C Corporations in California

The C corporation is the entity most small businesses are told to avoid, because of double taxation — the corporation pays tax on its income, and shareholders pay again on dividends. That reasoning is sound for a business distributing most of its profit to a small number of owners.

It is wrong for two situations that matter a great deal: a company that will raise institutional capital, and a company being built toward a sale. Only C corporation stock can qualify for the Section 1202 qualified small business stock exclusion, which OBBBA expanded to $15 million per issuer with tiered holding periods. For a founder heading toward an exit, that can outweigh years of pass-through efficiency.

We advise corporations and founders in Temecula, Murrieta, San Diego, Riverside, and San Bernardino.

The Rates

• Federal: flat 21% corporate rate
• California: 8.84% of net income, or $800 minimum, whichever is greater
• First year: newly incorporated corporations are exempt from the minimum — an advantage LLCs no longer have
• Shareholder level: qualified dividends at 0%, 15%, or 20% federally, plus 3.8% net investment income tax, plus California at ordinary rates to 13.3%

Stacked, distributed profit for a California shareholder can be taxed above 50%. That is the case against the structure, and it is a real one — for a business that distributes its earnings.

Qualified Small Business Stock

Section 1202 is the strongest argument for a C corporation, and OBBBA made it stronger for stock issued after July 4, 2025:

• Tiered exclusions — 50% at three years held, 75% at four years, 100% at five years, replacing the previous five-year cliff
• Per-issuer cap raised from $10 million to $15 million, or ten times basis if greater, inflation-indexed after 2026
• Gross asset ceiling raised from $50 million to $75 million, widening the range of qualifying companies

Core requirements still apply: original issuance from a domestic C corporation, the corporation must satisfy the gross asset test at issuance, and at least 80% of assets must be used in a qualified active trade or business. Service businesses — health, law, accounting, consulting, financial services, performing arts — are excluded, which rules out a substantial share of professional firms.

Stock acquired on or before July 4, 2025 stays under the old rules — five years and a $10 million cap — and generally cannot be converted into the new regime through a reorganization.

California grants no QSBS exclusion. A founder in San Diego who excludes $15 million federally still reports the full gain on the California return at ordinary rates up to 13.3%. Any model showing a tax-free exit is a federal-only model. See capital gains.

When a C Corporation Is the Right Answer

Raising institutional capital. Venture funds require C corporation stock. The S corporation one-class-of-stock rule cannot accommodate preferred shares, and most funds cannot hold pass-through interests without creating unrelated business taxable income for their tax-exempt partners.

Building toward a sale. If QSBS is available and the holding period is achievable, the exclusion frequently dominates the analysis.

Retaining earnings for growth. A pass-through owner is taxed on income whether or not it is distributed. A C corporation retaining profit pays only 21% federally, leaving more capital inside the business. Watch the accumulated earnings tax if retention has no documented business purpose.

Foreign or entity ownership. S corporations cannot have nonresident alien, partnership, or corporate shareholders. C corporations have no such restrictions.

Fringe benefits. Health insurance, group term life, and certain other benefits are deductible and excludable for shareholder-employees in ways not available to more-than-2% S corporation shareholders.

Reducing the Double Tax

Double taxation applies only to distributed profit, and several levers reduce it:

• Reasonable salary — deductible to the corporation, taxed once to the employee. The mirror image of the S corporation problem: here the IRS challenges compensation as excessive and recharacterizes it as a disguised dividend.
• Retention rather than distribution — subject to the accumulated earnings tax where retention lacks business purpose
• Rent and royalties paid to shareholders for property used by the business, at arm’s-length rates
• Retirement plan contributions — deductible and often substantial
• Debt in the capital structure — interest is deductible where the debt is genuine and not recharacterized as equity

Each is legitimate and each has an examination profile. Documentation and arm’s-length terms are what separate planning from a deficiency notice.

California-Specific Issues

No conformity to OBBBA. California’s conformity date is January 1, 2025 under Senate Bill 711. Bonus depreciation is unavailable, Section 179 is capped at $25,000 against $2.5 million federally, and there is no California QSBS exclusion. Each requires a Schedule CA adjustment.

No PTE benefit. The pass-through entity elective tax is unavailable to C corporations. That is a genuine cost of the structure for California owners, and it should be weighed against the QSBS upside.

Apportionment. A corporation operating in multiple states apportions income to California using a single-sales-factor formula with market-based sourcing for services. Businesses selling into California from elsewhere frequently have California filing obligations they have not recognized — an area the FTB examines actively.

California corporate AMT continues at 7%, and California did not conform to the federal corporate alternative minimum tax on adjusted financial statement income.

Converting Between Structures

Conversion is not free and is frequently irreversible in practical terms.

Converting an S corporation to a C corporation is straightforward but triggers a five-year waiting period before re-electing S status without IRS consent. Converting a C corporation to an S corporation triggers built-in gains tax on appreciation existing at conversion if assets are sold within the recognition period, and any accumulated earnings and profits carry over with passive income limitations attached.

Critically, converting an existing LLC or S corporation into a C corporation does not create QSBS retroactively. The holding period and qualification generally run from the issuance of qualifying stock. Founders who intend to rely on Section 1202 should structure early — this is the most common and most expensive sequencing error we see.

Formalities Are Not Optional Paperwork

C corporations carry governance requirements that pass-throughs largely avoid, and they are the first thing examined when someone argues the corporate veil should be pierced or that a payment was really a disguised dividend.

The baseline: annual shareholder and director meetings with minutes, corporate resolutions authorizing significant transactions, a maintained stock ledger, separate bank accounts, and arm’s-length documentation of every transaction between the corporation and its shareholders — loans, leases, salary, and benefits alike.

Shareholder loans deserve particular attention. A transfer recorded as a loan but with no note, no stated interest, no repayment schedule, and no actual repayments is readily recharacterized as a dividend, taxable to the shareholder with no corresponding deduction to the corporation. A written note at an adequate interest rate, with payments actually made, is what distinguishes the two.

For closely held corporations where the same people are shareholders, directors, and officers, these formalities feel artificial. They are also the record that determines outcomes in an examination or a creditor dispute.

Frequently Asked Questions

What is the corporate tax rate?

21% federally, plus California at 8.84% of net income with an $800 minimum. Distributed profit is taxed again at the shareholder level.

Does California give a QSBS exclusion?

No. Gain excluded federally under Section 1202 is fully taxable by California at ordinary rates.

Can my LLC or S corp become a C corp for QSBS?

You can convert, but qualification and holding period generally run from the issuance of qualifying stock — converting does not make prior appreciation eligible. Structure early if an exit is the goal.

Do C corporations get the first-year franchise tax exemption?

Yes. Newly incorporated corporations are exempt from the minimum franchise tax in their first year. LLCs lost that exemption after 2023.

What is the accumulated earnings tax?

A penalty tax on earnings retained beyond the reasonable needs of the business without a documented purpose. Retention for genuine expansion, working capital, or specific plans is defensible.

Which service businesses are excluded from QSBS?

Health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, and brokerage — along with banking, farming, extraction, and hospitality.

Can a C corporation use the California PTE elective tax?

No. It is available only to qualifying pass-through entities.

When is the corporate return due?

Form 1120 is due the 15th day of the fourth month after year end for calendar-year corporations, with a six-month extension available. California Form 100 follows a similar schedule, and the extension covers filing rather than payment.

Can a C corporation deduct charitable contributions?

Yes, generally limited to 10% of taxable income computed before the deduction, with a five-year carryforward for the excess. The limitation catches corporations that make a large one-time gift in a modest income year.

Decide With the Exit in View

The C corporation question is really a question about where the business is going. If profits will be distributed to a few owners, the double tax is a genuine cost with little offset. If capital will be raised or the company sold, the QSBS exclusion and the ability to issue preferred stock frequently outweigh it — provided the structure is in place early enough to matter.

Pietro Canestrelli holds an LL.M. in Taxation and advises on entity structure, QSBS qualification, conversions, apportionment, and corporate tax planning. Schedule a consultation, or review our corporate tax and entity formation services.