The graph below plots Irish income per capita as a percentage of the EU average from about 1955 to 2012, with important dates noted as vertical lines. Notice that Ireland doesn't get above 60-65% until after 1990. In addition, the Commission-enforced increase in the corporate income tax rate from 10% to 12.5%, which took effect in the early 2000s, had no impact on the Celtic Tiger's spectacular rise in income per capita relative to the EU average. This means Ireland had higher growth when the tax rate was 12.5% than when it was 0%!
Q.E.D.
Source: Tax Justice Network, link above
Cross-posted at Angry Bear