Brazil's president Lula da Silva wanted to go further.
But the G20 countries could only agree on vague phrases about cooperating to try to ensure that the super-rich are taxed more effectively.
In a statement from the meeting of the G20 finance ministers in Rio de Janeiro, it is stated that countries should strive to also tax the very richest individuals in a way that is in line with ordinary income earners.
"Wealth and income disparities undermine economic growth and social cohesion and exacerbate social vulnerability", it says in the statement from the meeting, which is a cooperative body for the world's 20 largest economies.
But how taxation can be implemented is not specified, and there are no openings for proposals for a minimum allowed tax rate or global taxes.
However, Brazil's finance minister Fernando Haddad believes that an insight is spreading.
From a moral standpoint, it is important that we, the twenty richest nations, acknowledge that it is a problem that we have progressive taxation for the poor but not for the rich, said Haddad.
Brazil has wanted a minimum tax for the richest, while France, Spain, South Africa, several African countries, and Colombia have supported ideas of a global tax for billionaires. However, the USA and Germany, among others, are completely opposed.
