I have argued many times (most directly here) that, contrary to the claims of nearly all Irish policymakers, low taxes are not what makes the Irish economy tick. The country experienced 30 years of low taxes with no gain on average European income; it was only after 1987 that other policy changes (education, EU-funded infrastructure, and Social Partnership) led to gains on the EU average. Thanks to a Tax Justice Network blog post, I now have a great illustration to show this in living color.
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%!
Source: Tax Justice Network, link above
Cross-posted at Angry Bear