I am having difficulty in figuring out how to enter the correct basis for my stock sale. I left my company in 2014 and exercised all remaining options. They were sold in two transactions on the same day, income tax was withheld and reported on my W2. I received a 1099-B form showing the details of the sale but the form does not list in box 4 the income tax that was taken. Since I have already been taxed on this, I'm trying to figure out how to enter the information correctly to avoid the double taxation. From what I can garner so far I think I think I have to change the cost basis (which would be different than what is reported in the 1099) and show a small loss that would reflect the commissions paid. For example, my 1099 shows the proceeds as $33,387 (basis is $26,921). My year end statement shows the tax withheld as $1,551 which is not on the 1099. The individual transaction documents also show the federal tax along with the FICA etc. I am using H&R Block software and it does not really help with figuring this out. Any help will be appreciated