LLC vs. S-Corp: Understanding the Tax Election Behind the Legal Structure

If you own a small business or are thinking about launching one, you’ve probably run into the question: “Should I be an LLC or an S-Corp?” It comes up constantly, and the framing itself causes most of the confusion.

The two aren’t competing options. An LLC is a legal entity formed at the state level. An S-Corp is a federal tax election made with the IRS. You can have one without the other, and in many cases you’ll have both working together. As an Enrolled Agent, my focus is on the tax side of that equation: when the S-Corp election actually saves money, what it costs to maintain, and where business owners get tripped up.

Here’s how I think about it.

The LLC: A State-Level Legal Entity

An LLC (Limited Liability Company) is created when you file Articles of Organization with your state. It establishes your business as a legal entity separate from you personally, which is what gives you liability protection if the business is sued or takes on debt.

By default, the IRS doesn’t recognize an LLC as its own tax classification. Instead, it taxes your LLC based on how many owners you have:

– A single-member LLC is taxed as a sole proprietorship (Schedule C)

– A multi-member LLC is taxed as a partnership (Form 1065)

In both cases, all of the net profit flows through to the owners’ personal returns and is subject to self-employment tax (15.3% on the first $184,500 of earnings for 2026, then 2.9% Medicare on everything above that, plus the 0.9% Additional Medicare Tax at higher income levels).

For many newer or smaller businesses, this default treatment is the right call. It’s simple, requires no payroll infrastructure, and doesn’t trigger additional filing obligations.

The S-Corp: A Federal Tax Election

An S-Corp isn’t an entity you form. It’s a tax election under Subchapter S of the Internal Revenue Code. Both LLCs and state-law corporations can elect to be taxed as S-Corps by filing Form 2553 with the IRS.

The election changes how your business income is taxed, not your legal structure. Once elected, the business must:

1. Pay the owner-employee a **reasonable salary** through formal payroll, subject to FICA taxes (Social Security and Medicare)

1. File **Form 1120-S** annually, along with K-1s for each shareholder

1. Distribute remaining profits as **shareholder distributions**, which are not subject to self-employment or payroll tax

That second piece, the distribution treatment, is where the tax savings come from. Self-employment tax only applies to the salary portion, not the distributions.

S-Corp Eligibility Rules

The IRS places real limits on who can elect S-Corp status:

– No more than 100 shareholders

– Shareholders must be U.S. citizens or resident aliens (with limited exceptions for certain trusts and estates)

– Only one class of stock is permitted

– Most corporations and partnerships cannot be shareholders

These rules matter. If your ownership structure doesn’t fit, the election isn’t available, and a violation can terminate S status retroactively.

When Does the S-Corp Election Actually Pay Off?

This is the question worth focusing on. The S-Corp election adds real cost and complexity, so the savings need to clear that hurdle before it makes sense.

The general rule of thumb in the industry is that net profit (after a reasonable salary) needs to clear roughly $40,000 to $60,000 per year before the savings reliably exceed the added costs. But the actual breakeven depends on:

– **Reasonable compensation in your industry and role.** The IRS expects the salary to reflect what you’d pay someone else to do the same job. Salary that’s set too low is the most common audit issue for S-Corps.

– **Your state’s tax treatment.** Some states tax S-Corps at the entity level or impose minimum franchise taxes that erode the federal savings.

– **Payroll and accounting costs.** Running payroll, filing Form 1120-S, and producing K-1s typically adds $1,500 to $3,000 per year in administrative costs.

– **Qualified Business Income (QBI) deduction interaction.** The Section 199A deduction is calculated differently for S-Corp owners than for sole proprietors, and a higher salary reduces the QBI base. The math isn’t always in favor of the election, particularly for specified service businesses near the income phaseout thresholds.

The Reasonable Compensation Issue

If you take only one thing from this post, take this: the S-Corp election lives or dies on reasonable compensation.

The IRS knows the S-Corp structure can be used to under-pay salary and over-pay distributions to dodge payroll tax. They audit for it. When they find it, they reclassify distributions as wages and assess back payroll taxes, penalties, and interest.

To support a reasonable salary, you want documentation: comparable salary data for your role, time spent on income-producing work versus passive ownership activities, and a defensible methodology. Tools like RCReports exist specifically for this, and most tax professionals working with S-Corp clients use one.

Note that this is a tax compliance issue, not a legal asset protection issue. Failing to pay reasonable compensation creates IRS exposure but doesn’t, on its own, pierce the corporate veil that your LLC provides. Those are two separate doctrines, and they’re worth keeping straight.

The Hand-Off Between Legal and Tax

The cleanest workflow I’ve seen is this:

1. Form the LLC at the state level with proper formation documents and an operating agreement. This is the legal foundation.

2. Run the numbers on the S-Corp election once the business has consistent profitability. This is the tax decision.

A good attorney builds the entity. A good tax professional pressure-tests whether the S-Corp election earns its keep year after year.

The Bottom Line

The LLC versus S-Corp question is really two questions stacked on top of each other. The first is legal: what entity structure protects your personal assets and supports how you want to run the business? The second is tax: given that structure, what election produces the best after-tax outcome?

Treating them as one decision tends to produce premature S-Corp elections, underpaid owners, and audit exposure that swamps any tax savings. Treating them as two sequential decisions, with the right professional handling each, is how you actually keep more of what you earn.

If you’re trying to figure out whether the S-Corp election makes sense for your situation, the math is specific to your numbers. There’s no universal threshold, and anyone who quotes one without seeing your P&L is guessing.

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