- United Kingdom
HM Revenue & Customs (HMRC) is much more than 'the tax man'. HMRC is over 66,000 people serving around 33 million customers. HMRC is the UK's biggest business, with annual revenue of £436 billion. As well as collecting tax, HMRC administer benefit payments, help to protect national interests and carry out the fascinating, wide ranging work that helps to keep Britain in the black.