Same question, but do you have to do anything further to notify the IRS who is paying the other half? I.e., even though it was a joint account, only one SSN is associated with the account. So, for 1099-DIV income and 1099-B proceeds do I simply follow the extra step of specifying what portion I owe and that's it, or do I have to fill out some other form saying who is paying the rest?
