The deadline for filing California state taxes is generally April 15 of each year, coinciding with the federal tax deadline. However, if April 15 falls on a weekend or a holiday, the deadline may be extended to the next business day. For individuals who require additional time, California offers an automatic six-month extension to file, which allows taxpayers to submit their returns by October 15. It is important to note that this extension is only for filing the return and does not extend the deadline for paying any taxes owed. To avoid potential penalties and interest, it is advisable to pay any estimated tax liability by the original due date. For the most accurate and updated information, individuals can refer to the California Franchise Tax Board website, where they can find specific details regarding deadlines and filing requirements.