Ireland has been labelled as a corporate tax haven in multiple financial reports, an allegation which the state has rejected in response. Ireland is on all academic tax haven lists, including the § Leaders in tax haven research, and tax NGOs. Ireland does not meet the 1998 OECD definition of a tax haven, but no OECD member, including Switzerland, ever met this definition; only Trinidad & Tobago met it in 2017. Similarly, no EU–28 country is amongst the 64 listed in the 2017 EU tax haven blacklist and greylist. In September 2016, Brazil became the first G20 country to "blacklist" Ireland as a tax haven.
Ireland's base erosion and profit shifting (BEPS) tools give some foreign corporates § Effective tax rates of 0% to 2.5% on global profits re-routed to Ireland via their tax treaty network. Ireland's aggregate § Effective tax rates for foreign corporates is 2.2–4.5%. Ireland's BEPS tools are the world's largest BEPS flows, exceed the entire Caribbean system, and artificially inflate the US–EU trade deficit. Ireland's tax-free QIAIF & L–QIAIF regimes, and Section 110 SPVs, enable foreign investors to avoid Irish taxes on Irish assets, and can be combined with Irish BEPS tools to create confidential routes out of the Irish corporate tax system. As these structures are OECD–whitelisted, Ireland's laws and regulations allow the use of data protection and data privacy provisions, and opt-outs from filing of public accounts, to obscure their effects. There is arguable evidence that Ireland acts as a § Captured state, fostering tax strategies.