S-Corp vs. LLC in California 2026 – Tax Treatment, Structures, and Key Differences

For business owners and self-employed individuals in California, the choice between an S corporation (S-Corp) and a limited liability company (LLC) involves distinct federal and state tax consequences that are governed by separate regulatory frameworks. At the federal level, S-Corp treatment is governed by Subchapter S of the Internal Revenue Code (IRC §§1361–1379) (accessed May 25, 2026), while LLCs are generally treated as disregarded entities, partnerships, or corporations depending on their elections under the check-the-box regulations at Treasury Regulation §301.7701 (accessed May 25, 2026). In California, both structures are subject to additional taxes, fees, and filing obligations administered by the Franchise Tax Board (FTB) (accessed May 25, 2026) that do not have direct federal equivalents.

This article provides an educational overview of the structural and tax differences between S-Corps and LLCs in California as they generally apply under 2026 law. This publication reflects tax law and regulations applicable as of May 2026 and is subject to change without notice. It does not address any specific taxpayer facts or circumstances.

Federal Tax Classification — S-Corps and LLCs

Under federal law, an S corporation is a domestic corporation that has made a valid election under IRC §1362 using IRS Form 2553 (accessed May 25, 2026) to be treated as a pass-through entity. Income, deductions, credits, and losses generally flow through to shareholders and are reported on their individual returns. The corporation itself generally does not pay federal income tax at the entity level, subject to limited exceptions such as built-in gains tax under IRC §1374 and excess passive income tax under IRC §1375.

A single-member LLC is generally treated as a disregarded entity for federal income tax purposes, meaning its income and expenses are reported directly on the owner's individual return (typically Schedule C for a sole proprietorship or Schedule E for rental activity). A multi-member LLC is generally treated as a partnership by default, filing Form 1065 (accessed May 25, 2026) and issuing Schedule K-1s to members. An LLC may elect to be taxed as a corporation — including as an S corporation — by filing the appropriate election forms with the IRS.

S-Corp Eligibility Restrictions Under IRC §1361

Not all businesses qualify for S-Corp status. Under IRC §1361 (accessed May 25, 2026), an S corporation generally must satisfy all of the following requirements:

• Be a domestic corporation
• Have no more than 100 shareholders
• Have only one class of stock
• Have only eligible shareholders — generally, U.S. citizens, permanent residents, certain trusts, and estates (partnerships, corporations, and non-resident aliens generally may not be shareholders)
• Not be an ineligible corporation (certain financial institutions, insurance companies, and international sales corporations are excluded)

An LLC that elects S-Corp status must still satisfy all of these requirements in its operating structure. Failure to maintain eligibility requirements after election may result in involuntary termination of S-Corp status under IRC §1362(d).

California Tax Treatment — Key Differences

California imposes separate taxes and fees on both S-Corps and LLCs that are administered by the FTB (accessed May 25, 2026). These California-specific obligations are independent of federal tax treatment and may affect the relative cost of each structure under California law.

S-Corp: California Franchise Tax and 1.5% Net Income Tax

California S corporations are subject to a franchise tax equal to the greater of:

• $800 minimum franchise tax per year (applicable to most entities registered in California), or
• 1.5% of the California net income of the S corporation

This 1.5% tax is assessed at the entity level on the S corporation's California net income, in addition to the pass-through income that flows to shareholders and is taxed at the individual level. Per the FTB S Corporation page (accessed May 25, 2026), S corporations file California Form 100S and are subject to the same estimated tax payment requirements as other entities.

LLC: Annual Minimum Tax and Gross Receipts Fee

California LLCs are subject to two separate state-level obligations under the California Revenue and Taxation Code:

• $800 annual minimum franchise tax — due for most LLCs registered or doing business in California, regardless of income or profitability.
• Annual LLC fee — a gross receipts-based fee assessed on total California income, on a sliding scale. Per the FTB LLC page (accessed May 25, 2026), the fee generally ranges from $0 for income under $250,000 to $11,790 for income of $5,000,000 or more. These thresholds are subject to annual adjustment and should be verified directly with the FTB.

Unlike the S-Corp 1.5% entity-level tax, the LLC fee is based on gross receipts rather than net income, which may result in a material fee obligation even in years where the LLC is not profitable.

Self-Employment and Payroll Tax Considerations

One of the commonly discussed differences between S-Corps and LLCs relates to self-employment tax treatment. Under current federal law:

LLC Members — General Rule

Active members of a multi-member LLC treated as a partnership are generally subject to self-employment tax on their distributive share of ordinary business income under IRC §1402. For 2026, self-employment tax is generally assessed at 15.3% on net earnings up to the Social Security wage base (adjusted annually) and 2.9% on amounts above that threshold. An additional 0.9% Medicare surtax may apply to higher-income individuals under IRC §3101(b)(2). Per IRS Publication 334 (2026) – Tax Guide for Small Business (accessed May 25, 2026), self-employment tax applies to the net earnings from self-employment reported on Schedule SE.

S-Corp Shareholders — General Rule

S-Corp shareholder-employees generally pay FICA payroll taxes only on their W-2 wages, not on S-Corp distributions received in excess of wages. Distributions from the S corporation are not subject to self-employment tax or FICA under current law, provided the shareholder has received reasonable compensation for services rendered. This structural difference is the basis for the frequently discussed potential payroll tax savings associated with S-Corp treatment — however, as noted above, the IRS scrutinizes arrangements where reasonable compensation is not paid.

Compliance Resources and Tools

Official IRS and FTB publications and forms relevant to S corporations and LLCs are publicly available at no cost. These resources may be useful for general educational reference:

• IRS — S Corporations: overview of federal S-Corp requirements, eligibility, and election procedures, including links to Form 2553 and Form 1120-S (accessed May 25, 2026).
• IRS — Limited Liability Company (LLC): educational overview of federal LLC classification rules, check-the-box elections, and relevant filing forms (accessed May 25, 2026).
• IRS Form 1120-S — U.S. Income Tax Return for an S Corporation: the federal annual return for S corporations, with instructions (accessed May 25, 2026).
• IRS Form 1065 — U.S. Return of Partnership Income: the federal annual return for multi-member LLCs taxed as partnerships, with instructions (accessed May 25, 2026).
• FTB — S Corporations: California-specific guidance on S-Corp registration, Form 100S, the 1.5% entity-level tax, and the $800 minimum franchise tax (accessed May 25, 2026).
• FTB — Limited Liability Companies: California LLC annual tax, gross receipts fee schedule, Form 568, and registration requirements (accessed May 25, 2026).
• IRS — S-Corp Compensation and Medical Insurance Issues: IRS guidance on reasonable compensation requirements for shareholder-employees (accessed May 25, 2026).

These resources are provided for general educational reference only. Applicable forms, fee schedules, and regulatory guidance are updated periodically. Taxpayers are encouraged to access the most current version of each document directly from IRS.gov and FTB.ca.gov.