LLC vs. S Corporation: How the Tax Actually Differs in South Carolina

This is one of the most common questions a small business owner brings to a CPA, and the way it is usually phrased — "should I be an LLC or an S corp?" — hides the answer. They are not alternatives. One is a legal structure you form with the state; the other is a tax status you elect with the IRS. Most South Carolina owners who make this change keep the LLC and elect to have it taxed as an S corporation.

What each one actually is

Where the money actually changes hands

The whole argument comes down to self-employment tax. On a default LLC, your share of the net profit is generally subject to self-employment tax — Social Security and Medicare — on top of income tax. Social Security applies up to an annual wage base that changes every year; Medicare has no ceiling.

Elect S corporation status and the profit splits in two. You pay yourself W-2 wages, which carry payroll tax. What is left can be taken as a distribution, which does not. That gap is the entire benefit.

Which is why the next sentence matters more than the last one.

Reasonable compensation is where this goes wrong

An owner who works in the business must pay themselves reasonable compensation for that work before taking distributions. This is not a formality and it is not a percentage you can look up. It is a facts-and-circumstances test, and it is the single most examined issue on S corporation returns.

The temptation is obvious: the lower the wage, the smaller the payroll tax. The IRS is entirely aware of this. Where compensation is unreasonably low, it can recharacterize distributions as wages and assess the payroll tax, plus penalties and interest. What supports a figure is evidence — what the role would cost to hire, your hours, your duties, industry data, and what the business could afford.

• What would you pay someone else to do your job?
• How many hours do you actually work in the business?
• How much of the profit comes from your labor versus from capital, employees or systems?
• What do comparable roles pay in the Charleston market?

What the election costs you

The saving is real but it is not free, and the running costs are the reason this is a bad idea for a business that is not yet profitable enough.

• Payroll has to be run properly — filings, deposits, W-2s, and a payroll service or the time to do it.
• A separate federal return, Form 1120-S, on a 15 March deadline rather than 15 April.
• A K-1 to every owner, which they cannot finish their personal return without.
• Basis tracking, which decides whether distributions and losses are tax-free or not.
• Eligibility limits: broadly, no more than 100 shareholders, only one class of stock, and shareholders must be individuals who are US citizens or residents, or certain trusts and estates.

Add those up and there is a profit level below which the election costs more than it saves. Where that line sits depends on your numbers, not on a rule of thumb from the internet.

The South Carolina layer

South Carolina recognizes the federal S election, so a business taxed as an S corporation federally is generally treated the same way by the state. Two state-specific points are worth raising with your CPA:

• South Carolina allows an election to tax active trade or business income at a flat rate instead of the graduated individual rates. It is made on Form I-335 and can matter for higher-income pass-through owners. The rate has been reduced in recent years — confirm the current one with the Department of Revenue rather than relying on a figure you read somewhere.
• South Carolina has withholding obligations relating to nonresident shareholders, which becomes relevant the moment an owner lives out of state.

Timing the election

Form 2553 is generally due no later than two months and fifteen days after the beginning of the tax year the election is to take effect, or at any time during the preceding tax year. Miss it and you are usually looking at the following year — though the IRS does provide relief for certain late elections where there was reasonable cause, under Revenue Procedure 2013-30.

The practical consequence is that this is a conversation to have early in a year, not in the following March when the return is being prepared.

When it is usually worth revisiting

• Profit has grown materially and is expected to stay there.
• You have taken on employees, or your role in the business has changed.
• Ownership is changing, or a new owner is joining.
• You are starting to think about selling — structure affects what a buyer will pay.
• You have begun operating in another state.

Entity choice is not a decision you make once at formation. It is worth checking against the numbers every few years, and always before a year in which something significant changes.