Promoters of aggressive tax avoidance schemes will be forced to disclose their client lists to inspectors under a new crackdown, the Government will announce today.
Think tank scheme operators will be "named and shamed" for sharp practice, Treasury Minister David Gauke will tell the Policy Exchange.
It follows a wave of revelations about the financial loopholes used by the rich and famous to legally side-step hefty tax bills.
Last month comedian Jimmy Carr admitted to making a "terrible error of judgment" after it emerged he was using a scheme to pay an income tax rate as low as 1%.
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The letter was signed by the CBI, British Chambers of Commerce, the EEF, the Institute of Directors and the Federation of Small Businesses.
A spokesperson said Rory Stewart's remarks were in line with the British government’s stated position.
The minister's intervention will come a week after Trump decertified the landmark agreement claiming it was not in the US national interest.