This paper analyzes the effects of language practice on earnings among adult male immigrants in Canada using the 1991 census. Earnings are shown to increase with schooling, pre-immigration experience and duration in Canada, as well as with proficiency in the official languages (English and French). Using selectivity correction techniques, it is shown that there is complementarity between language skills and both schooling and pre-immigration experience. That is, greater proficiency in the official languages enhances the effects on earnings of schooling and pre-immigration labor market experience. Language proficiency and post-migration experience appear to be substitutes, that is, those with greater proficiency have a smaller effect of time in Canada on earnings.