Did you know that you can have tax refund just by giving your NIF while doing groceries ? Indeed in Portugal, every year you have to confirm all expenses you have done . You have communicated your Numéro de Contribuente for each purchase made or service ordered, so you have made halfway to claim a tax refund. In Portugal giving your NIF is not the only thing that you have to do. It is necessary to register receipts on the website of Finanças and to give sort them by category. Why should you give your NIF when you buy stuff ? How to register your bills in Portugal on the website of Finanças ? Which information to communicate ? How to optimize your invoices registration to receive an even greater tax refund ? Lisbob, expats assistant in Portugal, tells you everything.