An agreement by the G-7 to set minimum levels of corporate tax will need ratification by governments and, closer to home, faces an uphill battle in Congress.
A major international group is trying to prevent companies from shifting profits to countries with low tax rates.
OECD chief economist Laurence Boone says governments must double down on providing support to avoid "scarring effects."
The move escalates a trade dispute over how much tech companies can be taxed outside their home countries.
The Organization for Economic Cooperation and Development echoes central bankers, saying monetary policy alone can't spur global growth.
The OECD predicts lower growth than last year, from China to North America.
A new Organization for Economic Cooperation and Development report said that as younger generations are getting older, their experience of aging is dramatically different to those who came before. One big difference — growing inequality between the affluent and less well off. Click the audio player above to hear the full story.