The Guardian says Brown’s renewed commitment comes after a survey shows more than half of voters would back the plan if the proceeds were used to help society’s poorest.
According to a YouGov poll 53 per cent of voters are in favour of the idea and only 28 per cent are against.
In August FSA chairman Lord Turner floated plans to introduce a new tax on financial transactions in the City, which would cut bank profits and the assets available for bonuses.
He said such a tax would be “a nice sensible revenue source for funding global public goods”.
In September the CBI dismissed the tax and criticised Turner for taking a moralistic stance against the banking industry.
CBI director general Richard Lambert said there was no point in introducing the tax in one country if it was not enforced elsewhere in the world.
Brown supported a Tobin tax earlier this month but backtracked after widespread international criticism of the idea.