Ok, I have an RDP situation. For federal purposes, one partner is done and filed. The other partner had a big mess with COD income that had to be extensively researched and so at this point he is on extension. Getting refunds. The CA return will be filed joint, and CA offers an automatic extension if the federal one is granted. So....does the 4868 filed for partner 2 cover partner 1 since a joint return will be filed in CA?