A data processing system for processing loan data for a plurality of loans including a data storage system configured to store loan data for the plurality of loans and a user interface including one or more web pages configured to enable a servicer using a remote computing system to transfer loan data over the Internet to and from the data processing system. The user interface includes a loan activity processing function configured to receive servicer loan data including loan activity data from the servicer, a trial balance processing function configured to enable the servicer to submit servicer loan data for comparison with the stored loan data, and a loan level browsing function configured to allow the servicer to view stored loan data. The data processing system further includes loan process and compare logic which includes an amortization/calculation processor configured to perform validation calculations on servicer loan data based on stored loan data, a loan activity processor configured to process the loan activity data, validate the loan activity data based on the stored loan data, and update the stored loan data based on the loan activity data. The loan process and compare logic further includes a trial balance processor configured to compare servicer loan data with stored loan data.