Actually, this formula has some problems :S
Profit in Virtonomics is based on cash flow profit (payments and receivables). Taxes are based on economic profit (that's why they are based on revenue - prime cost instead of revenue - expenses).
So, for example, if you are increasing your stock, you will increase your tax rate (because profit lowers) which is not actually true.
If I wanted to use a formula like this I would do Taxes / Asset growth. Asset growth is the difference in asset value between this and last turn. However, the asset value algorithm has it's problems but still is the easy-to-use KPI that I thrust most as "profit"
BUT, if you want to calculate your actual effective rate, it will take a bit of work but do it like this:
SUM (Taxes per office) / SUM (Taxes/Country tax rate per office) |