You don't seem to understand what a tax haven is. It's not that domestic people don't pay taxes, or that there is no income tax, or payroll tax.
It's that corporate profits can be artificially shifted there and are then not or barely taxed.
Just read the wikipedia article please:
> Ireland ranks in all non-political "tax haven lists" going back to the first lists in 1994,[n][30] and features in all "proxy tests" for tax havens and "quantitative measures" of tax havens. The level of base erosion and profit shifting (BEPS) by U.S. multinationals in Ireland is so large,[4] that in 2017 the Central Bank of Ireland abandoned GDP/GNP as a statistic to replace it with Modified gross national income (GNI*).[104][105] Economists note that Ireland's distorted GDP is now distorting the EU's aggregate GDP,[106] and has artificially inflated the trade-deficit between the EU and the US.
It's that corporate profits can be artificially shifted there and are then not or barely taxed.
Just read the wikipedia article please:
> Ireland ranks in all non-political "tax haven lists" going back to the first lists in 1994,[n][30] and features in all "proxy tests" for tax havens and "quantitative measures" of tax havens. The level of base erosion and profit shifting (BEPS) by U.S. multinationals in Ireland is so large,[4] that in 2017 the Central Bank of Ireland abandoned GDP/GNP as a statistic to replace it with Modified gross national income (GNI*).[104][105] Economists note that Ireland's distorted GDP is now distorting the EU's aggregate GDP,[106] and has artificially inflated the trade-deficit between the EU and the US.
https://en.wikipedia.org/wiki/Ireland_as_a_tax_haven