The Government is today initiating a historic agreement with Switzerland to tackle offshore tax evasion in an effort to resolve the long-standing abuse of Swiss banking secrecy by those who seek to conceal the proceeds of tax evasion, this measure is expected to secure billions of pounds of unpaid tax for the UK exchequer starting from 2013.
Under the terms of the agreement, existing funds held by UK taxpayers in Switzerland will be subject to a significant one-off deduction of between 19% and 34% to settle past tax liabilities, leaving those who have already paid their taxes unaffected. As a gesture of good faith Swiss banks will make an up-front payment from Switzerland to Britain of CHF 500m.
From 2013, a new withholding tax of 48% on investment income and 27% on gains will ensure the effective future taxation of UK residents with funds in Swiss bank accounts. This will be accompanied by a new information sharing provision which will make it easier for HM Revenue and Customs to find out about Swiss accounts held by UK taxpayers. The new charges will not apply if the taxpayer authorises a full disclosure of their affairs to HMRC.
Source : http://nds.coi.gov.uk