Proposal could net up to $250bn a year in extra revenue, says report commissioned by Brazil for G20

An international scheme to tax the wealth of the world’s 3,000 billionaires is technically feasible and could net up to $250bn (£197bn) a year in extra revenue, a new report says.

A study by the French economist Gabriel Zucman concluded that progress in finding ways to tax multinational corporations meant it was now possible to levy a global tax on individuals – even if not every country agreed to take part.