It would be so cool if there was a little checkbox or something that allowed us to run a backtests where taxes were taken out of capital at the 1st of each year.  As it is now, I have to take the return profile per year and run the numbers on excel or something.  I'm definitely being lazy by asking for this feature, but at the same time I believe its value buliding for the platform and relatively simply to program - albeit complicated in that the team would need to research tax laws in various countries.  But its a project with readiliy available data.