If you don't enter the cost of the investments when you sell them, you will pay tax on the full sale proceeds. It is not necessary for the cost to be stated on the Form 1099-B reporting the sale for you to be able to enter it, however. You will simply need to do some research to determine what the cost of the shares was and you can enter that cost when you report the sale on your tax return. You should keep documentation supporting your calculations in case the IRS should request it.
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