You can do that but if an IRS audit occurred, this could be construed as tax fraud because you are zeroing out all potential capital gains. First of all, you need to determine if these are long term or short term capital gains, which will be listed under the sales category. If it indicates long-term, you can enter a date that is more than one year from the sales date. This makes it harder to determine a cost basis in this case but the capital gains are less. If it indicates it is short -term, you can enter a date that is within a year of your sales date. This also makes it easier to find out what the cost basis is because you can research historical stock prices within that year and take an average of that amount and enter as a cost basis. As i said, it is harder to do this if these are long-term transactions.
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