[Code of Federal Regulations] [Title 20, Volume 1] [Revised as of April 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 20CFR229.1] [Page 478] TITLE 20--EMPLOYEES' BENEFITS CHAPTER II--RAILROAD RETIREMENT BOARD PART 229_SOCIAL SECURITY OVERALL MINIMUM GUARANTEE--Table of Contents Subpart A_General Sec. 229.1 Introduction. This part explains when an annuity can be increased under the social security overall minimum guarantee, also sometimes referred to as the ``special guaranty'', and how the increased amount is determined. Deductions and reductions in the overall minimum rate are explained.