British Prime Minister David Cameron, host of the two-day G-8 summit at a remote lakeside golf resort in Northern Ireland, promised "significant developments on tax" in a tweet before heading into a morning discussion on the subject with the leaders of the United States, Germany, Russia, France, Italy, Canada and Japan.
British lawmakers have sharply criticised Google, Starbucks and other US multinationals operating in Britain for exploiting accounting rules by registering their profits in neighbouring countries such as Ireland, which charges half the rate of corporate tax, or paying no tax at all by employing offshore shell companies.
"Of course Britain's got to put its own house in order," said Britain's treasury chief, Chancellor of the Exchequer George Osborne, who was invited to address the G-8 meeting on corporate tax reform.
Before the summit, Britain announced a provisional agreement with the finance chiefs of nine of its offshore dependencies to improve their sharing of information on individuals and companies banking cash there.
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One such manoeuvre, called the "double Irish with a Dutch sandwich" allows foreign companies to send profits through one Irish company, then to a Dutch company and finally to a second nominally Irish company that is headquartered in a usually British tax haven.
The US said it was committed to reforming the global accounting rules and collecting more of US companies' profits banked outside American shores.