A mobile collection application is disclosed that is capable of providing collection data to a field agent on a wireless pocket PC. A collection case inventory module is used to generate a list of collection cases on the wireless pocket PC. The field agent may view a detailed report of collection cases that are contained in the list of collection cases. A payment plan component is also provided that allows the field agent to work out a payment plan with the debtor. The mobile collection application is also capable of allowing field agents to register transient taxpayers for the purpose of collecting sales and use taxes.