Retirement tax questions

I know this is an older thread, but I'm going through a similar situation now after selling my BA stock in October 2024 that I received from the Boeing ShareValue Trust distribution in 2008.  For Linda's situation she should have used the average of the high and low values for BA stock on June 30, 2006 to calculate her Cost Basis, which in this case (assuming she received the full payout of 42 shares) would be the average of $83.00 and $81.57, namely $82.29.  Selling all 42 shares we received would yield a Cost Basis of $82.29 x 42 or $3,455.97 (which was the Cost Basis I used when I sold my 42 shares in January 2007).  I still have a digital copy of my 2006 Boeing W2 and it shows a Share Value Program payout of $5,231.56 for 2006.  The stock we received was given as part of that payout, so taxes were indeed paid back in 2006.  Linda should file an ammended return if she did ultimately use a $0.00 Cost Basis.  Hope this helps her and any others.  I found this thread via a Google search to investigate how I should handle selling my shares in 2024.