Taxes

Respected scholars, As-salamu `alaykum. As a Canadian Muslim I pay taxes to the government, which takes up a major portion of my income. It is my understanding that a portion of the taxes thus collected by the government goes to the poor and those who work to collect them. This being the case, can I consider myself as being absolved from the duty of paying zakah? Jazakum Allahu khayran.

Respected scholars, as-salamu`alaykum. Are customs and taxes forms of injustice and thus, working as a tax collector would help to impose injustice? Is it allowable that a Muslim may evade paying them? Are they really important for the financial system of the state?Jazakum Allahu Khayran.