@serviciores Assuming your company handled things correctly, your company would have included the value of the RSUs in your income when they vested (2016) and you would have had shares withheld or sold for tax withholding; therefore, the cost basis of your company stock is the value that was added to your wages in box 1 of your W-2, less the value of the shares that were sold/withheld. If you don't have that information, but you know the date the RSUs vested, you can look up the stock price on that day (use the low for the day to be safe) and use that as the cost per share. You only need to report the gain/loss from the sales transaction, you don't need to worry about the income, as it was reported in 2016.
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