If you report properly, you won't be double taxed. You have to report the sale, but you don't pay tax on the proceeds. When you receive a stock award (e.g. Resricted Stock, or RSUs), tax is assessed on the value of the stock on the day the stock vests/ is delivered. That amount is ordinary income, and is included in Wages on Box 1 of your W-2 for that year. Your cost basis is also the value of the stock on the day it vests or is delivered. The problem is, brokers don't have (or don't report) that information. If you know the amount that was added to your income, that is your actual cost basis. In order to keep from paying tax on the stock award twice, you have to correct your cost basis. To do so, go to that 1099-B transaction, and on the page with the Description, Date Acquired, Date of Sale, Sales Price, and Adjusted Cost or Other Basis, click on "I'll enter additional info on my own". On the next page, enter the "Corrected cost basis"
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