Data from the local authority, to which Lusa had access, indicate that tourism tax revenue in Oporto for the year 2020 was "5,465,431 Euros", a fall of 9.5 million Euros (63.3 percent) compared with tourism tax revenue of "14,893,786" in 2019.

The fee charged to visitors who stay overnight in Porto came into force on 1 March 2018, with a value of two Euros per overnight stay, applied to guests over 13 years of age, for a maximum of seven consecutive nights.

In 2018, the municipality of Porto collected 10.4 million Euros and counted 5.2 million overnight stays.

The Porto Municipal Tourist Tax was created with the aim of minimising the difficulties presented by the significant growth in tourism.

According to the official website of the Porto City Hall, it serves as "a means of financing the improvement of a number of activities and investments promoted by the City Hall related to tourism, namely, the environmental preservation of the city, traditional, historical and local commerce, public and private municipal improvement works and cultural and recreational dynamisations, spread throughout the city.