Wage inequalities exist between non-disabled people and people with childhood-onset disability. This article investigates the underlying mechanisms using the French Employment Survey 2011 and its ad hoc module. Depending on the types and degrees of impairment, different dynamics are involved: shorter education for people with a cognitive or a mobility impairment, less access to highly paid professional situations for people with a serious visual impairment, lower wage at equivalent position for people with a serious visual or hearing impairment. Some specialized institutions and professional standards contribute to creating these gaps.