[Code of Federal Regulations] [Title 24, Volume 2] [Revised as of April 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 24CFR203.21] [Page 158] TITLE 24--HOUSING AND URBAN DEVELOPMENT CHAPTER II--OFFICE OF ASSISTANT SECRETARY FOR HOUSING--FEDERAL HOUSING COMMISSIONER, DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT PART 203_SINGLE FAMILY MORTGAGE INSURANCE--Table of Contents Subpart A_Eligibility Requirements and Underwriting Procedures Sec. 203.21 Amortization provisions. The mortgage must contain complete amortization provisions satisfactory to the Commissioner, requiring monthly payments by the mortgagor not in excess of his reasonable ability to pay as determined by the Commissioner. The sum of the principal and interest payments in each month shall be substantially the same.