Dealing with the California Franchise Tax Board for a single member LLC ever afterwards is a pain. You need to file a 568 with them every year, on paper even if you e-file your CA state taxes, which includes the same data. You need to pay them $800 every year through their terrible website and its Web Pay system. Just getting an account on their website involves them sending you a magic access code in a letter which takes a week and if it doesn't work you have to start again and wait another week. If you ever forget to file something on time they fine you and charge you interest, and threaten to suspend your LLC. I wish I'd just filed a "doing business as".