Entrepreneur Robert Gaines-Cooper today lost his appeal in the Supreme Court over whether he could rely on HMRC guidance to determine residency, in a dispute stretching back almost 20 years.
An internal HMRC memo sent to a taxpayer in error has suggested the Revenue service is hiding mistakes and concealing vital information from the public.
About six million people are set to receive tax rebates averaging £400, while another million will learn they have underpaid their tax by about £600.
Swiss bank account holders who have legitimate reasons for keeping their money offshore may still be on the taxman's hit list, accountants warned.
Employers dread filling in paperwork for the taxman, especially those with a large staff turnover.
The British economy needs "a shot of adrenaline" in the form of tax cuts in order to stimulate growth, according to a leading think tank.
Her Majesty's Revenue and Customs (HMRC) has warned UK residents and organisations with Swiss bank accounts to declare any outstanding tax before it begins investigations.
Hargreaves Lansdown is one of only two companies in the FTSE 100 which has not located any of its subsidiaries in a tax haven.
The taxman handed out a record one and a half million fines to late filers this year, with penalties up 56% in just five years, according to a Freedom of Information request.
Today's tax deal between the UK and Switzerland, designed to recoup £7bn from Brits with funds in Swiss bank accounts, is "unrealistic", according to accountants Baker Tilly.