UK building societies, including the Nationwide, and former mutuals have become the latest HMRC targets in a crackdown on offshore accounts, according to newspaper reports.
HMRC has warned its new disclosure opportunity (NDO) will be the final chance for people with unpaid taxes linked to offshore accounts to settle up.
An accountant millionaire has pleaded guilty to filing a false tax return, making him the first US citizen to face criminal charges stemming from Swiss UBS records controversially procured by the US federal government.
Offshore jurisdictions flouting their pledges to comply with international standards have been threatened with sanctions at a Berlin meeting of International finance ministers.
The UK and Guernsey governments have signed a tax information exchange agreement (TIEA) in a bid to prevent tax evasion.
HMRC will crackdown on UK residents using Liechtenstein bank accounts for tax evasion.
Isle of Man Finance has urged clients with offshore accounts to seek tax advice after HM Revenue and Customs asked private banks and wealth managers to reveal details of offshore account holders.