An LLC is a legal business structure created under state law, while an S corp is a federal tax classification elected through the IRS. They are not the same category of thing, which is why the comparison confuses so many business owners. You can actually form an LLC and then elect S corp tax status, giving you both at once. Understanding how each one works, and when combining them makes sense, will help you choose the right setup for your business.
One Is a Business Structure, the Other Is a Tax Election
A limited liability company is an entity you register with your state. It gives you personal liability protection, meaning your personal assets are generally shielded if the business gets sued or can’t pay its debts. The IRS does not have its own tax rules specifically for LLCs. Instead, it treats a single-member LLC as a “disregarded entity” (taxed like a sole proprietorship) and a multi-member LLC as a partnership, unless the owners choose something different.
An S corporation is not something you register with your state. It’s a tax election you make with the IRS by filing Form 2553. Any qualifying LLC or corporation can elect S corp status, which changes how the business’s income is taxed at the federal level. So when people ask “should I be an LLC or an S corp,” they’re often comparing two things that can coexist. Many small businesses are structured as LLCs that have elected S corp taxation.
How Each One Is Taxed
A standard LLC is a pass-through entity. The business itself doesn’t pay federal income tax. Instead, profits flow through to your personal tax return, and you pay income tax at your individual rate. For a single-member LLC, you report business income on Schedule C. For a multi-member LLC, the business files a partnership return (Form 1065) and each member gets a Schedule K-1.
The catch with a default LLC is self-employment tax. All of your net business income is subject to Social Security and Medicare taxes, which together run 15.3% on the first chunk of earnings (the Social Security portion has an annual wage base cap) and 2.9% on everything above that.
An S corp is also a pass-through entity for income tax purposes. The business files Form 1120-S, and profits pass through to your personal return. The key difference is how self-employment taxes work. As an S corp shareholder-employee, you pay yourself a salary, and only that salary is subject to payroll taxes (FICA). Any remaining profit you take as a distribution is not subject to those payroll taxes. If your business earns $150,000 and you pay yourself a $70,000 salary, only the $70,000 gets hit with Social Security and Medicare taxes. The other $80,000 passes through as income you owe income tax on, but not the 15.3%.
The Reasonable Salary Requirement
The IRS is well aware that S corp owners have an incentive to pay themselves as little salary as possible and take the rest as distributions. That’s why it requires S corp shareholder-employees to receive “reasonable compensation” for the work they actually perform. Courts have repeatedly upheld this rule. In one case, a shareholder tried to take all compensation as distributions rather than wages, and the court ruled those payments were subject to employment taxes regardless of what the business called them.
Reasonable compensation means a salary comparable to what someone with your skills and experience would earn doing similar work for another company. There’s no exact formula, but the IRS looks at factors like job duties, time spent, the company’s revenue, and what comparable businesses pay for similar roles. Setting your salary too low is a red flag for an audit, and the IRS can reclassify distributions as wages and assess back taxes plus penalties.
Ownership Rules and Eligibility
LLCs have very few restrictions on who can be an owner. Members can be individuals, other LLCs, corporations, foreign nationals, or trusts. There’s no cap on how many members you can have, and you can create different classes of ownership with varying profit-sharing arrangements.
S corps are far more restrictive. To qualify, the business must:
- Be a domestic entity organized in the United States
- Have no more than 100 shareholders
- Have only one class of stock (though voting rights can differ)
- Limit shareholders to individuals, certain trusts, and estates with no partnerships, corporations, or non-resident aliens allowed
If your business has foreign investors, corporate partners, or you plan to bring on more than 100 owners, S corp status is off the table. These restrictions also mean S corps can’t easily take on venture capital or private equity investment, since those investors typically use corporate or partnership structures.
Paperwork and Ongoing Requirements
A standard LLC is relatively simple to maintain. Most states require an annual or biennial report filing and a fee, but LLCs generally don’t need to hold formal annual meetings, maintain a board of directors, or keep corporate minutes. Your operating agreement governs how the business runs, and you have flexibility in how you structure management.
An S corp, whether it started as a corporation or as an LLC that elected S corp status, carries more administrative weight. The IRS expects S corps to follow the operational formalities of a corporation. That means holding annual meetings of shareholders and directors, keeping formal minutes, adopting bylaws, and maintaining more extensive records. You also need to run payroll for any shareholder-employees, which means withholding income taxes, paying the employer’s share of FICA, filing quarterly payroll tax returns, and issuing W-2s at year end.
These requirements add real costs. Payroll processing, additional tax filings (the 1120-S return is more complex than a Schedule C), and the potential need for a bookkeeper or accountant all factor in. For a business earning under $40,000 or $50,000 in profit, the administrative costs of S corp status can easily eat up whatever you’d save on self-employment taxes.
When S Corp Tax Status Makes Sense
The S corp election typically starts saving money when your business consistently generates enough profit that the payroll tax savings on distributions exceed the added costs of running payroll and filing a more complex return. Most accountants put this crossover point somewhere around $50,000 to $80,000 in annual net profit, though it varies based on your specific situation and what constitutes reasonable compensation for your role.
S corp status works best for established businesses with predictable income. If your revenue swings wildly or you’re still in the early growth phase, the rigid salary requirements and extra paperwork can be more hassle than they’re worth. You also need to be comfortable paying yourself consistently through payroll, even during slow months.
How to Elect S Corp Status for Your LLC
If you already have an LLC and want S corp taxation, you file Form 2553 with the IRS. For the election to apply to the current tax year, you generally need to file within the first two months and 15 days of that tax year. If you miss the window, the election takes effect the following year, though the IRS does grant late-election relief in some circumstances.
You don’t need to change your state registration, dissolve your LLC, or form a new entity. Your LLC stays an LLC under state law, with all the liability protection and flexibility that comes with it. The only thing that changes is how the IRS taxes the business. This “LLC taxed as an S corp” combination is one of the most popular structures for profitable small businesses because it pairs the simplicity and asset protection of an LLC with the payroll tax savings of S corp taxation.