Group of 20 nations have agreed to work together to make the super rich pay their taxes, but stopped short of a more substantial deal, according to a declaration adopted Friday after a meeting of finance ministers in Rio de Janeiro.

The thorny topic of tackling tax-dodging billionaires dominated the two-day meeting in the Brazilian city, which will host the next G20 summit in November.

The initiative is a key priority for Brazilian President Luiz Inacio Lula da Silva, who heads this year's grouping, which includes the world's major economies, the European Union and the African Union.