The OECD aims to deliver in October a report on the economic impact of proposals under its attempt to redesign global corporate tax rules, an official from the group said.

Countries, especially those with small economies, need to understand the impact of the proposals on their revenue, growth, and investment, said Pascal Saint-Amans, director of the Organization for Economic Cooperation and Development’s Center for Tax Policy and Administration.

“So we will deliver as much as we...