31 CFR § 359.13 - What are composite rates?

---
identifier: "/us/cfr/t31/s359.13"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "31 CFR § 359.13 - What are composite rates?"
title_number: 31
title_name: "Money and Finance: Treasury"
section_number: "359.13"
section_name: "What are composite rates?"
chapter_name: "FISCAL SERVICE, DEPARTMENT OF THE TREASURY"
subchapter_number: "A"
subchapter_name: "BUREAU OF THE FISCAL SERVICE"
part_number: "359"
part_name: "OFFERING OF UNITED STATES SAVINGS BONDS, SERIES I"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "5 U.S.C. 301; 12 U.S.C. 391; 31 U.S.C. 3105."
regulatory_source: "67 FR 64278, Oct. 17, 2002, unless otherwise noted."
cfr_part: "359"
---


# 359.13 What are composite rates?

Composite rates are single, annual interest rates that reflect the combined effects of the fixed rate and the semiannual inflation rate. The composite rate will always be greater than or equal to 0.00%.

[73 FR 65544, Nov. 4, 1008]