S-corporations are one of the most frequently discussed (but often misunderstood) tax structures for small business owners. You’ve likely heard that they can help reduce taxes, especially self-employment taxes. And in some cases, that’s true. But the rules are nuanced, and the benefits aren’t automatic.

An S-corporation (or S-corp) isn’t a separate type of business entity. It is a tax classification that eligible businesses can elect by filing Form 2553 with the IRS. 

Many small businesses are already taxed as pass-through entities, meaning their income is reported on the owners’ personal tax returns and taxed at individual rates. Electing S-corp status doesn’t change that pass-through treatment. What it changes is how the income flowing through is characterized for tax purposes, particularly for owners who are actively involved in the business. 

This is a 101-level overview designed to answer common questions and clear up misconceptions about S corporations. It’s not a substitute for tax or legal advice. The goal is to help you understand the basics so you can have a more informed, productive conversation with your advisor if you’re thinking about making the election.

What is an S-corporation? 

An S-corporation isn’t a separate type of legal entity. It’s a tax election made under Subchapter S of the Internal Revenue Code. Both corporations and limited liability companies (LLCs) can apply for S-corp status if they meet eligibility requirements.

With an S-corp election, a business is treated as a pass-through entity for federal income tax purposes. But unlike a sole proprietorship or default LLC, an S-corp allows owner-employees to split income between:

• Wages (subject to payroll/FICA taxes), and 
• Distributions (which avoid FICA taxes and are generally not subject to income taxes unless they exceed the shareholder’s stock basis)

This structural split is what creates potential tax advantages, particularly for profitable businesses with actively involved owners.

Can I convert my LLC to an S-corp?

Many business owners start out as single-member LLCs and later elect S-corp status once the economics make sense for their situation. You’re not changing your legal entity; just how it’s taxed. 

There’s no hard threshold for when to make the switch, but the structure typically starts making sense when:

• You’re consistently earning net profit above what would be considered a reasonable salary
• You’re actively working in the business and prepared to take reasonable compensation as wages for your services
• You’re ready to take on the added responsibilities of running payroll and filing a separate corporate return (Form 1120-S)

If your income is modest, inconsistent, or your reasonable salary would consume most of your profit, it may make sense to wait before making the election.

Quick note on LLCs: “LLC” refers to a legal entity under state law, but for federal tax purposes, an LLC can be treated as a sole proprietorship (single-member), a partnership (multi-member), or a corporation (if an election is made). Most examples in this article assume a single-member LLC scenario to keep the math simple. If your LLC is taxed as a partnership, the same concepts apply, but the mechanics can differ – so you’ll want to model the election with your advisor. 

Why do some business owners elect S-corp status? 

The primary reason for electing S-corp status is the opportunity to reduce self-employment taxes, though the actual benefit depends heavily on the nature and profitability of the business. 

This is especially true for business owners who are currently taxed as sole proprietors or default LLCs, where all net income is subject to self-employment tax. 

If your business is taxed as a C-corporation, the motivation can be different: C-corps generally pay tax at the corporate level, and shareholders can pay tax again when profits are distributed as dividends. An S-corp election (for eligible corporations) is one way to shift from a “two-level” tax structure to a pass-through structure, where income is generally taxed once at the shareholder level. For many closely held corporations that expect to distribute most of their profits to owners, that shift (moving away from double taxation) can be a primary reason to elect S-corp status. 

Understanding FICA taxes

To understand an S-corp, it helps to understand how FICA (Federal Insurance Contributions Act) taxes work. These taxes fund Social Security and Medicare and work the same way whether you’re an employee or self-employed – but who pays them differs.

For W-2 employees, FICA taxes are split: the employee pays 7.65% (6.2% for Social Security, 1.45% for Medicare), and the employer matches that with another 7.65%.

For self-employed individuals (sole proprietors and single-member LLC owners), you pay both the 7.65% employee and employer shares, since you are considered both the employee and the employer, resulting in a total of 15.3% self-employment tax.  

Note: Social Security tax applies only to wages up to an annual cap ($184,500 for 2026), while Medicare tax applies to all earnings. An additional 0.9% Medicare surtax may apply to higher earners.

How an S-corp changes the tax structure

An S-corp allows owners who actively work in the business to pay themselves a reasonable W-2 salary and then take additional profits as distributions. Here’s how that affects FICA taxes:

• The salary is treated just like any other employee’s wages – subject to payroll tax (FICA), split between the employee and employer (though both portions are ultimately paid from your business).
• The distributions, however, are not subject to FICA taxes.

This allows a business owner to limit FICA exposure to only the portion of income paid as wages, potentially reducing total payroll tax liability, as long as the salary is reasonable for the work performed.

Side-by-side comparison

Let’s say a business generates $150,000 in net income, and the owner is actively working in the business.

Sole Proprietor/Default LLC:

• Entire $150,000 subject to self-employment tax (15.3%)
• Self-employment tax: $22,950
• The full $150,000 is also included in the owner’s taxable income and subject to federal (and possibly state) income tax, based on the owner’s individual tax situation. 

S-Corporation (with $100,000 reasonable salary):

• $100,000 salary subject to payroll tax (15.3%): $15,300
• $50,000 distribution: $0 in FICA taxes
• The full $150,000 is still included in the owner’s taxable income, just as it would be in the sole proprietor scenario. 

Payroll tax savings (before other adjustments): approximately $7,650.

Note: sole proprietors generally receive an above-the-line deduction for half of their self-employment tax, which can slightly reduce taxable income and narrow the net difference when comparing total tax cost. 

This split doesn’t necessarily reduce income tax; it changes how payroll taxes apply. That distinction can create planning opportunities for businesses that consistently earn more than what would be considered a reasonable wage for the owner’s role. 

Reasonable compensation is non-negotiable

If you’re an S-corp owner who actively works in the business, the IRS expects you to pay yourself a reasonable salary before taking any distributions. This is one of the most important (and most scrutinized) requirements of the S-corp structure.

But what exactly counts as “reasonable”?

The IRS doesn’t provide a fixed formula or salary table. Instead, it expects business owners to base compensation on what they would pay someone else to do the same job under similar circumstances. Factors to consider include:

• Industry standards for comparable roles
• Geographic location and cost of living
• The size, complexity, and profitability of the business
• Your role and responsibilities
• Time spent actively working in the business

For example, a solo consultant generating $150,000 in net income might reasonably take a salary of $70,000–$90,000, depending on their experience, hours worked, and market norms. But a physician earning the same amount may be expected to take a significantly higher salary due to specialized training and licensing. 

There’s no bright-line test, but undercompensating yourself increases the risk of IRS scrutiny. If the IRS determines that your salary is unreasonably low, it can reclassify prior distributions as wages, assess back payroll taxes, and impose penalties.

Determining your reasonable salary

To support your salary, it’s helpful to research market compensation using resources like the Bureau of Labor Statistics (BLS), Glassdoor, or industry-specific surveys – and to document factors such as your role, hours worked, credentials, and the complexity and profitability of your business. A CPA can help you develop a defensible salary figure that balances tax efficiency with compliance. 

How do I pay myself from an S-corp? 

When paying yourself from an S-corp, you’ll need to run payroll, just like a regular employer – even if you’re the only employee. That means withholding federal and state income and unemployment taxes, Social Security and Medicare taxes, and issuing yourself a W-2 at year-end. Most S-corp owners use a payroll service to manage this.

After your salary is paid, any remaining business profit can be taken as distributions. These are not subject to self-employment tax, but they do reduce your basis in the S-corp.

Distributions are generally a return of previously taxed earnings and don’t trigger additional tax unless they exceed your basis. Here’s what that means: 

Your basis in an S-corp starts with your initial investment and increases when the company earns income (which you pay taxes on) or you contribute additional capital. It decreases when you take distributions or the company has losses. If you take out more than your basis, the excess is taxed as a capital gain. 

What are the limitations of an S-corp? 

While S-corps can offer tax planning opportunities in the right context, the structure isn’t suitable for every business. There are several important limitations to be aware of. 

First, only U.S. citizens or resident aliens can be shareholders. S-corps are also limited to a maximum of 100 shareholders and may only issue one class of stock, which can limit flexibility in ownership structures and profit-sharing arrangements. Certain types of businesses, such as some financial institutions and insurance companies, are not eligible to elect S-corp status at all.

Beyond these eligibility restrictions, the S-corp structure may not be a good fit for businesses that are operating at a loss, because losses can only be deducted to the extent of your basis, which does not include entity-level debt. 

If your business is still ramping up, operating at a loss, or reinvesting heavily in growth, the tax benefits of an S-corp may be limited or nonexistent in the short term. 

Administrative requirements

S-corps require maintenance, including: 

• Monthly or quarterly payroll processing
• Separate corporate tax return (Form 1120-S) in addition to your personal return
• Stricter bookkeeping and accounting requirements, including maintaining corporate records such as meeting minutes
• Potential state-level taxes or fees in some jurisdictions

These ongoing costs and complexity mean S-corp status only makes financial sense when the tax savings outweigh the additional administrative burden. 

Is an S-corp right for you? 

S-corps offer a unique blend of pass-through taxation and structured compensation. But they’re not automatically advantageous, and they’re not designed for every business.

If you’re earning strong profits, actively involved in your business, and ready to formalize how you pay yourself, it may be worth exploring the switch. But like most tax strategies, it’s not one-size-fits-all.

Before you file anything with the IRS, contact one of our expert advisors. We’ll help you run the numbers, weigh the trade-offs, and determine whether an S-corp election makes sense for your goals.