I am quite new with this all, but I do understand the basics of Power Pivot (and a bit about Power Query).I have a source file, which consist out of records build up like: ContractNr, Full_Amount, Start_Date, End_Date. Now I would like to have an overview of how much I have to pay in a certain month over all the contracts. Some contracts are active, some are not, however that is dependent on the start- end and date. I know I can solve this with some SQL scripting in a SQL server, however if this can be done directly in PowerPivot (based on the data model as described), that would be great. Thanks for any help, Victor