Fpr "identification of account" on the Form, show
TD Ameritrade
or
TD Ameritrade 1099-B
If you have two tax documents reporting the same loss , you would not want to enter that twice.
If you have a different loss on a K-1, then you need to understand which account that is associated with.
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You don't check Box D unless you are doing NOL carryback (this is not common).
@certainly3
