1. A non-transitory computer-readable medium storing computer-executable instructions that when executed by a computer including a processor cause the computer to generate assessment values, the instructions comprising instructions for: calculating, by the processor, a penalty and interest assessment value based, at least in part, on one or more debt categories; storing, by the processor, the penalty and interest assessment value in a data store; receiving, by the processor, a request for the penalty and interest assessment value and a calculation action parameter value, where the calculation action parameter value can be set to i) a standard forecast value or ii) a calculation details value; wherein the computer comprises a plug-in that receives the calculation action parameter value as an input selection parameter; determining, by the processor, the calculation action parameter value from the request and if the calculation action parameter value is determined by the processor to be set to the standard forecast value, the instructions cause the processor to: retrieve the stored penalty and interest assessment value from the data store; and display the retrieved penalty and interest assessment value on a display connected to the computer; if the calculation action parameter value is determined by the processor to be set to the calculation details value, the instructions cause the processor to: build the penalty and interest assessment value without retrieving the stored penalty and interest assessment value from the data store, wherein the building includes re-calculating the penalty and interest assessment value based, at least in part, on the one or more debt categories using data received with the request; populate one or more calculation details in data entry fields, where the calculation details include a set of line items that each i) correspond to a debt category and ii) show the effect of the debt category on the calculation of the penalty and interest assessment value; and display the calculated penalty and interest assessment value and the calculation details on the display connected to the computer; wherein after the displaying, the instructions cause the processor to discard and not store the calculated penalty and interest assessment value and the calculation details in the data store causing the computer to conserve storage space in the data store and reduce operations performed by the computer.