Brazilians have two options. You can keep an active fiscal status or an inactive one. If you opt for the former you have to pay taxes of any amount you are paid, and this is calculated based on income brackets. Based on the income mentioned for this contract, it would fall under the 27.5% bracket.
On the other hand, you can also choose to inform the IRS that you are leaving the country for good (for at least one year, 12 consecutive months) and therefore you are exempted of declaring income/properties and paying taxes.