First post- so be patient.  I prepared a MFJ return- 2 W2's.  The first time I prepared the return and sent to client, they came back and said they did a TT return and received $2,000 more in refund. I went back to my return, the numbers looked right so I stood by my software. Client decides to file with TT. I came back to my software trying to figure out how the refund was off that much. I took one W2 out of the system and reentered the numbers, then the software calculated the overpayment of SS taxes on Schedule 3 - What did I do wrong the first time?