The actual overall tax rates paid by corporations or big or large Corporates could be somewhat higher when figuring in the multitude of rates that these entities must pay on a worldwide basis. In the U.S., their payments come in far below the stated corporate rate, but these companies must still pay taxes to the overseas locations they do business in or locate their headquarters to.
Overall, it calls into question the need to reduce the official corporate tax rate, since it has little relation to the rates that American corporations or Indian Corporates actually pay.