Form 100s 2025

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Mail, using certified mail, to: Franchise Tax Board. PO Box 942857. Sacramento CA 94257-0501.
Similarly to C-corporations, S-corporations and LLCs that have elected to be taxed as an S-corporation must file an annual tax return. All corporations must file a tax return, even if it was inactive or didnt receive income.
Corporations filing Form 100, California Corporation Franchise or Income Tax Return, including combined reports and certain accompanying forms and schedules. Corporations filing Form 100X, Amended Corporation Franchise or Income Tax Return.
100S: Original due date is the 15th day of the 3rd month after the close of the taxable year and extended due date is the 15th day of the 9th month after the close of the taxable year. Note: This does not extend the time for payment of tax; the full amount of tax must be paid by the original due date.
You must file California S Corporation Franchise or Income Tax Return (Form 100S) if the corporation is: Incorporated in California. Doing business in California. Registered to do business in California with the Secretary of State (SOS) Receiving California source income.

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Form 100S is used if a corporation has elected to be a small business corporation (S corporation). All federal S corporations subject to California laws must file Form 100S and pay the greater of the minimum franchise tax or the 1.5% income or franchise tax. The tax rate for financial S corporations is 3.5%.

ca 100s instructions 2023