The form 1099-B should show a sale amount and cost basis. Often, the cost basis is listed as -0- if the issuer of the form 1099-B does not have an accurate figure for that amount. The gain or loss is the difference between the sale amount and the cost basis.
If the form shows a loss but no cost basis, then the sale amount would have to be a negative figure. I don't think I have ever seen a negative sale amount listed, so I'm curious as to how the form 1099-B shows a loss?
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