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Zac Goldsmith has made more than £10 million in income and capital gains since being elected an MP, it emerged today — as he took the unprecedented step of publishing details of his personal tax returns.

The disclosures come after Labour challenged the multi-millionaire Tory mayoral candidate to “come clean” over his former status as a “non-dom” taxpayer.

The returns show he has paid more than £4.5 million in tax on his worldwide income and capital gains — a rate of 46 per cent. His taxable income since 2010 has totalled just over £6 million, the vast majority from a family trust set up by his billionaire father. He has made a further £4.3 million in profits from selling assets.

His average annual income of £1.2 million is 36 times the median salary of £33,203 for full-time workers in the capital and puts him in the highest-earning 0.05 per cent of UK tax- payers.

The personal financial information was disclosed in a letter from his accountants PwC that included details of his income, capital gains and tax payments over the past five years.

It reveals that Mr Goldsmith, believed to be the wealthiest member of the Commons, paid an average of 46 per cent income tax over the five years, in line with the current 45 per cent top rate on earnings. He also pays national insurance on his £74,000-a-year salary as MP for Richmond Park. Mr Goldsmith, who this weekend said he would be voting for Britain to leave the European Union, pledged to publish his tax returns last week for the sake of transparency after coming under fire over his finances.

Today he called on his rivals including Labour’s Sadiq Khan, Green Sian Berry and Respect’s George Galloway to follow suit.

Mr Goldsmith said: “I have today published my tax return details, prepared and verified by PwC... I gave a commitment to do so and today I deliver on that promise.

“I look forward to all mayoral candidates doing the same so London voters can judge us equally.”

Mr Goldsmith admitted he had been “dealt a good hand in life” — he is thought to be worth between £200 million and £300 million — but said he was determined to “play it well”.

After a grilling on his former non-dom status, which he held until 2009, he insisted that he has always paid full tax on his income in the UK because he has always lived here. Tory campaign insiders said Mr Goldsmith had taken home “virtually nil” as a result of the non-dom tax benefit.

The only money he is believed to have earned overseas comes from a two-year period he worked for a charity in California.

He said: “As well known to voters in my two elections as an MP, I became ‘non-dom’ automatically because of my father’s international status. It was not a choice, and I relinquished it seven years ago.

“I was born, grew up and have always lived in London — except for two years travelling abroad in my early twenties. Because of this I derived very little, if any, benefit from this status as my income came to the UK and was therefore taxed here.”

He inherited his non-dom status from his father, billionaire financier Sir James, who died in 1997 leaving a £1.2 billion fortune which is now in a trust run from Geneva for the benefit of his children. Mr Goldsmith, 41, relinquished his non-dom status before becoming an MP. He and his wife are understood to have a mortgage for their home in Barnes, and he sold his West Country estate in 2012.

Non-dom status, often seen as the preserve of the rich, means individuals pay tax on UK earnings but not on any foreign income or foreign capital gains. Mr Goldsmith said he was “proud of my record”, but he is certain to face questions over why he did not give up non-dom status earlier.