Reason being it gets too complicated to account for it, as the...

Reason being it gets too complicated to account for it, as the tax rate changes according to stored tax credits. I like to make a comparison on earnings before tax, as you don't have to worry about this. The other thing is the tax that they pay gets added onto my profit/loss statement I lodge to the tax man, who taxes me at my peronal rate not company rate. Hence I find it simpler to work without tax, and pay it when I make the profit.