My admin is set to show prices without tax. I'm using version 1.3.8

Is there any way to get my invoices to ONLY show the Price (ex) and Total (ex) columns on the invoices and NOT the Tax AND Price (inc) AND Total (inc) columns also?

If not, and someone could at least let me know that it's not possible, that would be very helpful, too, since I've spent the last several days looking for a solution