Abstract: Described are methods and apparatuses, including computer program products, for quality control of investment performance calculations. Performance data associated with one or more investment accounts is received by a server computing device. A tolerance range associated with the performance data is generated. A portion of the performance data is identified for filtering based on the tolerance range. The identified performance data is processed through a plurality of filters, wherein the filters are based on predefined rules. A first portion of the filtered data is marked as requiring no further review. A second portion of the filtered data is marked as requiring further review.