The issue is now creeping up the European political agenda with EU leaders staging a summit tomorrow largely focused on trying to convince Luxembourg and Austria to share bank records openly with European Union partners.
Luxembourg today said it would begin sharing account information on a more automatic basis with the United States from 2015, following negotiations with Washington.
"The US is a big stick in this area," a senior EU diplomat said today, highlighting a "30 per cent hit" for foreign financial institutions that do not fall into line with a 2010 United States law, the Foreign Account Tax Compliance Act (FATCA).
"Tax harmonisation is not the name of the game," said a top EU official closely involved in preparing the one-day summit otherwise concerned with energy policy.
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While Britain has put the corporate tax aspect of international avoidance on the agenda for upcoming Group of Eight talks, Ireland's fierce resistance to moves on its corporate-friendly national tax policy -- fully protected under EU treaties -- means the political will ahead of the summit is "not as advanced".
These "abuses" need clamped down on "urgently", said Commission spokesman Michael Jennings.
The US Senate committee said special arrangements negotiated between Dublin and Apple meant a corporation tax take of less than two percent, but Irish Deputy Prime Minister Eamon Gilmore argues the loopholes enabling such rates are widespread in other jurisdictions.
Irish Finance Minister Michael Noonan insisted last week that Dublin operates a fully transparent tax system, arguing that a standard-rate corporation tax of 12.5 per cent should not be compared like-for-like with other countries given differences in labour and other types of taxation.