Young students who speak a different language at home than that spoken in school (i.e., a minority home-language) appear to exhibit a biased reading self-concept. Importantly, this biased reading self-concept may correspond with altered causal pathways between reading self-concept and achievement in minority home-language students. To test this idea, the authors examined cross-lagged links between reading self-concept and reading achievement in a large multiple-group longitudinal study in Germany. Students with German (n = 885), Turkish (n = 193), or another (n = 550) home language were tested yearly in grades 1-4 on measures of reading and reading self-concept. Despite showing lower reading achievement, students speaking a minority home language exhibited a higher reading self-concept. Cross-lagged paths revealed reciprocal effects between reading achievement and reading self-concept from grade 1 to grade 2, particularly for students with German as a home language. Minority home-language students showed significantly lower effects of reading achievement on their subsequent reading self-concept from grade 1 to grade 2. From grade 2 onward, reading achievement predicted reading self-concept, but not vice versa.