Hi All, Possibly a stupid question (I know, the only stupid questions are the ones you don't ask, blah blah.. ), but I'm trying to understand how capital gains are measured when selling shares. Say I buy $1000 worth of share X. Some time later the values of the shares double, so my holding is now worth $2000. If I decide to sell half my holding, ie, $1000, do I need to pay capital gains tax. I guess what I'm trting to understand is whether the capital gains are measured on a "per share" basis (I have effectively made a $500 gain in this case), or is it based on the whole lot. Thanks. John.