Determining the cost basis of stock
I had 5900 shares of stock purchased over an eight year period
Last November I sold shares of 426 shares of xyz corp. @194
The shares had been purchase at various dates in 2017 & 2018 and 2022 at various prices ($168, $174 & $194).
The consolidated tax statement I was sent by my brokerage account shows
$82438 for box 1d proceeds
$20425 for box 1e cost basis
How do brokerage firms determine the cost basis of these shares when the shares I originally were purchased at different times over the years?