Just curious if anyone knows the actual rules? This question is in regards to tax loss selling. I was under the impression if you wanted to lock in a loss for 2006, you would have to do it today. It takes three days for the trade to settle right? Other people are telling me that you can sell on the last trading day of the month and still lock in the loss for 2005. Does anyone know the true answer to this? Thank you for any responses.