A few points so that things are not mixed up:
Taxes are NOT the same as zakat. Taxes go to the ruler, zakat goes to the needy. Zakat is an individual responsibility and voluntary in the sense that no one can force u to pay it but not paying it is a big sin and you will be held accountable for it on the day of judgement. Taxes however are NOT voluntary, they are the result of a man made law (nothing to do with islam) and enforced by the state, you have go to jail if u dont obey the ruler.
Secondly in my opinion, if you live in an 'islamic' state, then you are NOT required to (and must not, to whatever extent possible) obey anti-islamic laws or laws that promote corruption, and tyranny. Taxes are the source of corruption and the bread and butter of the system of tyranny and as such it is the duty of a good muslim to avoid paying taxes as much as possible.
Please read this excellent article as well: http://economicsexposed.com/makas-al-makas-al-makaas/