the cpf number is always required, and in case of foreigners their proof of legal residence - registro nacional de estrangeiros - rne,  number is necessary as well.     

additionally, a potential tenant must show paystubs proving that monthly earned income is three times the monthly rent, or bank statements if self-employed, and the imposto de renda das pessoas físicas - irpf, which is the brazilian personal income tax declaration.

in certain cases, these documents may not all be necessary if a potential tenant is renting directly from property owners, or  subletting.