People were evading tax, businesses were illegally employing people and there were benefit cheats, Mr Brown told BBC Radio 4's Today programme.

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This insecurity - not knowing whether his job is safe - means he is considering evading tax for the first time in his life.

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Chas Roy-Chowdhury, head of taxation at the ACCA accountancy body, said that it was still a small number of people who were evading tax in these markets.

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The Germans worry that some of their citizens are holding Eurobonds overseas, evading tax, and that this problem will get worse once the euro is introduced.

ECONOMIST: Europe

That commitment to secrecy has been a thorn in the side of many countries, including fellow Europeans like Germany and the UK, who have been constantly thwarted in their attempts to identify those who were evading tax by opening accounts in Swiss banks.

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Tax shelters are defined to include any plan or arrangement having a significant purpose of avoiding or evading federal income tax.

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In the old days lawyers and accountants were the ones who curbed their clients' tax-evading urges.

FORBES: U.S. tax rackets

The treatment of this provision is different, as I said before, because the law was written in the '80s to prevent two private sector corporations and companies from being used for tax-evading purposes, okay?

WHITEHOUSE: Press Briefing