Suppose I own two shares of company XXXX, one acquired for $3,000 in January 2020, and one acquired for $9,000 in July 2020. In December 2020 I sell one share of XXXX for $6,000. In February 2021 I receive a 1099-B from my broker with the transaction recorded as follows:
1a-Description of property: 1 sh. XXXX
1b-Date acquired: January 2020
1c-Date sold: December 2020
1d-Proceeds: $6,000
1e-Cost basis: $3,000
Realized Gain or (Loss): $3,000
Can I change my cost-basis retroactively to elect to sell the share acquired for $9,000 in July 2020? This would allow me to offset ordinary income with net capital losses of $3,000 (instead of reporting a $3,000 short-term capital gain).
(Note: I understand that I can change my cost-basis election with my broker, but this would only apply to future transactions. The question here is if I can change the cost-basis after I've made the trade.)
