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We have a calendar year end foreign C Corporation doing business in California who maintains the office outside US which we file Form 1120-F and 100W. It is my understanding that for the 2016 Form 1120-F, this return is due June 15, 2017. Lacerte says both Federal and California is due June 15, 2017. It is not clear whether California conforms to this same due date. The instructions for the Form 100W indicates the 15th day of 4th month ending the business year end. Does anyone know? Thanks!