The border and midlands regions had the lowest levels of disposable incomes pre-pandemic.
Figures from the CSO for 2019 reveal that after tax incomes in the midlands were the lowest nationwide at €17,125.
That's almost €5,000 less than the national average of €22,032.
The border region came next, with an average net income of €18,524.
Meanwhile, workers in Dublin have the highest disposable incomes, at just under €25,700.
The Northern & Western Regional Assembly says underinvestment in key infrastructure assets of the Northern and Western Region is likely to have contributed to rising regional inequalities.
John Daly is an economist with the group, he spoke to Aaron McElroy to explain the reasoning behind these figures.