Difference Between LLC and S-Corp (2026)

Two Business Structures, One Critical Tax Decision

An LLC (Limited Liability Company) and an S-Corporation are often discussed as alternatives, but they are not the same type of entity. An LLC is a legal structure recognized by state law that provides liability protection and flexible management. An S-Corp is a tax election (IRS Subchapter S) that determines how the business is taxed at the federal level. The key insight: an LLC can elect to be taxed as an S-Corp. So the real question is not "LLC vs. S-Corp" — it is "should my LLC be taxed as a default partnership/sole proprietorship or elect S-Corp taxation?" This decision can save — or cost — you thousands of dollars per year in self-employment tax.

Side-by-Side Comparison

The Self-Employment Tax Savings: Why S-Corp Election Matters

The single biggest financial reason to elect S-Corp taxation is the self-employment tax savings. As a default LLC, 100% of your net business income is subject to the 15.3% self-employment tax. As an S-Corp, you pay yourself a "reasonable salary" (subject to 15.3% FICA) and take the remaining profit as "distributions" (not subject to SE tax). Example: a single-member LLC with $120,000 net income pays $16,778 in SE tax (15.3% × 92.35% × $120,000). The same business electing S-Corp taxation with a $70,000 salary pays $10,710 in FICA (15.3% × $70,000) plus $0 SE tax on the $50,000 distribution. Annual tax savings: $6,068. Over 20 years, that is $121,360 in SE tax savings — and the distributions are also exempt from the 0.9% Additional Medicare Tax for high earners, adding further savings.

What Is a "Reasonable Salary"?

The IRS requires S-Corp owners to pay themselves a "reasonable compensation" — a salary comparable to what an employer would pay for similar work in the same geographic area. You cannot set your salary at $10,000 and take $110,000 in distributions — the IRS will reclassify distributions as wages, plus penalties and interest. Factors the IRS considers: your role and responsibilities, time devoted to the business, comparable wages in your industry and location, and the company's revenue and profit. A software engineer consultant in San Francisco earning $150,000 net profit would have a hard time justifying a salary below $90,000. A retail business owner who manages the store might justify a $45,000 salary on $200,000 profit (because capital and employees generate much of the income). Rule of thumb: 50-70% of net income as salary is generally defensible; below 30% invites audit risk.

When S-Corp Election Makes Sense

• Net income above ~$60,000: Below this threshold, the cost of payroll processing ($500-1,500/year) and additional tax preparation ($500-1,500/year) often exceeds the SE tax savings.
• Consistent profitability: S-Corp election requires running payroll year-round, even in slow months. Erratic income makes this difficult.
• Single-owner service businesses: Consultants, freelancers, real estate agents, and medical professionals with high margins benefit most from the salary/distribution split.
• No plans for outside investors: S-Corps cannot have corporate or foreign shareholders — if you plan to raise VC funding, stay with LLC (or convert to C-Corp).

When to Stick With Default LLC Taxation

• Net income below ~$60,000: Compliance costs eat the tax savings.
• Real estate rental businesses: Rental income is generally not subject to SE tax anyway — S-Corp election provides no benefit and adds cost.
• Multiple owners with complex profit splits: S-Corps require one class of stock and pro-rata distributions. LLCs allow flexible profit allocation.
• Foreign owners or corporate members: S-Corps cannot have non-US or entity shareholders.
• Early-stage startups with losses: LLC losses pass through to offset other income on your personal return. S-Corp losses are limited to your stock basis, which can restrict deductions.

The Optimal Approach: LLC + S-Corp Election

The most common and recommended approach is: form an LLC for legal protection and flexibility, then elect S-Corp taxation by filing IRS Form 2553 (due within 2 months and 15 days of the start of the tax year you want it effective). This gives you the best of both: state-law LLC simplicity (no board of directors, no corporate formalities, no annual shareholder meetings) with federal S-Corp tax benefits (salary/distribution split, SE tax savings). You maintain the LLC legal structure while getting the S-Corp tax treatment. If you later need VC funding, you can revoke the S-Corp election and convert to C-Corp taxation.

Quick Summary

An LLC is a legal entity; S-Corp is a tax election. An LLC taxed as an S-Corp splits income into salary (taxed with FICA) and distributions (SE-tax-free), saving $3,000-$10,000+ per year in self-employment tax for businesses earning $60,000+. The trade-off is mandatory payroll, higher compliance costs ($1,000-3,000/year), and IRS scrutiny on "reasonable salary." For most profitable small businesses, the best setup is an LLC with S-Corp election.

References & Standards

• ASTM International. Steel & Alloy Standards. astm.org
• International Organization for Standardization (ISO). iso.org
• National Institute of Standards and Technology (NIST). Materials Data. nist.gov
• ASM International. Materials Information Society. asminternational.org
• World Steel Association. Steel Statistical Yearbook. worldsteel.org