The future governor of the Bank of England, Mark Carney, has commented that tax avoidance is "demonstrably a problem" in the UK and other countries.
Mr Carney currently heads Canada's central bank but will take the helm at the Bank of England in July.
Speaking in Washington, he said:
"If there's an ability of companies or individuals to persistently avoid tax, then the burden of fiscal adjustment falls on those who pay their fair share.
"They end up paying more than their fair share."