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The S-corporation is one of the most common business structures for small businesses across the country — a pass-through entity that avoids corporate double-taxation while providing payroll tax savings for profitable businesses. In California, the S-corporation calculus is different from most states because California imposes an additional 1.5% tax on S-corporation net income that doesn’t apply to LLCs or sole proprietorships. Understanding when the S-corporation structure helps and when it hurts in California requires running the specific numbers for your situation.
How S-Corporations Save on Payroll Taxes
In a sole proprietorship or single-member LLC, all net business income is subject to self-employment tax — 15.3% on the first $168,600 (2024) and 2.9% on amounts above that. An owner-operator generating $200,000 in net income from a sole proprietorship pays approximately $27,000 in self-employment tax in addition to income tax.
An S-corporation allows the owner-operator to split their compensation between a “reasonable salary” — subject to payroll taxes — and a distribution — not subject to payroll taxes. An S-corp owner generating $200,000 in net business income who pays herself a reasonable salary of $100,000 (subject to payroll taxes) and takes the remaining $100,000 as a distribution (not subject to payroll taxes) saves approximately $13,500 in federal self-employment tax relative to the sole proprietorship structure.
The California S-Corp Tax Complication
California imposes a 1.5% tax on S-corporation net income — the “built-in gains tax” equivalent that partially offsets the federal payroll tax savings. On $200,000 in S-corp net income, the California S-corp tax is $3,000. This partially reduces the federal payroll tax savings but doesn’t eliminate them — the net benefit of S-corp election in California is still positive for most businesses generating more than approximately $40,000–$50,000 in net income annually.
The S-corp tax is calculated on net income after deducting the reasonable salary. An S-corp paying its owner a $100,000 salary and generating $200,000 in total income has net S-corp income of $100,000, generating a California S-corp tax of $1,500. The comparison against the LLC’s $800 minimum franchise tax (or the gross receipts-based LLC fee for larger companies) requires specific calculation for your income level.
The S-Corporation Conversion
California LLCs can elect S-corporation treatment for federal tax purposes by filing IRS Form 2553. The California S-corp election is generally made simultaneously. This conversion does not require forming a new corporation — the LLC remains an LLC for state law purposes while being treated as an S-corporation for federal and California income tax purposes. This “LLC taxed as S-corp” structure has become increasingly common for California small businesses because it combines the liability and operational flexibility of an LLC with the payroll tax advantages of S-corp treatment.
The practical considerations: S-corp status requires maintaining a payroll for the owner (including payroll tax filings, withholding, and W-2 production), keeping S-corp distributions separate from salary, and ensuring that shareholder eligibility requirements are met (no more than 100 shareholders, all shareholders must be U.S. citizens or residents, only one class of stock). Run the specific numbers for your income level with a California CPA before making the election.
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