"challenger Firm to the Big 4" EYtax was founded in 2020 and headquarters is located in Dublin Ireland & London UK. EYtax mis ... sion is to be the largest professional services firms in the world by 2035 as well stand as one of the big four professional services firms by 2030. EYtax provides services such as Audit, Tax, Consulting, Financial advisory, Emerging technologies, Corporate Finance, Restructuring & Corporate Insolvency, Legal Advisory. Our mission is to help our clients prosper by providing them with a wide array of professional business and individual services, products, and solutions to help them better manage their finances and employees. We endeavor to provide superior client service and build long-term client relationships. read more