J'ai reçu ça d'iTunes Connect :
In January, the pricing for apps and in-app purchases on the App Store in Brazil changed from U.S. dollars to Brazilian reais. Since your country/region of residence has a tax treaty agreement with Brazil, you have the option of providing a tax residence certificate to be eligible for a discounted withholding tax rate. Without this certificate, your sales in Brazil will be subject to the withholding tax at the general rate.
If you plan to submit the certificate, please upload it in iTunes Connect by March 30, 2018. Apple will verify your documentation and if it is approved you’ll receive the discounted rate. Certificates received after this date will be subject to the withholding tax at the general rate until they are processed by Apple. If approved, the discounted rate will be applied to future payments.
En creusant un peu j'ai vu qu'on pouvait trouver un formulaire de Certificat de Residence Fiscal.
Quelqu'un a-t-il déjà réalisé la procédure ? Je suppose qu'il faut remplir ce papier et l'uploader sur iTunes Connect...