Where do HMRC get their Information?
HM Revenue & Customs use many different sources to obtain information regarding individuals and companies. This information is then evaluated to identify the possibility of any tax irregularities. Examples of such sources include:
Other Revenue departments
Various government departments will share information.
Third parties who come into possession of information and report this directly to HM Revenue & Customs. With the Revenue actually running television adverts encouraging members of the public to come forward with information regarding individuals that are committing tax fraud, this is obviously thought by the Revenue to be a highly valuable source of information.
Examples of such may include employees, neighbours, ex-spouses, customers
Institutions such as banks are required to pass on information regarding deposits and cash transactions.
Overseas Tax Authorities
Information is passed between authorities form different countries especially the US and Europe.