I understand that I can set the cost basis method in my brokerage account for stock sales going forward.
My question though was for the sale in 2021 that is already reported in 1099 to IRS. It has a cost basis calculated based on FIFO method as that was the setting in my brokerage account. Now for 2021 tax computation that I am doing, can I use a different cost basis (same stock bought in the same brokerage account at a higher price on a different date) than the one reported to IRS in 1099 ?
