Creating a report to show those exempt from Federal Income Tax

I have a requirement to build a report that shows those who are exempt from federal income tax. I have searched through subject areas and data lineage and I can't find an exempt marker from FIT or any taxes. Does anyone have any insight as to easiest way to create this report to show employees who are exempt as well as their withholding amount? Would this be easier to create as a BIP report or a standard analysis?