Did you use the ESPP guided interview? Properly done that interview should calculate the compensation on sales of this stock. If you noticed that TT was creating a "compensation" element as part of the basis for the sales then I'd tell you to go back into the "Stocks, Mutual Funds, Bonds, Other" interview and complete the interview. If you stopped this interview when you simply entered your last sale, then you didn't go to the bitter end. At the very last page of the interview the program should present to you the total amount of compensation it's calculated and ask you if that's the amount on your W-2. If you answer "No" here TurboTax will make the proper adjustment.
