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All of us have the right to keep our money in a bank anywhere from the Isle of Man to the Maldives. But failure to disclose interest received and pay tax due is evasion - and that's illegal.
This week HM Revenue and Customs launched an amnesty - officially the "offshore disclosure facility". Instead of penalties of up to 100% of the tax owed, anyone making a full disclosure by June 22 will pay just 10%. And if the tax owed is less than £2,500, it will waive penalties, although all taxpayers using this "facility" will have to pay interest due on back tax.
One estimate suggests £200bn is hidden away in offshore banks, gaining at least £8bn a year in interest and a potential £3bn a year tax evasion loss. An amnesty in Ireland five years ago brought in £580m in unpaid taxes.
Offshore tax cheats once relied on account details being protected by confidentiality. But a two-pronged attack has uncovered huge amounts of information on tax dodgers.
In 2002, the then Inland Revenue set up the Offshore Fraud Project Group on Merseyside, conveniently close to the Isle of Man - seen as the tax haven of choice for UK evaders with less genuine international business than tax-free Jersey and Guernsey.
But the real breakthrough came with the EU savings directive in July 2005.....continued below
In April 2006, however, the Revenue forced Barclays to disclose details of customers using UK legislation.
The other big banks - Halifax Bank of Scotland, HSBC, Lloyds TSB and NatWest/Royal Bank of Scotland - were also hit by disclosure orders after they failed to disgorge information voluntarily. Smaller banks and building societies have now fallen into line.
But this is not a general tax cheat amnesty. Chris Oates at accountants Ernst & Young warns: "While this emphasises HMRC's active approach in tackling offshore tax evasion, crucially, there is no immunity from prosecution. Therefore any disclosure can probably be used in evidence. Undoubtedly, the incentive to disclose is the fact HMRC is holding substantial information on individual offshore accounts."
Francesca Lagerberg at the Institute of Chartered Accountants says: "This is a reduced penalty period, not an amnesty. And you'll have to explain where the money comes from."
Noshir Avari, a former tax inspector who runs specialist tax investigation consultancy Avari & Associates, agrees that some taxpayers will have a lot of explaining to do. He says HMRC wants disclosure from the less serious cases so it can concentrate its growing firepower on big offenders.
"This is an offer that only a fool would turn down, but it is not as clear cut as it might seem. By disclosing an offshore account, you also reveal a sum of money. The Revenue will want to know where that comes from. If you can't or won't say, you could be in serious trouble."
Finally, there are fraudsters and money launderers. This is a small but important group who could face criminal action.
"The second group need professional handholding or they could easily end up in group three," Mr Avari says.
Mr Oates adds: "You have to 'fess up' everything. A partial disclosure brings the risk the revenue will uncover other assets, leading to criminal prosecution."
Guidance for those with a guilty conscience
Who should disclose their offshore accounts?
Anyone with "UK domicile" (someone whose real or permanent home is in the UK) with untaxed interest from anywhere outside the UK. Hartley Foster from law firm DLA Piper says this definition runs from someone with a Euro account for their French holiday home to hardline evaders.
Are any tax havens outside the taxman's reach?
All banks with a UK presence have to divulge information if the Revenue asks. Dodgers using non-European centres such as the Turks & Caicos, the British Virgin Islands and Vanuatu may escape for the moment if they use local banks but most offshore holders opt for the security mainstream European banks offer. Hardcore evaders with even a small amount in a bank with a UK presence risk further investigation.
How do I make my disclosure?
See hmrc.gov.uk for details. You must own up by June 22 and pay tax, penalties and interest by November 26. The revenue has until April 30 2008 to accept your disclosure or to initiate further probes.
How much interest must I pay?
This is calculated on a year by year basis using an HMRC table. Your disclosure must include all unpaid tax over the past 20 years. For instance, someone owing £10,000 from 1992-93 will pay £10,040 in interest as well as a £1,000 penalty.
What happens if I don't disclose?
The Revenue will target those where there is a "mismatch" between information it already holds and tax returns. Penalties will be at least 30% and could be 100% - plus a criminal investigation in some cases.
t.levene@guardian.co.uk
Guardian Unlimited © Guardian News and Media Limited 2006