This study supports the claim that the degree of a newcomer’s English language proficiency is a strong predictor of success in the workplace.
Working-age LEP adults earn 25 to 40 percent less than their English proficient counterparts. While less educated overall than English proficient adults, most LEP adults have a high school diploma, and 15 percent hold a college degree. LEP workers concentrate in low-paying jobs and different industries than other workers.
Jill Wilson, Investing in English Skills: The Limited English Proficient Workforce in U.S. Metropolitan Areas. Brookings, 2014.