LLC vs. S-Corp — Complete Comparison Guide

LLC vs. S-Corp: The Core Tax Question

The LLC vs. S-Corp decision is one of the most common and consequential questions in small business tax planning. Both structures offer pass-through taxation — income flows to the owner's personal return and is not taxed at the entity level. The critical difference is self-employment tax treatment: LLC members pay SE tax on their entire share of business income, while S-Corp shareholder-employees pay SE tax only on their salary (not on distributions). For profitable businesses, this difference can mean tens of thousands of dollars annually.

The SE Tax Savings Calculation

The S-Corp advantage is straightforward to calculate:

• SE tax rate: 15.3% on net earnings up to $176,100 (2026), 2.9% above that
• S-Corp salary: Subject to payroll taxes (same as SE tax) on salary only
• S-Corp distributions: Not subject to payroll taxes

Example: A business owner with $200,000 net income:

• As LLC: SE tax on $200,000 = $176,100 × 15.3% + $23,900 × 2.9% = $26,933 + $693 = $27,626 SE tax (reduced by deductible half = $13,813 net cost)
• As S-Corp with $80,000 salary: Payroll taxes on $80,000 = $80,000 × 15.3% = $12,240 (split between employee and employer). Distributions of $120,000 = $0 SE tax. Annual savings = approximately $9,000-$12,000.

LLC vs. S-Corp Comparison Table

When S-Corp Makes Sense

The S-Corp election typically makes sense when:

• Net business income exceeds $50,000-$60,000 (the SE tax savings exceed the additional compliance costs)
• The owner can pay a reasonable salary of at least $40,000-$50,000 (IRS requires reasonable compensation)
• The business is stable and profitable (not a startup with losses)
• The owner wants to maximize retirement plan contributions (Solo 401(k) contributions can be made on W-2 salary)

When LLC Makes More Sense

The LLC structure is often better when:

• Net income is below $50,000 (SE tax savings don't justify compliance costs)
• The business has multiple owners with different ownership percentages (S-Corp one-class-of-stock rule is limiting)
• The business needs to bring in investors or foreign owners (S-Corp restrictions apply)
• The owner wants maximum flexibility in profit/loss allocations
• The business is in a startup phase with expected losses (LLC basis rules allow more loss deductibility)

The Break-Even Analysis

The break-even point for the S-Corp election depends on the additional compliance costs (payroll service, separate tax return, state fees) vs. SE tax savings. Typical compliance costs: $2,000-$4,000 annually for payroll + S-Corp return. SE tax savings at $100,000 net income with $50,000 salary: approximately $3,825. At $150,000 net income with $70,000 salary: approximately $6,120. The break-even is typically around $60,000-$80,000 in net income.

Reasonable Compensation — The IRS Scrutiny Point

The IRS actively audits S-Corps where shareholder-employees take little or no salary. The reasonable compensation standard requires that the salary reflect what a comparable employee would be paid for the same services. Factors include: the nature of the services, comparable salaries in the industry, the financial condition of the business, and the distribution history. Courts have consistently upheld IRS recharacterization of distributions as wages when salaries are unreasonably low.

LLC vs. S-Corp: The Core Difference

The LLC vs. S-Corp decision is one of the most consequential choices a small business owner makes — and one of the most misunderstood. The key insight: an LLC and an S-Corp are not mutually exclusive. An LLC is a state law entity (a legal structure). An S-Corp is a federal tax election (a tax classification). A business can be an LLC under state law and elect to be taxed as an S-Corp for federal purposes. This is the most common structure for small business owners who want the legal protections of an LLC with the tax benefits of an S-Corp.

Self-Employment Tax — The Core Issue

The primary reason to elect S-Corp status is to reduce self-employment (SE) tax. Here is how the math works:

The S-Corp election saves $16,000 annually by paying SE tax only on the $80,000 salary — not on the additional $120,000 in distributions. The $120,000 in distributions passes through to the owner's personal return and is subject to income tax, but not SE tax (15.3% on the first $176,100 for 2026; 2.9% above).

The Reasonable Compensation Requirement

The IRS requires S-Corp shareholder-employees to pay themselves a "reasonable" salary before taking distributions. This is the most audited aspect of S-Corp taxation. The IRS uses the following factors to determine reasonable compensation:

• What would the business pay an unrelated employee to perform the same services?
• Industry compensation surveys and data
• The ratio of salary to distributions (a 10% salary / 90% distribution split is a red flag)
• The owner's training, experience, and duties
• The size and complexity of the business

Safe harbor approach: Most practitioners recommend paying 40-60% of net profit as salary, with the remainder as distributions. For a business with $200,000 in net profit, a $80,000-$120,000 salary is typically defensible.

When the S-Corp Election Does NOT Make Sense

The S-Corp election is not always the right choice. Situations where an LLC taxed as a sole proprietorship or partnership is better:

• Net income under $40,000: The SE tax savings don't justify the additional compliance costs (payroll, Form 1120-S, state filing fees)
• Real estate rental income: Rental income is not SE income — no SE tax savings from S-Corp election on rental activities
• Businesses with significant losses: S-Corp losses are limited by stock basis; LLC losses may be more flexible
• Businesses seeking outside investment: S-Corps cannot have more than 100 shareholders, cannot have non-US citizen shareholders, and cannot have corporate shareholders — limiting investment options
• Businesses planning to sell: Asset sales from S-Corps can trigger built-in gains tax if the business was previously a C-Corp

LLC vs. S-Corp: State Considerations

The Conversion Process: LLC to S-Corp

Converting an existing LLC to S-Corp taxation requires:

1. Ensure the LLC meets S-Corp eligibility requirements (US citizens/residents only, max 100 members, one class of membership interest)
2. File Form 2553 (Election by a Small Business Corporation) with the IRS — due by March 15 of the year the election is to take effect, or within 75 days of formation for new entities
3. Set up payroll for the owner-employee (federal and state payroll tax registration, payroll processing)
4. Open a separate business bank account if not already done
5. File Form 1120-S annually (S-Corp income tax return) in addition to the owner's personal Form 1040

QBI Deduction Interaction

The §199A QBI deduction applies to both S-Corp distributions and sole proprietorship/partnership income. However, for S-Corps, the W-2 wages paid by the corporation count toward the W-2 wage limitation — which can increase the QBI deduction for high-income taxpayers. For businesses with income above the phase-out threshold ($394,600 MFJ for 2026), the S-Corp structure may produce a larger QBI deduction than a sole proprietorship.

LLC vs. S-Corp: The Definitive Tax Comparison for 2026

The LLC vs. S-Corp decision is one of the most consequential tax choices a small business owner makes, and it is one of the most frequently misunderstood. The right answer depends on net income level, industry, state of formation, long-term business goals, and the owner's specific tax situation. This guide provides the complete framework practitioners use to make this determination.

The Core Tax Difference: Self-Employment Tax

The fundamental reason to consider an S-Corp over a single-member LLC (taxed as a sole proprietorship) is self-employment (SE) tax. A sole proprietor pays SE tax of 15.3% on 100% of net business income up to the Social Security wage base ($176,100 for 2026) and 2.9% on income above that threshold. An S-Corp shareholder-employee pays SE tax (FICA) only on their W-2 salary — the remaining profit distributed as a shareholder distribution is not subject to SE tax.

Example: A consultant earns $200,000 in net business income. As a sole proprietor, SE tax is approximately $24,900 (15.3% × $176,100 + 2.9% × $23,900). As an S-Corp with a $100,000 reasonable salary, SE tax is approximately $15,300 (15.3% × $100,000) — a savings of $9,600. The S-Corp also pays the employer's share of FICA ($7,650), which is deductible, reducing the net savings to approximately $8,700 after accounting for the deductible employer FICA. After S-Corp formation and compliance costs (state filing fees, payroll processing, additional tax preparation), the net annual savings is typically $6,000–$8,000 for this income level.

The Break-Even Analysis: When Does S-Corp Make Sense?

The S-Corp election makes financial sense when the SE tax savings exceed the additional compliance costs. The additional annual costs of an S-Corp include: payroll processing ($500–$2,000/year), additional tax preparation for Form 1120-S and payroll returns ($1,000–$3,000/year), state filing fees and annual reports ($50–$800/year depending on state), and potentially higher accounting fees for bookkeeping. Total additional annual cost: typically $2,000–$5,000.

At a 15.3% SE tax rate, the break-even net income level is approximately $40,000–$60,000 above the reasonable salary. For most practitioners, the S-Corp election becomes clearly beneficial when net business income exceeds $80,000–$100,000 per year. Below $50,000 in net income, the additional compliance costs typically exceed the SE tax savings.

QBI Deduction Interaction

The §199A QBI deduction adds complexity to the LLC vs. S-Corp comparison. Both sole proprietors and S-Corp shareholders can claim the QBI deduction on qualified business income. However, the calculation differs: a sole proprietor's QBI is net self-employment income (after the SE tax deduction), while an S-Corp shareholder's QBI is the pass-through income from the S-Corp (not including W-2 wages paid to the shareholder).

For taxpayers above the §199A phase-out thresholds ($197,300 single / $394,600 MFJ for 2026), the W-2 wage limitation applies. The S-Corp structure can be advantageous here because the W-2 wages paid to the shareholder-employee count toward the W-2 wage limitation, potentially increasing the QBI deduction. A sole proprietor has no W-2 wages, so they rely entirely on the 25% of W-2 wages + 2.5% of qualified property limitation — which may be zero if they have no employees.

State Tax Considerations

State tax treatment of LLCs and S-Corps varies significantly and can override the federal analysis. California imposes an $800 minimum franchise tax on both LLCs and S-Corps, plus an additional LLC fee based on gross receipts (up to $11,790 for LLCs with gross receipts over $5 million). California also imposes a 1.5% S-Corp franchise tax on net income. New York City imposes an Unincorporated Business Tax (UBT) of 4% on net income of unincorporated businesses — S-Corps are not subject to the UBT, making the S-Corp election particularly valuable for NYC-based businesses. Texas imposes the franchise tax on both LLCs and S-Corps but exempts entities with revenue under $2.47 million.

Conversion from LLC to S-Corp: The Process

An existing LLC can elect S-Corp status by filing Form 2553 with the IRS. The LLC does not need to convert to a corporation — it remains an LLC for state law purposes but is treated as an S-Corp for federal tax purposes (a "QSub" or "check-the-box" election). The election must be filed by March 15 of the tax year for which it is to be effective (for calendar-year taxpayers), or within 75 days of the LLC's formation for a new entity. Late election relief is available under Rev. Proc. 2013-30 for up to 3 years and 75 days after the intended effective date.