S Corporations in California

The S corporation is the most common tax structure for profitable small businesses, and the reason is narrow: it reduces self-employment tax. Everything else about it — the compliance burden, the eligibility restrictions, the exposure to reasonable compensation examinations — is a cost you accept to get that one benefit.

In California the benefit is smaller than the national advice suggests, because the state imposes a 1.5% franchise tax on S corporation net income. Salary is deductible to the corporation, so that 1.5% falls largely on the distribution slice — exactly the income the federal election is designed to shelter. California taxes the dollars you are optimizing.

We advise S corporation owners in Temecula, Murrieta, San Diego, Riverside, and San Bernardino.

How the Tax Savings Work

An S corporation is a pass-through: income flows to shareholders and is taxed once on their personal returns. What distinguishes it from a partnership or sole proprietorship is the treatment of employment tax.

A sole proprietor pays self-employment tax on all net earnings — 15.3% up to the Social Security wage base, 2.9% Medicare above it, and 0.9% additional Medicare over $200,000 single or $250,000 joint.

An S corporation owner-employee pays payroll tax only on W-2 wages. Distributions beyond a reasonable salary are not subject to employment tax at all.

On $180,000 of profit with a defensible $100,000 salary, roughly $80,000 in distributions avoids employment tax — meaningful savings that repeat every year. Against that, subtract California’s 1.5% on net income, payroll processing, a separate corporate return, and the compliance overhead below.

Reasonable Compensation

This is where S corporations are examined, and it is the single most litigated issue in the structure.

The standard is what you would pay an unrelated person to perform the same services — judged on duties and responsibilities, time devoted, the owner’s training and experience, comparable wages in the industry and region, and the relationship between compensation and distributions.

Where owners get into trouble is the ratio. A corporation earning $300,000 that pays its sole working owner $40,000 and distributes $260,000 is an obvious target. The IRS reclassifies the shortfall as wages, assesses employment tax with penalties and interest, and the FTB follows.

Two points about the enforcement environment. The FTB applies the same reasonable-compensation standards as the IRS — there is no separate California test to satisfy, but there is a second agency capable of raising it. And an unpaid payroll tax assessment can become personal: the federal trust fund recovery penalty under IRC 6672 reaches officers and anyone responsible for collecting and paying withheld taxes, and dissolving the corporation does not extinguish it.

The defense is documentation created before the examination — a compensation study, industry survey data, a board resolution setting salary with stated reasoning, and records of hours and duties. Setting salary by what minimizes this year’s tax is how these cases are lost.

Eligibility Requirements

S corporation status is restricted, and violating a requirement can terminate the election:

• No more than 100 shareholders, with family members counted as one
• Shareholders must be individuals, estates, or certain trusts — no partnerships, no corporations, no nonresident aliens
• One class of stock only, though voting and nonvoting shares are permitted
• Must be a domestic corporation and an eligible entity type

The one-class-of-stock rule is the practical constraint. Preferred stock, liquidation preferences, and most convertible instruments break it, which is why venture-backed companies use C corporations. Disproportionate distributions can also be treated as a second class of stock — distributing unequally among shareholders in a year is a real risk, not a technicality.

An inadvertent termination can often be fixed through IRS relief procedures, but it requires prompt action and is not automatic.

Making and Maintaining the Election

Form 2553 must be filed within 2 months and 15 days of the beginning of the tax year the election takes effect — for a new entity, from formation. Missing it pushes the election to the following year, though late election relief is available under Rev. Proc. 2013-30 where there was reasonable cause.

California recognizes the federal election automatically. That convenience misleads people: automatic recognition does not waive the 1.5% franchise tax, the $800 minimum, or the Form 100S filing requirement, due March 15 for calendar-year corporations.

Ongoing California obligations include the $800 minimum in every year including loss years — with a first-year exemption for newly incorporated corporations — estimated franchise tax payments, and an annual Statement of Information.

The California Numbers

• Franchise tax: greater of 1.5% of net income or $800
• Break-even: below about $53,333 of net income the $800 minimum governs
• First year: newly incorporated corporations are exempt from the minimum — an advantage LLCs no longer have
• SDI: 1.3% for 2026 with no wage cap, applying to every dollar of salary

The Pass-Through Entity Elective Tax

California’s PTE elective tax, extended through 2030 by Senate Bill 132, lets the corporation pay 9.3% at the entity level. That payment is deductible federally without regard to the SALT cap, and shareholders take a credit against California tax.

For 2026 and later, missing the June 15 prepayment no longer voids the election, but it reduces the credit by 12.5% of the shortfall. For a profitable S corporation with California shareholders, this is usually worth more than any other single item on the return — and the deadline is unforgiving.

What OBBBA Did Not Give California

Federal law allows a Section 199A deduction of up to 20% of qualified business income for pass-through owners. California has no equivalent. The full K-1 income is taxed at California rates reaching 13.3%.

Similarly, bonus depreciation is unavailable in California, Section 179 is capped at $25,000 against $2.5 million federally, and there is no California QSBS exclusion. Each produces a Schedule CA adjustment, and mismatches between the federal and California returns generate FTB assessments.

Basis, Distributions, and a Trap Worth Knowing

Shareholders can deduct losses only to the extent of basis in stock and in direct loans to the corporation. Losses beyond basis are suspended and carried forward until basis is restored.

Two points cause recurring problems. First, unlike partners, S corporation shareholders do not get basis from entity-level debt — a shareholder guarantee of a bank loan creates no basis. Owners who assume otherwise deduct losses they are not entitled to, and the adjustment arrives with penalties.

Second, distributions in excess of basis are taxable as capital gain. A corporation that distributes more than it earned in a year — funding it from prior accumulations or borrowing — can hand shareholders an unexpected gain even though nothing was sold.

Tracking basis annually, rather than reconstructing it years later during an examination, is the practical answer. Reconstruction after the fact is expensive and frequently incomplete.

Frequently Asked Questions

How much salary do I have to pay myself?

Whatever an unrelated person would earn for the same work, based on duties, hours, experience, and regional industry comparables. There is no safe-harbor percentage, and rules of thumb like a 60/40 split are not a legal standard.

Does California tax S corporations?

Yes — 1.5% of net income with an $800 minimum, in addition to shareholder-level tax on K-1 income. California is one of the few states imposing an entity-level tax on S corporations.

At what profit level does an S election make sense?

Generally once profit exceeds a reasonable salary by roughly $60,000 to $80,000. California’s 1.5% tax raises that threshold compared to most states.

What happens if the IRS says my salary was too low?

Distributions are reclassified as wages, with employment tax, penalties, and interest. The FTB typically follows, and unpaid payroll tax can be assessed personally against responsible persons under IRC 6672.

Can my LLC elect S corporation treatment?

Yes, and it is common. The LLC keeps its formation and governance structure while obtaining S corporation payroll treatment — but the California LLC gross receipts fee still applies on top.

What ends an S election accidentally?

An ineligible shareholder, exceeding 100 shareholders, or creating a second class of stock — including through disproportionate distributions. Inadvertent terminations can sometimes be remedied, but only with prompt action.

Do I still owe the $800 in a year with no income?

Yes, every year after the first, including loss years. The exception is the first-year exemption for newly incorporated corporations.

Can an S corporation have a single owner?

Yes. A single-shareholder S corporation is common and works the same way — the owner takes a reasonable W-2 salary and may receive distributions beyond it. The reasonable compensation analysis is if anything more important, because there is no other shareholder whose interests constrain the salary decision.

What is the deadline to file Form 100S?

March 15 for calendar-year corporations, with an extension available to October 15. The extension covers filing only — the franchise tax payment is still due in March, and interest runs on anything paid later.

Run the Numbers on Both Returns

An S election that looks obviously worthwhile on a federal projection can be marginal once California’s 1.5% franchise tax, no-cap SDI, and the absence of a QBI deduction are included. It can also be clearly right — but that should be a conclusion, not an assumption.

Pietro Canestrelli holds an LL.M. in Taxation and advises on elections, reasonable compensation documentation, PTE planning, and IRS and FTB examination defense. Schedule a consultation, or review our entity formation and business tax audit services.