Estimated 2026

1. Click ‘Get Form’ to open the estimated tax form in the editor.
2. Begin by entering the taxable year at the top of the form. Ensure you specify whether it is for a calendar year or a fiscal year by filling in the appropriate dates.
3. Select the type of entity filing by checking one box: either Form 100, 100W, 100S, or 109. This helps categorize your submission correctly.
4. Fill in your corporation's name, California Secretary of State file number, and FEIN (Federal Employer Identification Number) in their respective fields.
5. For each installment section (1 through 4), enter the due date and estimated tax amount. Make sure to check if any payment is due; if not, do not mail this form.
6. Complete your contact information including telephone number and address. This ensures that all correspondence reaches you promptly.
7. Review all entries for accuracy before saving or exporting your completed form for submission.

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