one ever told them there was a better option. Or if someone did mention an S-corp, it wasn't explained clearly enough to act on.
Entity structure isn't glamorous. But it has a real dollar impact. And for business owners at certain income levels, getting it wrong is an expensive mistake that compounds quietly every year.
The LLC isn't the strategy; it's the container
This is the most common point of confusion. An LLC is a legal entity, not a tax election. By default, the IRS doesn't care that you have an LLC. A single-member LLC is disregarded; it doesn't even file its own return. The income flows directly to Schedule C of your personal return, and you pay self-employment tax (15.3% on the first $168,600 in 2024, 2.9% beyond that) on all of it. If your business earns $300,000 in net income, you're paying full self-employment tax on the whole amount before federal and state income taxes apply on top of that.
The entity structure question is really about how you want the IRS to treat the business. And that's a separate decision from what legal form the business takes.
When an S-corp election actually helps
An LLC can elect to be taxed as an S-corporation. Most people who've heard of this concept know that it involves a "reasonable salary" for the owner and distributions beyond that. What they often don't fully understand is why that matters.
Here's the core mechanic: self-employment taxes apply to wages and self-employment income, not to S-corp distributions. So if you elect S-corp status and pay yourself a reasonable salary, say, $120,000 on $300,000 of business income, you're only paying self-employment-equivalent taxes (payroll taxes, in this case) on the $120,000, not on the full $300,000. The remaining $180,000 flows out as a distribution and isn't subject to those taxes.
The S-corp election isn't a loophole. It's a legitimate planning tool, and the IRS has known about it for decades. The question is whether your income level makes the math work after you account for the added complexity.
The savings can be meaningful. On $180,000 of income that shifts from being subject to self-employment tax to not, you're looking at potential savings in the range of $10,000–$15,000 per year depending on your specific situation. That's real money. But it comes with costs: payroll processing, additional accounting complexity, a separate corporate return (Form 1120-S), and higher accounting fees. The math only works when the savings exceed the overhead.
As a general rule of thumb, the S-corp election starts making sense when net business income is consistently above $60,000–$80,000, and it becomes clearly worth it somewhere in the $100,000–$150,000+ range. Below that, the administrative costs often eat the savings. Above it, the math is usually compelling.
The question most CPAs don't ask
Beyond the SE tax question, entity structure affects several other things that often get overlooked: retirement plan contribution limits, the ability to bring on investors or co-owners, how the business gets valued at sale, and how your personal wealth plan interacts with business cash flows.
A business owner running a highly profitable S-corp has access to retirement contribution strategies, including solo 401(k) and defined benefit plans, that can shelter significant income from tax entirely. The combination of the right entity structure and the right retirement strategy can have a larger combined impact than either one alone.
This is where having a CPA who understands the whole picture becomes important. The entity question isn't just about this year's tax bill. It's about the ownership structure, the exit strategy, how the business fits into your broader wealth plan, and what you're building toward. Those decisions compound over time in both directions; structured well, they multiply. Structured poorly, the inefficiency adds up quietly, year after year, until someone finally does the math.
If you haven't reviewed your entity structure since the business was formed, or since income grew past a certain threshold, it's worth the conversation. The answers aren't always what people expect, and sometimes the right move is to leave things exactly as they are. But you should at least know why.
