HMRC assigns dedicated compliance managers to more than 200 billionaires in the UK as part of a tax crackdown designed to raise £500 million for the public purse. The tax authority said it compiled for the first time a list of billionaires required to pay UK tax, regardless of whether they formally live in the country. The effort targets what HMRC calls a "wealthy tax gap" caused by those who do not pay what they owe. The compliance managers will have discussions with these customers.