As one may not take both itemized deductions and a standard deduction, taxpayers generally choose the deduction that results in the lesser amount of tax owed.
Brazil is a federal presidential constitutional republic, based on representative democracy. The federal government has three independent branches: executive, legislative, and judicial. Executive power is exercised by the executive branch, headed by the President, advised by a Cabinet.
The Brazilian taxation system is very extensive. Taxes are levied at the state level as well as on district and municipality levels. This leads to numerous different taxes so you might consider consulting a specialist for your initial time in Brazil.