£3bn due in Liechtenstein tax plan The revenue body believes the agreement over the tax haven, which was originally predicted to raise £1bn, will produce up to £3bn from a much larger number of people coming forward than previously anticipated. Tax dodgers who fail to volunteer their actions face much tougher fines amounting to 200pc of their unpaid tax, as well as back taxes and interest, and in the most serious cases, prosecution. The agreement between the two countries was originally scheduled to run to March 2015, but has since been extended to April 5 2016. Dave Hartnett, permanent secretary for tax at HMRC, said the LDF had been an "overwhelming success." He said: "HMRC originally estimated the number of people who would register for the disclosure facility at 2,000, and that it would probably produce £1 billion. In light of the ongoing success of the LDF we now anticipate the arrangements will produce up to £3 billion from a much larger number of people. Co-operation between the UK and Liechtenstein authorities was recently strengthened further by a double-taxation agreement between the two countries to ensure people are paying the right amount of tax and not being taxed twice.