LLC vs S-Corp: A US Contractor Breakdown

At some point every growing contractor hears the same advice from a buddy at the supply house: “You should be an S-Corp, man, you’re paying way too much tax.” Sometimes that is true. Often it is not. The LLC vs S-Corp decision is one of the most misunderstood choices in the trades, partly because the terms describe two different things that people treat as one.

Here is the stake, up front. Choose the wrong structure and you either overpay in self-employment tax year after year, or you take on payroll costs and paperwork your income cannot yet justify. Getting the LLC vs S-Corp call right at the correct income level can put thousands of dollars back in your pocket — and getting it wrong quietly drains them.

Sole proprietor, LLC, and S-Corp: what each one is

First, clear up the vocabulary, because it trips almost everyone. A sole proprietorship is the default — if you started working and never filed anything, that is you. An LLC is a legal structure formed with your state; it separates your personal assets from business liability. An S-Corp is not a legal entity at all; it is a tax election an LLC (or corporation) makes with the IRS. In other words, the LLC vs S-Corp question is not really either/or — it is whether your LLC should be taxed as one.

Feature	Sole proprietor	LLC	LLC taxed as S-Corp
Liability protection	None	Yes	Yes
Self-employment tax	On all profit	On all profit	Only on your salary
Setup and upkeep	Minimal	State filing + fee	Payroll + separate return
Best suited to	Side income, testing	Most established solos	Consistent higher profit

Notice that liability protection comes from the LLC, not the tax election. Consequently, most contractors form an LLC first for the legal shield, then decide later whether the S-Corp election is worth it.

LLC vs S-Corp: where the tax difference actually lives

The entire LLC vs S-Corp financial argument comes down to self-employment tax. As a sole proprietor or standard LLC, you pay 15.3% SE tax on all of your net profit. An S-Corp changes the math: you become an employee of your own company, pay yourself a “reasonable salary” that carries payroll tax, and take the rest as distributions that are not subject to that 15.3%.

Consider an operator netting $100,000. As a standard LLC, SE tax applies to essentially the whole amount. As an S-Corp paying a reasonable salary of, say, $60,000, only that salary carries payroll tax; the remaining $40,000 in distributions avoids the 15.3%. That gap can be worth several thousand dollars a year. However, the word “reasonable” is load-bearing — pay yourself an artificially low salary to dodge payroll tax and the IRS can reclassify it, with penalties attached.

There is a cost on the other side of the ledger, too. An S-Corp means running real payroll, filing a separate business return, and usually paying an accountant to keep it clean. Those costs commonly run $1,500 to $3,000 a year. Therefore the LLC vs S-Corp election only pays off once your SE-tax savings clearly exceed that overhead.

LLC vs S-Corp: which one fits your business now

Rules of thumb are not gospel, but they help. Most advisors start seriously weighing the S-Corp election once net profit is consistent and somewhere north of $40,000 to $80,000 a year — the range where SE-tax savings outrun the added payroll and filing costs. Below that, the standard LLC usually wins on simplicity. Run through this quick check before you decide:

• Is your profit consistent? One good year is not a reason to restructure.
• Is net profit above roughly $50,000? That is where the S-Corp math starts to work.
• Can you run payroll reliably? The election requires it, every pay period.
• Do you have an accountant? The S-Corp return is not a DIY project.
• Do you want the admin? More tax savings means more paperwork.

Whichever structure you land on, the business itself still has to be organized underneath it. An S-Corp election assumes you can cleanly separate salary from distributions and show what the company actually earned. Tools like SendWork will not file your election, but keeping invoices, payments, and job records in one place is what makes that salary-versus-distribution split defensible instead of a guess at year-end.

The honest read: the LLC vs S-Corp choice is a math problem disguised as an identity upgrade. Do not elect an S-Corp because it sounds more official. Elect it when the numbers say it saves you more than it costs — and revisit the decision every year as your profit moves.

Timing matters as much as the choice itself. For an S-Corp election to apply to a given tax year, the paperwork generally has to be filed within roughly the first two and a half months of that year, although the IRS grants late-election relief in many cases. Because of that window, the smart move is to model the numbers with an accountant in the fall — not the following spring, when it is already too late to act on the year that just ended. Treat the LLC vs S-Corp question as an annual review rather than a one-time decision, and you will catch the exact moment the election starts paying off.

The IRS explains each option on its business structures page, and an hour with an accountant will usually pay for itself here. Structure only matters if the business under it is actually profitable — see our guide on why busy and profitable are not the same thing. Whichever entity you choose, you will still owe quarterly estimated taxes on the profit. Once the structure is set, the next lever is sheltering some of that profit — compare the contractor retirement plans that fit a sole prop, LLC, or S-Corp. For more US admin and tax guides, visit the Business Admin & Taxes: USA archive.