California Franchise Tax Board (FTB) - Online Payment Instructions

California Franchise Tax Board (FTB) - Online Payment Instructions - Extension Payments for Corporations

Go to Pay | FTB.ca.gov
Under "Make a Payment", choose "Bank Account". This is not for credit card payment.
Under the business column, click on "Use Web Pay Business".
Enter "Corporation" for entity type.
Enter entity ID. This is not the same as EIN. This is a 7-digit ID number.
1. If you don't know your corporation's entity ID, go to Search | California Secretary of State
2. On the search bar, enter your company's name.
3. Find your company name from the result list. The entity ID is found below your company name.
Enter your name.
For tax form, select "Form 100, 100S, 100W, or 100X".
For payment type, select "Extension Payment (Form 3539)".
Period beginning date is January 1, XXXX, unless you have a calendar year period. The year is the year to which you want the payment to apply. Be careful.
Period ending date is December 31, XXXX, unless you have a calendar year period. The year is the year to which you want the payment to apply. Be careful.
Enter the payment amount and the payment date.
Everything else should be self-explanatory.