20 CFR 225.21 - Survivor Tier I PIA.
The Survivor Tier I PIA is used in computing the tier I component of a survivor annuity. This PIA is determined in accordance with section 215 of the Social Security Act using the deceased employee's combined railroad and social security earnings after 1950 (or after 1936 if a higher PIA would result) through the date of the employee's death.
Title 20 published on 2014-04-01
no entries appear in the Federal Register after this date.