As of March 2020, the following list of countries enjoy double taxation treaties with Portugal:

Algeria, Austria, Andorra, Bahrain, Barbados, Belgium, Brazil, Bulgaria, Canada, Cape Verde, Chile, China, Colombia, Croatia, Cuba, Cyprus, Czech Republic, Denmark, East-Timor, Estonia, Ethiopia, Finland, France, Germany Georgia, Greece, Guinea-Bissau, Hong Kong, Hungary, Iceland, India, Indonesia, Ireland, Israel, Italy, Ivory Coast, Japan, Kuwait, Latvia, Lithuania, Luxembourg, Malta, Mexico, Moldova, Montenegro, Morocco, Mozambique, Netherlands, Norway, Oman, Pakistan, Panama, Peru, Poland, Qatar, Romania, Russia, São Tomé and Principe, Sweden, Switzerland, Senegal, Singapore, Slovakia, Slovenia, South Africa, South Korea, Spain, Tunisia, Turkey, the USA, the UK, Ukraine, Uruguay, Venezuela and Vietnam.