LLC, S-corp and self-employment tax — the honest break-even

Somewhere around the second profitable year, every freelancer receives the advice — from a YouTube thumbnail, a golf partner, or an aggressive TikTok — that they’re “throwing away money” by not having an LLC taxed as an S-corp. The advice is sometimes right, frequently premature, and almost always delivered without the costs attached. Here is the version with the costs attached.

First, the LLC myth

A single-member LLC changes nothing about your federal taxes. It is a disregarded entity: same Schedule C, same self-employment tax, same quarterly estimates, same numbers in our calculator. What an LLC actually provides is liability separation (your personal assets vs. business obligations — genuinely valuable in some trades), a business name with paperwork behind it, and, in some states, an annual fee for the privilege. Form one for those reasons whenever you like. Just don’t expect the tax return to notice.

The LLC matters to this guide for one reason: it’s the legal vessel that can elect S-corp taxation — the thing that actually changes numbers.

How the S-corp saving works

As a sole proprietor, your entire profit faces self-employment tax — 15.3% up to the Social Security wage base, 2.9%+ beyond (the full mechanics).

An S-corp splits your profit into two streams. You become your company’s employee, paid a salary that bears normal payroll taxes (the same 15.3%, just split on paper between you and your company). Whatever profit remains flows to you as a distribution — and distributions face no Social Security or Medicare tax at all. The saving is the payroll tax avoided on the distribution slice.

The catch is the hinge of everything: the IRS requires the salary to be reasonable — what comparable work commands in the market. Pay yourself $25,000 while billing $200,000 as a consultant and you’ve made the exact bet the IRS audits S-corps for; reclassification arrives with back payroll taxes and penalties. “Reasonable” is a facts-and-circumstances judgment — industry pay data, your hours, your role — and it’s the number your CPA earns their fee defending.

What it costs — the list the thumbnail omits

• Payroll itself. A salary means real payroll runs: withholding, quarterly Form 941 filings, a W-2 in January, unemployment-insurance registrations. In practice a payroll service, at a monthly subscription, forever.
• A separate business tax return (Form 1120-S) with its own deadline (March 15!), its own extension, and typically a paid preparer.
• State-level friction. Some states charge franchise or entity taxes that eat into the saving; a few treat S-corps unfavorably enough to change the answer entirely. This is a per-state homework item, not a footnote.
• Bookkeeping discipline. Clean separation of business and personal becomes mandatory, not aspirational — running personal spending through the entity undermines both the tax position and the liability shield.
• Retirement-plan interaction. Solo-401(k) employer contributions key off your salary, not total profit — a low salary shrinks your shelter space. The optimization pulls in two directions, which is why it needs an actual advisor, not a rule of thumb.

Total carrying cost for a typical solo operation: a couple of thousand dollars a year in services and returns, plus your own administrative attention — before any state quirks.

The break-even, honestly

The saving is roughly 15.3% of the distribution (less at incomes past the wage base, where the sole-proprietor alternative was only paying Medicare rates anyway). The cost is the couple of thousand above. So the question is: how large a distribution can you defensibly run?

At $60,000 of profit, a reasonable salary for most professional work consumes most of it — the distribution is thin, the saving might not clear the costs, and you’ve bought yourself a second tax return for the privilege. Somewhere in the $80,000–120,000+ sustained-profit range, with a defensible salary meaningfully below profit, the arithmetic starts clearing the costs with room to spare — which is why that’s the range where CPAs start raising it unprompted. Sustained matters: profits that might dip make the fixed costs regressive, and un-electing is paperwork of its own.

One more honest wrinkle: the QBI deduction complicates the pure SE-tax framing — S-corp salary reduces the qualified business income the 20% deduction applies to, clawing back part of the apparent saving for some profiles. It’s exactly the kind of interaction that belongs in a CPA’s projection with your real numbers, not in a listicle’s example.

The decision procedure

1. Under ~$80k sustained profit, or profit still volatile: stay Schedule C. Spend the energy on deductions and retirement contributions — bigger, simpler wins at this stage. An LLC for liability is fine anytime; it changes nothing here.
2. Approaching six figures with stability: pay a CPA for a one-hour projection with your actual numbers — salary comps, your state’s fees, QBI interaction, payroll costs. The fee is trivial against either answer being right.
3. If you elect: do it properly — payroll service from day one, salary documentation in the file, clean books, and estimated taxes recalibrated (your salary now has withholding; the W-2 + 1099 machinery suddenly applies to you).

The S-corp is a real tool with a real saving at the right scale. The people it disappoints are the ones who bought the structure before they had the profits — paying fixed costs for a percentage of a distribution that wasn’t there yet.

General information compiled July 2026, deliberately without state specifics — entity economics vary sharply by state (methodology). This is the one topic on this site where “talk to a CPA” is not a hedge but the actual advice.