---
kind: "unit"
title: "20"
title_heading: "Employees' Benefits"
key: "chII/subchB/part225"
level: "part"
label: "Part 225"
heading: "Primary Insurance Amount Determinations"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/20/chII-subchB-part225"
sections_count: 39
---

# Part 225 — Primary Insurance Amount Determinations

Title 20 C.F.R. — Employees' Benefits › Chapter II — Railroad Retirement Board › Subchapter B — Regulations under the Railroad Retirement Act

## Contents

- [Subpart A — General](/cfr/20/chII-subchB-part225-subpartA.md)
- [Subpart B — PIA's Used in Computing Employee, Spouse and Divorced Spouse Annuities](/cfr/20/chII-subchB-part225-subpartB.md)
- [Subpart C — PIA's Used in Computing Survivor Annuities and the Amount of the Residual Lump-Sum Payable](/cfr/20/chII-subchB-part225-subpartC.md)
- [Subpart D — Delayed Retirement Credits](/cfr/20/chII-subchB-part225-subpartD.md)
- [Subpart E — Cost-of-Living Increases](/cfr/20/chII-subchB-part225-subpartE.md)
- [Subpart F — Recomputing PIA's](/cfr/20/chII-subchB-part225-subpartF.md)
- [Subpart G — Adjusting PIA's](/cfr/20/chII-subchB-part225-subpartG.md)