[Code of Federal Regulations] [Title 20, Volume 1] [Revised as of April 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 20CFR225.20] [Page 448] TITLE 20--EMPLOYEES' BENEFITS CHAPTER II--RAILROAD RETIREMENT BOARD PART 225_PRIMARY INSURANCE AMOUNT DETERMINATIONS--Table of Contents Subpart C_PIA's Used in Computing Survivor Annuities and the Amount of the Residual Lump-Sum Payable Sec. 225.20 General. The Survivor Tier I PIA and the Employee RIB PIA are used in computing the tier I component of a survivor annuity. The Combined Earnings PIA, Social Security Earnings PIA and Railroad Earnings PIA may be used in computing a vested dual benefit offset in the survivor tier II component when the survivor tier II is based on a percentage of the employee annuity tier II. In addition, these three PIA's are identical to those dual benefit PIA's used in computing an employee retirement annuity, as described in subpart B of this part, when the employee died after being entitled to an annuity. Survivor annuity computations are discussed in part 228 of this chapter. The Residual Lump-Sum PIA (RLS PIA) is used in computing the amount of the residual lump-sum payable when retirement annuity payments were made, as explained in part 234 of this chapter.