Other sources of income include amounts billed to third parties for services other than assurance and advisory services. This relates to housing expenses and IT services charged externally, primarily to KPMG Meijburg & Co and KPMG International, which occupy buildings leased by the Group. Furthermore, the Group employs personnel working for KPMG International at KPMG Staffing & Facility Services B.V. These costs are rebilled in full to KPMG International.