20 CFR § 225.21 - Survivor Tier I PIA.

---
identifier: "/us/cfr/t20/s225.21"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "20 CFR § 225.21 - Survivor Tier I PIA."
title_number: 20
title_name: "Employees' Benefits"
section_number: "225.21"
section_name: "Survivor Tier I PIA."
chapter_name: "RAILROAD RETIREMENT BOARD"
subchapter_number: "B"
subchapter_name: "REGULATIONS UNDER THE RAILROAD RETIREMENT ACT"
part_number: "225"
part_name: "PRIMARY INSURANCE AMOUNT DETERMINATIONS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "45 U.S.C. 231f(b)(5)."
regulatory_source: "54 FR 12903, Mar. 29, 1989, unless otherwise noted."
cfr_part: "225"
---


# 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.