I need help because I am so confused on how to report non-statutory stock options on my client's tax return. I have entered the information from the 1099-B and it brought the taxpayer refund to owing.

My client sold company stock, his W-2 shows Code V in box 12 for $9,429. I understand the W-2. His 1099-B from the brokerage firm who handled the sale and the proceed ($10,665) minus cost basis ($6,619) shows gain of $4,046.

So I included the 1099-B info on his taxes, but it seems like this is reporting the gain twice and it goes from refund to owing.

What am I doing wrong? Or, have I entered the information correctly, and the client does owe?