I can't find a way to file a California extension

California automatically grants a 6-month extension to October 15, 2018. You do not need to fill out an extension form.

However, if you owe additional California taxes, you'll need to submit payment by April 17, 2018 to avoid penalties. The California Franchise Tax Board offers these options:

• Print and mail California Form FTB 3519 along with your check payment; or
• Submit your payment online at the California Franchise Tax Board's Web Pay site; or
• Pay by credit card.