---
kind: "section"
citation: "31 C.F.R. § 359.11"
title: "31"
number: "359.11"
heading: "What is the semiannual inflation rate?"
url: "https://uscodex.org/cfr/31/359.11"
---

# §359.11. What is the semiannual inflation rate?


The index used to determine the semiannual inflation rate is the non-seasonally adjusted CPI-U (the Consumer Price Index for All Urban Consumers for the U.S. City Average for All Items, 1982-84 = 100) published by the Bureau of Labor Statistics of the U.S. Department of Labor. (For further information on CPI-U considerations, see appendix C to [part 359](/cfr/31/part359.md) at [section 1](/cfr/31/1.md).) The semiannual inflation rate reflects the percentage change, if any, in the CPI-U over a six-month period. We announce this rate twice a year, in May and November. The semiannual inflation rate we announced in May 2002 reflects the percentage change between the CPI-U figures from the preceding March 2002 and September 2001. The rate of change over the six-month period, if any, will be expressed as a percentage, rounded to the nearest one-hundredth of one percent. More specifically, the semiannual inflation rate will be determined by the following formula (the resulting rate will be rounded to the nearest one-hundredth of one percent):


## Notes

### Authority

Authority: 5 U.S.C. 301; 12 U.S.C. 391; 31 U.S.C. 3105.

### Source

Source: 67 FR 64278, Oct. 17, 2002, unless otherwise noted.