JPMorgan Chase & Co. Chief Executive Officer Jamie Dimon has told U.K. Chancellor of the Exchequer Alistair Darling that his 50% tax on banker bonuses would unfairly penalize the U.S. lender, a person close to the company said.

Dimon, 53, mentioned plans to build a $2.4 billion European headquarters in London's Canary Wharf district as an example of the New York company's commitment to the British capital, the person said. Dimon reiterated that the banking company pays British taxes and did not take a U.K. taxpayer bailout, the person said, declining to be identified because the conversation was private.

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