You should enter the cost of the securities as cost basis. However, you do this as an adjustment entry to the cost basis. If the form 1099-B does not list a cost basis, you enter it as -0-. However, you then click on the "I'll enter additional information on my own" and enter the cost basis on the next screen. That way, the IRS will see the form 1099-B entries as they are reported to you, but then with an adjustment to bring the reported basis in line with the actual basis.
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