Systems and methods for identifying and explaining errors in the preparation of a payroll tax form using error graphs

Computer-implemented systems, methods and articles for identifying errors in the computerized preparation of a payroll tax form to be submitted to a tax agency. The system includes a computing device, a data store, and a payroll tax form preparation software application executable by the computing device. The payroll tax form preparation software includes a payroll calculation engine, an error check engine, and one or more error graph(s). Each error graph includes a plurality of interconnected nodes configured to utilize tax data and calculated payroll data to identify errors. The calculation engine is configured to read tax data from the shared data store, perform payroll calculation operations, and write calculated payroll data to the shared data store. The error check engine is configured to read the tax data and payroll data and process the error graph(s) to identify errors. An explanation engine may generate narrative explanations of the errors.