Ronan Costello
About Ronan
Ronan Costello is a Partner in EY Ireland’s Financial Services Tax practice, specialising in aviation finance and international tax. He has over 14 years’ experience advising international and domestic businesses on Irish and cross-border tax matters, with a particular focus on aircraft lessors, private equity and private credit investors, and multinational groups.
Ronan has extensive experience advising on aircraft leasing structures, portfolio acquisitions and disposals, debt and equity financings, asset-backed securitisations and corporate restructurings. He works across the aviation and broader financial services sectors, collaborating with legal advisers, investors, finance teams and other stakeholders on complex transactions and business initiatives.
He also advises multinational groups on international tax developments, including the implementation of OECD Pillar Two rules and the impact of wider global tax reform. His approach combines technical tax expertise with practical, commercially focused advice tailored to the needs of complex financial services businesses.
Ronan is a member of Chartered Accountants Ireland’s Tax Policy and Administration Committee and represents industry on a number of Tax Administration Liaison Committee (TALC) working groups. Through these roles, he engages with Revenue, policymakers and industry stakeholders on the practical application and administration of Irish tax legislation.
Ronan is a Chartered Accountant and Chartered Tax Adviser. He holds a BA in Economics from University College Dublin and a Diploma in Accounting from Dublin Institute of Technology. He has a particular interest in the continued development of Ireland’s aviation finance sector and the evolving international tax landscape.
