Finance ministers from Group of Seven (G7) nations on Saturday pledged to commit to a global minimum corporate tax of at least 15 percent, rallying behind a U.S.-backed plan.  

"We ... commit to a global minimum tax of at least 15 percent on a country by country basis," said a statement at the conclusion of their London meeting. 

The G7 hopes to reach a final agreement at the July gathering of the expanded G20 finance ministers group, it added.