If your W-2 reports all the compensation created by the sale of stock acquired via the ESPP and you know the correct basis number to use for your sales, (discounted out of pocket cost to acquire the stock + compensation created by the sale), then simply enter the 1099-B exactly as it reads, wrong basis and all, and then correct the basis. To do that you click on the "I'll enter additional info on my own" blue button. On the next page enter the correct basis in the "Corrected cost basis" box. The correct basis is (number of shares sold) x (correct per share basis, which includes the compensation per share)
TurboTax will report the sale on Form 8949 "as reported by the broker" but will put an adjustment figure into column (g) of the Form, a code "B" into column (f) of the Form, and the correct amount of gain or loss which includes the adjustment.
Getting the basis properly stated fixes the potential "double income" reporting.
Tom Young
