He said such a tax would be in line with a proposal at the weekend by British prime minister Gordon Brown, who urged world governments to consider imposing a levy on banks.

Mr Strauss-Kahn, speaking by telephone, said his organisation was not pursuing a global tax on financial transactions - a so-called "Tobin tax" - one of several options floated by Mr Brown. But British media reports suggesting there is a split between the IMF and Britain on the idea of imposing a levy are wrong, Mr Strauss- Kahn said.

"We're not working on a Tobin tax at the IMF" because such a tax would risk being unworkable, he said. "We're working on a tax on the financial sector which, in line with what Gordon Brown said, would solicit an insurance premium from a business activity that is riskier than others."

The IMF will present concrete proposals for the tax next April to finance ministers of the Group of 20 leading economies, for review before submission to G20 leaders in June. Mr Brown's statement at a G20 meeting in Scotland on Saturday marked a shift for Britain, which had previously backed away from supporting a global tax on banks given London's pre-eminence as a financial centre.

Facing public criticism for spending tens of billions of pounds in bailing out British banks, Mr Brown said it was time for banks to give something back to society. "There have been proposals for an insurance fee to reflect systemic risk or a resolution fund or contingent capital arrangements or a global transaction levy," he said.

Soon after Mr Brown spoke, US treasury secretary Timothy Geithner rejected the idea of an across-the-board tax. "A day-by-day financial transaction tax is not something we are prepared to support," he told Sky News.

But yesterday, Mr Strauss-Kahn said he did not take this as a death-knell for tax ideas the IMF was studying: "What Geithner said was, 'We're not in favour of a day-to-day tax.' That day-to-day tax is effectively something akin to a Tobin tax."

Mr Strauss-Kahn said regulators and governments were working on two fronts: tougher regulation of banks to prevent crises, and a levy to fund future bank bailouts which would limit the cost to taxpayers.

Regulators are drafting stricter rules for banks under the auspices of the Financial Stability Board, another international forum. If the new regulations are strong and respected enough, the levy on banks will be less necessary, Mr Strauss-Kahn said.

But if governments ultimately balk at imposing tough regulation, the levy would be there to offset that dilution, he added. "It's a trade-off."

Asked whether governments might have difficulty agreeing on controversial and technically complex details of a levy on banks, Strauss-Kahn replied: "The mandate came from G20 leaders. At least in Pittsburgh they agreed to work on this.

"Will they agree to implement it? I'm not divine so I can't tell you for now what will happen next June." - (Reuters)

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