Sofi number, is necessary to work legally in the Netherlands. You can apply for a Sofi number at Dutch governmental institutions and you can authorize Larex in writing to arrange a Sofi number for you. It will take about 10 days to receive a Sofi number, and during the holiday this could take even more time. During this time you are allowed to work in Holland but you cannot receive total compensation (only a deposit). The rest of your earnings will be paid when the Sofi number is active.