British Prime Minister David Cameron took the unprecedented decision to release his personal tax records on Saturday, as growing anger over revelations in the Panama Papers threatened to derail his premiership.

But the extraordinary move seems set to plunge David Cameron into further controversy, as it emerged that his mother transferred two separate payments of £100,000 to his accounts in 2011, allowing the family estate to avoid a potential £80,000 worth of inheritance tax.

Four years after first promising to open his financial affairs to public view, Downing Street published a document detailing Cameron’s income and tax payments from 2009-10 to 2014-15. The move came after an emotional Cameron admitted to the Conservative party’s spring forum that he alone was to blame for the furore caused by his failure to be frank about his profits from an offshore investment fund.

On Monday, Cameron will announce the establishment of a taskforce, led by HM Revenue & Customs and the National Crime Agency, to examine the legality of the financial affairs of companies mentioned in the Panama Papers, where documents relating to his father’s offshore fund were discovered by the Guardian and the International Consortium of Investigative Journalists.

The taskforce will draw on investigators, compliance specialists and analysts from HMRC, the National Crime Agency, the Serious Fraud Office and the Financial Conduct Authority. There will be new money provided of up to £10m.

But following the release of the prime minister’s tax records, Cameron now faces questions over whether his family took elaborate steps to minimise the amount of inheritance tax that would eventually be due on their estate.

The records show that the prime minister received a considerable boost to his savings in 2011. Following the death of his father in 2010, Cameron was left £300,000 tax free as an inheritance. However, his mother also transferred two payments of £100,000 to him in May and July 2011.

Inheritance tax is not payable on gifts up to £325,000 that are paid at least seven years before the source of the possession dies, be it property or money.

A spokesman for the prime minister said that Cameron’s mother and father had “some years earlier” transferred the family home to their eldest son, Alexander Cameron, and the sums paid in 2011 were considered to be Cameron’s share.

Speaking in central London, Cameron admitted: “It has not been a great week. I know that I should have handled this better, I could have handled this better. I know there are lessons to learn and I will learn them. Don’t blame No 10 Downing Street or nameless advisers, blame me.”

(The Guardian)