The taxman has blown the lid off the offshore interests of millions of Britons - exposing secret Swiss bank accounts and investments buried in the Caribbean.
Armed with new international tax data and tougher penalty powers, HM Revenue & Customs (HMRC) is understood to have sent out tens of thousands of warning letters to UK residents making money abroad.
As a result, more than 1,000 tax bills have been mailed this year — some demanding that sums of more than £100,000 be paid in less than a month.
Foreign earnings: HM Revenue & Customs is understood to have sent out tens of thousands of warning letters to UK residents making money abroad