Advanced Automatic Investor

[AIMster]

Depending upon one's notion of accounting, the proceeds could be used to lower the "average cost" but from a tax accounting point of view selling does nothing to change the previous average cost. My guess is that Mark has chosen to use the "tax accounting" model in this regard.

Thanks, Tom,

Makes sense from that perspective. I was looking at it more from the absolute sense of if I had 100 shares, sold 10, the cost would be changed by dividing the 90 into the remainder of the sum of the cost(s) to get a per share value that way. If one were to derive such a model you would have to somehow or other tell AI from which tax lot, so to speak, the sale was made from, something that it doesn't do now. Models being FIFO, LIFO, greatest gain, greatest loss, at least as far as my ancient MYM software allows for. All depends on how you want to slice-and-dice. I suppose he could add a field for "tax basis cost" and another for "average cost," but maybe I'm building version 4.x at this point, eh? <grin>.

Best,

AIMster