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After you file
See https://www.irs.gov/instructions/i3115
If this constitutes an actual change in accounting method (which I am not sure it does), you would have to file Form 3115, which typically requires professional intervention.
Otherwise, I believe you would have needed to provide your broker with instructions at the time of the transactions (and, if not, you cannot alter it at this point).
‎December 17, 2022
7:44 AM