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California S corporation taxes and Form 100S records
An S corporation’s California filing starts with its business activity and accounting records. Keep entity tax payments, shareholder activity and payroll identifiable for the CPA preparing the return.
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General information, not legal or tax advice.
Determine why the corporation has a California filing
FTB requires Form 100S when a corporation is incorporated in California, does business here, is registered with the Secretary of State to do business here, or receives California-source income. Gather formation records and the locations of activity for your CPA. Do not decide filing obligations from the mailing address alone.
Sources: California Franchise Tax Board, S corporations (last updated 05/28/2026)
Distinguish the income rate from the minimum tax
FTB states a 1.5% rate for S corporations with California-source income and an annual $800 minimum franchise tax. The minimum is due in the first quarter of each accounting period and applies to active or inactive corporations, loss years and short-period returns, subject to the stated exceptions. Maintain a separate record of payments and notices.
Sources: California Franchise Tax Board, S corporations (last updated 05/28/2026)
Document the initial-return exception carefully
Newly formed or qualified S corporations filing their initial return receive a first-taxable-year minimum-tax waiver, but first-year net income remains subject to the 1.5% rate. FTB also describes a waiver when no California business was conducted and the taxable year was 15 days or fewer. Ask your CPA which exception, if any, applies to the entity’s facts.
Sources: California Franchise Tax Board, S corporations (last updated 05/28/2026)
Prepare the close before the return deadline
The stated Form 100S due date is the 15th day of the third month after the taxable year closes. Corporations with income both inside and outside California use Schedule R for apportionment. Supply reconciled reports, location details and supporting schedules early enough for the CPA to investigate open balances.
Sources: California Franchise Tax Board, S corporations (last updated 05/28/2026)
Separate officer payroll from shareholder distributions
IRS guidance says a corporate officer is generally an employee. Keep officer compensation, shareholder distributions and entity tax payments distinguishable in the ledger. Resolve compensation questions with your CPA and coordinate the approved treatment with payroll. The related reasonable-compensation and PTE guides explain records that may belong in the same year-end file.
Sources: IRS Paying yourself
Sources: determine why the corporation has a California filing
Owner wages and the entity election
Prepare an S corporation bookkeeping package for your CPA
Tidwell reconciles accounts and organizes payroll and shareholder records so your CPA can handle the return and tax decisions.