tax date
Personal taxes are due April 15th. If the 15th is on a Saturday or Sunday or holiday then the date is moved to the next date. Corporate taxes are typically due on the 15th of March excepting weekends and holidays like personal taxes. Quarterly taxes are due the 15th of each quarter. In 2017 for a CA resident filing personal taxes the deadline is April 18th as the 15th is a Saturday and the 17th is considered a holiday.