The U.S. Department of Housing and Urban Development (HUD), Office of Inspector General, audited CitiMortgage, Incorporated (CitiMortgage). Our audit objectives were to determine whether CitiMortgage followed U.S. Department of Housing and Urban Development (HUD) requirements for underwriting loans and performing its quality control program for single-family production. We concluded that CitiMortgage did not properly underwrite 20 of the 60 defaulted loans reviewed. These loans had material underwriting deficiencies that affected the insurability of the loans. In addition, CitiMortgage did not meet HUD's quality control requirements.