
October 17, 2016, was the last day you can file California State or Federal income tax returns if you were granted the six-month extension in April. It is not the time to panic, but it is definitely time to move quickly if you have not completed your 2015 tax return and payment.
As long as you did so by October 17, you will be allowed to file electronically. However, if you are planning to file an amended return, you must mail it; neither the state nor the IRS allows electronic filing of amended returns.
Keep in mind that any unpaid taxes from 2015 have been accruing penalties and interest since April 18, 2016. You cannot file for another extension; you must file a return.
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