Interagency Payment and Collection (IPAC) System
Interagency Payment and Collection (IPAC) System : "The automated intergovernmental information system developed by the Department of the Treasury for billing services and supplies for small agencies. IPAC is the fastest/least costly method for reimbursing other Federal agencies for costs incurred as a result of mission assignments". (FEMA, Mission Assignment SOPs Operating Draft, July 2007, p. 54)