Global Corporate-Tax Overhaul Advances as 136 Nations Sign On

A vast overhaul of corporate taxation won support from 136 countries, as governments resolved key differences over the level of a global minimum rate and an end to new digital taxes that the U.S. has deemed discriminatory.

After years of missed deadlines and wrangling over how to handle tech firms such as Facebook Inc. and Alphabet Inc.’s Google, Friday’s deal included a 15% minimum rate for corporations and the main parameters of how much profits of the 100 or so biggest multinationals would be taxed in more countries: 25% of profits over a 10% margin.

The deal moves a ...