If you click "Review" it will tell you what you are waiting for, too. Form 8829 is the federal form for claiming home office. You cannot e-file a state return until you have e-filed your federal return. So CA will have to wait until you can file your federal return.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
