The firm said the new jobs add to its total headcount of 2,500 staff on the island. Of the 520 new roles, 215 were filled with experienced candidates, with average salaries of €65,000 (£57,457) a year.
It added that 145 of the new roles will be based in Dublin, with the remaining spread across Belfast, Cork, Limerick, Galway and Waterford.
Frank O’Keeffe, EY’s managing partner, said, “While geopolitical, uncertainty and technological disruption will undoubtedly present challenges for businesses and the Irish economies, Ireland is facing these challenges from a position of great strength and flexibility.
“We are bringing together the best talent and latest technology to drive truly transformative innovation in all our services.”
O’Keeffe said that last year, 60% of offers made by the firm in Ireland had been to people with non-traditional tax or accounting backgrounds.
“Tax and accounting experts will always be core to our business, and the combination of traditional and innovative capabilities means we can provide market-leading products and services that help our clients continue to tackle some of today’s most complex and pressing issues,” he added.
The firm said ongoing demand in the firm’s core audit, tax and corporate finance practices have also led to the creation of new roles, such as economic advisory; tax and audit innovation and automation.