France and Germany want G7 finance ministers to mandate the Organisation for Economic Co-operation and Development to revisit its blacklist of tax havens, in an effort to step up the momentum against tax evasion in the wake of Germany's big Liechtenstein tax investigation this year.

The initiative, to be discussed at the G7 meeting in Osaka, Japan, on June 13, could result in reinstating laggard countries on to the list of "uncooperative tax havens" run by the OECD, the body co-ordinating global action against such financial centres, a French official said.