a. When there is a previous primary insurance amount (PIA) computation under pre 1960
method, calculate the PIA under methods or formulas in effect before the 1960 amendments.
Determine the PIA as if the number holder (NH) were filing for RIB in the year following
the year of initial filing for RIB and using the methods in effect at the time of
the previous computation.
The NH can meet requirements for the new start even if not previously available. Closing
date is first day of the year after the NH's previous effective filing date.
b. When there is a previous PIA computation considered a 1960 method, determine the
PIA only under a 1960 method. The last base year is the year of initial filing or
previous recomputation filing, if later.