The purpose of this paper is to investigate the effect of management ability on overproduction and sales prediction. The sample examined in this research includes 138 companies admitted to the Tehran Stock Exchange between 2008 and 2023, which were selected by systematic elimination. To test the hypotheses, the method of correlation between variables and multiple regression equations has been used. The research results indicate that as management ability increases, the likelihood of company contributing to overproduction decreases. If management with a high ability level predicts that it will have higher sales next year to avoid inventory shortages, it will overproduce this year. Also, the results of the hypothesis test showed that managers with high ability do not use overproduction for the purposes of natural earnings management, thus, in the following year, the incidence of overproduction will be reduced.