20 CFR § 225.20 - General.

---
identifier: "/us/cfr/t20/s225.20"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "20 CFR § 225.20 - General."
title_number: 20
title_name: "Employees' Benefits"
section_number: "225.20"
section_name: "General."
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"
---


# 225.20 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.