As part of rebalancing my IRA, I am entering a sale of a portion of a security and am being asked whether to use average cost or to specify the lots. I believe that, for this particular transaction, taxes don't play a part so it doesn't really matter; however, if I understand correctly, my choice may matter in the future if I decide to buy the same security in a taxable account.
At this point, I chose the average cost method but now I am thinking that I perhaps should have chosen to specify lots. I don't think there is a way to undo this choice in the current data file, but I have a backup file so I could easily restore it and do it the other way. I want to make the right choice before moving ahead and I'd appreciate your thoughts on this. If I do specify lots, does it matter which ones I choose? There are three lots and only one is big enough to handle the entire sale. TIA