By tax rates I mean everything including payroll taxes and taxes you are forced to pay for personal purchases (housing, sales) as well as taxes hidden in daily consumables (gasoline, lottery tickets, etc).
Would it just be easier to find the GDP of a country and their budget and divide them out, would that give the tax rate?
The Organization for Economic Co-Operation and Development has some good statistics to get you started. In calculating the tax burden, one generally divides total tax receipts by either national income, NNP, or GDP.
You can also use the total government budget, at all levels, as the numerator (provided that you subtract out cross-subsidies, as when a federal government remits money to local government, which then spends it again). This is a useful statistic in its own right, but it includes deficit spending and not just taxes.
There’s a handy chart of OECE figures here: http://www.infoplease.com/ipa/A0922307.html