Since pay per return is done by SSN, once you change the SSN it looks like you're trying to file a return for another person and it wants to charge you again....otherwise people would just keep changing the SSN and info and file a bunch of returns for different people for that same 1 fee.

If you finger flubbed the SSN originally and had to change it, Im sure if you call in Intuit will give you a one time pass and give you an authorization code to bypass payment this time...I wouldnt make a habit of it though...be diligent in your SSN entries, double and triple check if needed prior to authorizing payment for the return.