According to Executive Digest, the analysis, cited by Jornal de Negócios, reveals that the municipalities that concentrate the richest are Lisbon, Oeiras, Cascais, Sintra, Porto, Vila Nova de Gaia, Matosinhos and Loulé.

The study in question, the 'Dashboard of Income Inequalities and IRS', looks at the levels of income inequalities declared and included in the IRS, based on administrative and anonymized microdata from the 2021 IRS settlement notes, delivered in 2022.

The top 0.1% corresponds to families with the highest gross income in the country, while the remaining 99.9% of the population earns less, and the analysis does not include wealth held in assets.

It is in the range of the richest that, in 2021, an average gross income of 429.6 thousand euros (something like 30.6 thousand euros per month) was declared.

The value is higher than that recorded in the previous year (2020) when the richest had an average income of 399.9 thousand euros (18.6 thousand euros per month).

The richest households have incomes above 228.4 thousand euros per year but pay an effective IRS rate of close to 42.36%, below the defined rates.

The document also reveals that the poorest families declare income in the Algarve, the Interior and Madeira.

There are five municipalities (three of which are in the Algarve) that concentrate a greater percentage of the population with a lower income. This is the case of Lagos, which has 20.75% of the municipality's population within the group of 10% poorest families in the country, as well as Tavira, Valpaços, and Calheta.