HMRC have got access to the automatic exchange portal of OECD. This portal is specially designed to exchange taxpayers’ details in different tax jurisdictions. Anyone who is a British national or domiciled in the UK is subject to British Tax. HMRC can access details of their moveable and immovable assets, including bank accounts and properties. Not all taxpayers get a letter of Code of Practice 9 when HMRC have received information through this portal. Most of the times, they will be asked to file disclosure and disclosed any undisclosed income and assets without opening an inquiry or investigation. Read more about Common Reporting Standards – guidelines for exchanging taxpayer data between world tax jurisdictions.