Over 30 years, inequalities in tax income decreased in Île-de-France and in the provinces, but increased between the départements of Île-de-France

In 2018, in mainland France, tax income per inhabitant, that is income before any redistribution, was higher than the national average in most départements of Île-de-France, in five départements including a large agglomeration and in the départements bordering Switzerland.

Between 1984 and 2018, the gap between Île-de-France and the provinces narrowed, but inequalities between the départements of Île-de-France widened significantly. The situation worsened in relation to Seine-Saint-Denis but improved for Paris.

Between départements in the provinces, the disparities were stable overall, although average tax income increased significantly in the départements bordering Switzerland, with the increase in frontier work. It also increased above the national average in Grand Ouest and on the Atlantic coast, whilst the changes were less favourable in the départements of the Paris basin.