[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: 20CFR228.13] [Page 469] TITLE 20--EMPLOYEES' BENEFITS CHAPTER II--RAILROAD RETIREMENT BOARD PART 228_COMPUTATION OF SURVIVOR ANNUITIES--Table of Contents Subpart B_The Tier I Annuity Component Sec. 228.13 Computation of the tier I annuity component of a parent's insurance annuity. The tier I annuity component of a parent's insurance annuity is dependent on whether one or two parents are entitled. (a) One parent entitled. A parent's tier I annuity component is equal to 82\1/2\ percent of the PIA computed under Sec. 228.10 of this part. (b) More than one parent entitled. A parent's tier I annuity component is equal to 75 percent of the PIA computed under Sec. 228.10 of this part. (c) The amounts computed under paragraph (a) or (b) of this section may be adjusted for the family maximum. See Sec. 228.14 of this part.