Learn who files California Form 100S, how the 1.5% S corporation tax and $800 minimum work, and how income passes to shareholders.
California Form 100S, S Corporation Franchise or Income Tax Return, is the state return for a corporation or eligible LLC taxed as an S corporation and subject to California law. It calculates entity-level California tax and reports income, deductions, credits, shareholder allocations, and other state adjustments.
A federal S corporation subject to California franchise or income tax generally files Form 100S. This includes a corporation formed in California, registered or qualified to do business in California, doing business in the state, or deriving California-source income under applicable rules.
An LLC can also file Form 100S when it elected corporate classification and made a valid S election. The legal "LLC" label does not force Form 568 when the tax classification is S corporation.
Form 100S is different from Form 100, which generally applies to C corporations, and Form 568, which generally applies to LLCs taxed as partnerships or disregarded entities.
The S corporation computes California taxable income for two related purposes. First, it determines the corporation's own franchise or income tax. Second, it calculates items passed through to shareholders on Schedule K-1 (100S).
Shareholders report their shares even when the corporation does not distribute cash. A distribution is not the same as pass-through income, and shareholder stock and debt basis can affect whether losses or distributions receive the expected treatment.
California generally taxes an S corporation at 1.5% of its California net income. Financial S corporations generally use a 3.5% rate. Certain built-in gains and excess net passive income can be taxed at 8.84% under separate rules.
The ordinary 1.5% tax is not shareholder withholding and does not replace the shareholders' personal tax. It is an entity-level cost of operating under California's S-corporation regime.
An S corporation doing business in California generally pays the greater of its measured tax or the $800 minimum franchise tax. The minimum can apply when the business is inactive, has a loss, or has a short year.
California generally waives the minimum franchise tax for a newly incorporated or newly qualified corporation's first taxable year, but the corporation still computes tax at the applicable percentage. The waiver has limits and does not automatically apply to every newly classified entity or qualified S subsidiary.
Assume Pacific Books, Inc. has $120,000 of California net income. Its ordinary S-corporation tax is $1,800: $120,000 × 1.5%. Because $1,800 exceeds $800, the corporation pays $1,800 before credits and other adjustments.
If its California net income were $20,000, 1.5% would be $300. An established corporation subject to the minimum would generally pay $800 instead. The shareholders separately report the pass-through income allocated on Schedule K-1 (100S).
Each shareholder generally receives Schedule K-1 (100S), which reports the shareholder's California share of ordinary business income and separately stated items. Residency and apportionment can affect how much is California-source income.
The state K-1 should be reconciled with federal Schedule K-1 (Form 1120-S), the corporate books, shareholder ownership percentages, payroll, distributions, loans, and basis records. Differences may be legitimate because California does not conform to every federal rule.
Form 100S is generally due on the 15th day of the third month after the close of the taxable year. A calendar-year S corporation normally files by March 15, adjusted for weekends and holidays. California can allow an automatic filing extension, but payment is still due by the original deadline.
The minimum franchise tax is generally due during the first quarter of the accounting period, and estimated-tax requirements can apply. A valid extension should never be treated as permission to delay every payment.
Federal Form 1120-S and California Form 100S use related information, but California adjustments can arise from depreciation, bonus depreciation, Section 179, tax-exempt income, credits, apportionment, and other nonconformity. State accumulated adjustment and basis information should not be assumed to match federal records.
California also requires reasonable shareholder-employee wages under the underlying compensation rules. Calling payments "distributions" does not eliminate payroll responsibilities when the shareholder performs services.
An eligible S corporation can elect California's pass-through entity elective tax for consenting qualified shareholders. The 9.3% elective tax is separate from the regular 1.5% S-corporation tax. The entity reports the election and qualified net income using FTB 3804, pays through the prescribed PTE process, and provides information shareholders need for FTB 3804-CR to claim the PTE Tax Credit.
The election should be modeled owner by owner. A state credit, federal entity-level deduction, cash payment, and shareholder distribution are different accounting and tax events.
Gather the federal Form 1120-S, prior Form 100S, books, bank and payroll records, shareholder roster, stock and debt basis schedules, officer compensation, distributions, loans, fixed-asset schedules, California apportionment data, estimated-tax confirmations, and PTE election records.
Heath Income Tax prepares coordinated federal and California S-corporation returns and helps owners reconcile payroll, distributions, basis, K-1 reporting, and PTE elections. Contact our Santa Maria office for assistance.
Does every S corporation pay $800?
Most S corporations doing business in California pay at least $800, but first-year and narrow statutory exceptions can apply.
Is the California S-corporation rate 1.5% or 9.3%?
The regular entity rate is generally 1.5%. The 9.3% rate applies to a separate elective PTE tax calculation for qualifying owners.
Does an LLC with an S election file Form 100S?
Generally yes when the election and classification are valid and the entity is subject to California filing.
Do shareholders report income without receiving cash?
Yes. Pass-through income and cash distributions are separate.
The definitions and examples on this page are for informational purposes only and do not constitute tax advice. Tax laws change frequently and individual circumstances vary. Consult a qualified tax professional before making decisions based on this content.
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