Based on control-value theory, we expected reciprocal associations between school grades and students' achievement emotions. Existing research has employed between-person designs to examine links between grades and emotions, but has failed to analyze their within-person relations. Reanalyzing data used by Authors (2017) for between-person analysis, we investigated within-person relations of students’ grades and emotions in mathematics over 5 school years (N = 3,425 German students from the PALMA longitudinal study; 50.0% female). The findings from random-intercept cross-lagged modeling show that grades positively predicted positive emotions within persons over time. These emotions, in turn, positively predicted grades. Grades were negative predictors of negative emotions, and these emotions, in turn, were negative predictors of grades. The within-person effects were largely equivalent to between-person relations of grades and emotions. Implications for theory, future research, and educational practice are discussed
