Section 38405 Of Article 1. Returns And Payments From California Revenue And Taxation Code >> Division 2. >> Part 18.5. >> Chapter 5. >> Article 1.

. The board for good cause may extend for not to exceed one month the time for making any return or paying any amount required to be paid under this part. The extension may be granted at any time provided a request therefor is filed with the board within or prior to the period for which the extension may be granted. Any person to whom an extension is granted shall pay, in addition to the tax, interest at the adjusted annual rate established pursuant to Section 19521 from the date on which the tax would have been due without the extension until the date of payment.