CPI to have three figures after decimal starting in 2007

The Consumer Price Index will have three figures after the decimal point beginning with the January 2007 number, which will be reported in February. Currently the CPI has just one figure after the decimal point. Percent changes in the index will continue to be reported to one decimal place.

The Bureau of Labor statistics has more inforamtion on the change at Publishing Consumer Price Indexes to Three Decimal Places: Questions and Answers.

The Treasury will use the more precise figures to calculate earnings and values for Series I Savings Bonds and TIPS. The Treasury's statement is at Statement concerning Bureau of Labor Statistics announcement changing CPI precision and Treasury inflation indexed securities.