S-Corp vs LLC: Tax Implications Every Small Business Owner Should Know

The key tax difference between an S-Corp and LLC: LLC owners pay self-employment tax at 15.3% on all net business profit. S-Corp owners pay self-employment tax only on their reasonable salary — distributions above that salary are exempt. For business owners generating $80,000 or more in annual net profit, S-Corp election typically produces meaningful tax savings. The breakeven point depends on reasonable compensation requirements, state taxes, and annual filing costs.

The question comes up in almost every tax planning conversation for growing small business owners: should I be an LLC or an S-Corp? The honest answer is that it depends on your income level, your state, and whether the administrative requirements are worth the savings. The oversimplified version that circulates on social media, that S-Corps always save you money, is wrong in enough cases to be dangerous.

This guide covers the actual tax mechanics, when S-Corp election makes sense, when it does not, and the California-specific considerations that most generic articles miss entirely.

LLC vs. S-Corp: The Structural Basics

Before getting to taxes, it helps to understand what these designations actually are.

An LLC (Limited Liability Company) is a legal structure created at the state level that provides personal liability protection for its owners. By itself, an LLC has no default federal income tax classification. A single-member LLC is taxed as a sole proprietorship by default. A multi-member LLC is taxed as a partnership by default. These are pass-through structures: business income flows to the owner’s personal return and is subject to income tax and, for active business owners, self-employment tax.

An S-Corp is a tax election, not a separate legal entity. A business can elect S-Corp status by filing IRS Form 2553. The election tells the IRS to treat the entity’s income as flowing through to shareholder returns in proportion to ownership, with the added feature that only wages paid to shareholder-employees are subject to self-employment and payroll taxes. Distributions above the salary are not.

Most small businesses that elect S-Corp status do so by forming an LLC at the state level and then making the S-Corp tax election with the IRS. The business remains an LLC legally. It is treated as an S-Corp for federal tax purposes.

The Core Tax Difference: Self-Employment Tax

This is the mechanism that drives almost every S-Corp election decision.

Self-employment tax is the combined Social Security and Medicare tax that self-employed individuals pay. The rate is 15.3% on the first $176,100 of net earnings in 2026 (Social Security component, 12.4%) plus 2.9% on all net earnings above that threshold (Medicare component), with an additional 0.9% Medicare surcharge on earnings above $200,000 for single filers and $250,000 for joint filers.

For a sole proprietor or single-member LLC owner with $120,000 of net business income, the self-employment tax alone is approximately $16,955 before income tax. That is on top of whatever federal and state income tax applies to the same $120,000.

An S-Corp owner in the same situation pays payroll taxes (the employer and employee equivalent of self-employment tax) only on their reasonable salary. If the IRS considers $70,000 a reasonable salary for that business, the owner pays payroll taxes on $70,000 and takes the remaining $50,000 as a distribution. The distribution is not subject to Social Security or Medicare tax.

The savings in that scenario: payroll taxes on $50,000 avoided, which at the combined 15.3% rate is approximately $7,650 per year, less the additional accounting and payroll processing costs associated with running payroll and filing an 1120-S return.

When S-Corp Election Makes Sense

S-Corp election makes financial sense when the self-employment tax savings exceed the incremental costs of the election. Those costs include:

• Payroll processing for the owner’s salary (quarterly 941 filings, year-end W-2)
• Preparation of Form 1120-S (the S-Corp return), which is more complex and costly than Schedule C
• State-level S-Corp taxes and fees where applicable

The breakeven point varies, but most tax advisors put it at net business profit of $60,000 to $80,000 per year for a single-owner business. Below that level, the incremental compliance costs often consume the tax savings. Above $80,000, the savings typically exceed the costs meaningfully, and the case for election strengthens as income grows.

These figures assume a single-owner service business with one employee (the owner). Multi-owner businesses and businesses with complex payroll structures have different math.

What Is Reasonable Compensation?

The IRS requires S-Corp shareholder-employees to pay themselves a reasonable salary before taking distributions. This requirement is what makes the S-Corp strategy work and what limits it.

Reasonable compensation is defined as what a similarly situated business would pay an unrelated employee to perform the same services. It is not the minimum salary you can get away with. It is not $1 per year. The IRS has pursued and won cases against S-Corp owners who paid themselves unreasonably low salaries to avoid payroll taxes.

Factors the IRS considers: the owner’s role in the business, hours worked, training and experience, industry compensation norms, and what the business paid or would pay for similar services from a third party. For a physician, attorney, or financial advisor, reasonable compensation is typically high relative to business income. For a business owner in a capital-intensive industry where profits come primarily from the business’s assets rather than the owner’s labor, reasonable compensation may be lower.

Setting reasonable compensation incorrectly in either direction creates risk. Too low, and the IRS reclassifies distributions as wages and assesses back payroll taxes, penalties, and interest. Too high, and you lose the tax benefit of the S-Corp election by subjecting more income to payroll taxes than necessary.

This is why S-Corp elections are not a do-it-yourself project. The reasonable compensation determination requires judgment, documentation, and someone who understands IRS scrutiny patterns in your industry.

California S-Corp vs. LLC: What Other Guides Miss

If your business operates in California, the federal S-Corp analysis is only part of the picture. California has its own tax treatment of S-Corps that makes the calculation materially different from most other states.

California S-Corp franchise tax. California charges S-Corps a franchise tax of 1.5% of net income, with a minimum of $800 per year. This applies in addition to the personal income tax shareholders pay on S-Corp income flowing through to their returns. A business with $200,000 of net income in California pays $3,000 in California S-Corp franchise tax, on top of all other taxes.

California LLC fee. LLCs in California that do not elect S-Corp status pay the $800 minimum franchise tax plus a graduated LLC fee based on gross receipts: $900 for gross receipts of $250,000 to $499,999, $2,500 for $500,000 to $999,999, $6,000 for $1,000,000 to $4,999,999, and so on. At lower income levels where the gross receipts fee is minimal, the LLC fee structure may be less burdensome than the S-Corp franchise tax.

The California break-even calculation. For California businesses, the S-Corp election analysis must include the 1.5% franchise tax offset against the payroll tax savings. For a California business with $150,000 in net income, the additional state franchise tax is $2,250. The federal SE tax savings might be $8,000 to $10,000. The net benefit is still positive, but the California penalty reduces it meaningfully compared to a business in Texas or Georgia, which have no equivalent tax.

ClearPath’s tax planning services for Walnut Creek businesses run this analysis as a standard part of entity structure review for California clients.

Downsides of S-Corp Election

S-Corp election is not the right choice for every business, and there are real downsides beyond the compliance costs.

Ownership restrictions. S-Corps cannot have more than 100 shareholders, cannot have non-US citizen or resident alien shareholders, and cannot have corporate shareholders. If you plan to bring in outside investors, particularly institutional investors, the S-Corp structure limits your options.

Single class of stock. S-Corps can only have one class of stock. This prevents the kind of preferred stock arrangements that are standard in venture-backed companies. Businesses with growth capital plans often convert from S-Corp to C-Corp before raising a Series A.

Payroll administration. Running payroll for an owner adds an ongoing administrative obligation: quarterly 941 filings, state payroll filings, unemployment insurance, year-end W-2 issuance. For a sole proprietor who previously filed only Schedule C, this is a material increase in accounting and compliance workload.

State conformity varies. Not all states recognize S-Corp status. Some states tax S-Corp income at the entity level regardless of the federal pass-through treatment. Understanding your specific state’s treatment before electing is essential.

How to Elect S-Corp Status

To elect S-Corp status, an eligible entity files IRS Form 2553 with the IRS. The election must be filed by the 15th day of the third month of the tax year for which it is to be effective, or at any time during the preceding tax year. For a calendar-year business that wants S-Corp status effective January 1, 2027, the election must be filed by March 15, 2027, or at any point in 2026.

Late election relief is available in many circumstances, but it requires a reasonable cause explanation and IRS approval. The cleaner path is to file on time.

Before filing, confirm:

• The entity is eligible (US entity, 100 or fewer shareholders, only allowable shareholders, one class of stock)
• You have determined reasonable compensation with documentation
• Your state’s treatment of S-Corp income is factored into the analysis
• Your bookkeeping and payroll systems are ready to handle the election before it takes effect

ClearPath’s business tax preparation services and tax planning for Brooklyn businesses include entity structure analysis, Form 2553 preparation, and reasonable compensation documentation as part of our tax advisory engagements.

Frequently Asked Questions

What is the tax difference between an S-Corp and an LLC?

An LLC owner pays self-employment tax (15.3% up to the Social Security wage base, 2.9% above) on all net business profit. An S-Corp owner pays payroll taxes only on their reasonable salary. Distributions above the salary are not subject to self-employment or payroll taxes. This difference is the primary tax benefit of S-Corp election.

How much can I save in taxes with an S-Corp?

The savings depend on net business profit and what constitutes reasonable compensation for your role. At $120,000 of net profit with a $70,000 reasonable salary, the S-Corp saves approximately $7,650 in self-employment taxes. At $200,000 of net profit, savings can exceed $12,000. Incremental compliance costs of $2,000 to $4,000 must be subtracted to get the net benefit.

What is reasonable compensation for an S-Corp owner?

Reasonable compensation is what a similarly qualified, unrelated employee would be paid to perform the same services. It is based on your role, industry norms, hours worked, and the nature of your business’s profits. The IRS requires documentation. Setting it too low invites reclassification of distributions as wages; setting it unnecessarily high eliminates the tax benefit.

Can an LLC elect S-Corp status?

Yes. Most businesses that elect S-Corp status remain LLCs at the state level and elect S-Corp tax treatment by filing IRS Form 2553. The legal structure stays the same. Only the federal tax treatment changes.

When does S-Corp election make financial sense?

Most tax advisors recommend evaluating S-Corp election once net business profit reaches $60,000 to $80,000 per year. Below that threshold, the additional compliance costs (payroll, 1120-S preparation) often consume the tax savings. Above $80,000, the net benefit is typically clear and grows as income increases.

What are the downsides of S-Corp election?

Downsides include ownership restrictions (maximum 100 shareholders, no foreign shareholders, no corporate shareholders), single class of stock requirement, ongoing payroll administration obligations, and state-level taxes that may offset some federal savings, particularly in California where a 1.5% franchise tax applies.

How are S-Corp distributions taxed?

S-Corp distributions to shareholders are generally not subject to self-employment or payroll taxes. They flow through to the shareholder’s personal return and are taxed as ordinary income at the federal and state level, but without the additional 15.3% self-employment tax layer. This is the mechanism that produces the tax savings.

Does California treat S-Corps differently than the federal government?

Yes. California imposes a 1.5% franchise tax on S-Corp net income with an $800 minimum. This is in addition to the personal income tax shareholders pay on pass-through income. California also has its own LLC fee structure based on gross receipts. The California-specific analysis often produces a different breakeven point than the federal analysis alone.

What are the filing requirements for an S-Corp?

S-Corps file Form 1120-S annually. Shareholder-employees must receive a W-2 for their salary and a Schedule K-1 for their share of S-Corp income. The business must file quarterly payroll returns (Form 941) and state equivalents. These requirements are more extensive than a Schedule C sole proprietorship and require either a bookkeeper, payroll service, or both.

Should I hire a CPA or tax advisor to set up my S-Corp?

Yes. The reasonable compensation determination, Form 2553 timing, state conformity analysis, and payroll setup all require professional judgment. The cost of getting it wrong, through IRS reclassification, late election penalties, or state non-compliance, typically exceeds the cost of professional advice. S-Corp election is one of the decisions where DIY creates more risk than it saves.

The Bottom Line

S-Corp election is a legitimate and often significant tax strategy for profitable small business owners. It is not a universal solution, and it requires ongoing compliance that has real costs. The decision should be made based on your specific income level, your state’s tax treatment, your ownership structure, and your growth plans, not based on what worked for someone else’s business.

For business owners in New York and California especially, the state tax layer makes the analysis more complex than most generic guides suggest. Getting it right the first time, with proper documentation and professional guidance, is worth far more than the cost of the advice.

ClearPath CFO Advisory provides entity structure analysis, tax planning, and business tax preparation for small businesses across Brooklyn, Walnut Creek, Dallas, Atlanta, and beyond. Our fractional CFO services include ongoing financial strategy support for businesses navigating growth, entity structure decisions, and multi-state tax complexity.

Want to know if S-Corp election makes sense for your business? Contact ClearPath CFO Advisory for a free consultation