Expected CPI

Last updated 9 November 2026

1 GIAnalyzer function for Excel. Optional arguments are shown in [brackets].

GIA_IR_ExpectedCPI

Interpolates the expected CPI for a specific date, given an expected CPI curve and seasonality.

GIA_IR_ExpectedCPI(CPICurveDates, CPICurveRates, Season, VDate, TDate, LagV, LagT)

Argument	Use	Description
`CPICurveDates`	Required	The array of dates in the expected CPI curve. The first date has to be equal to the value date.
`CPICurveRates`	Required	The array of rates in the expected CPI curve. The first rate has to be equal to the last published CPI before the value date.
`Season`	Required	An array of 12 numbers, each of which represents the difference between the average monthly inflation rate and the inflation rate in a specific month.
`VDate`	Required	The value date.
`TDate`	Required	The target date for the interpolation.
`LagV`	Required	The difference in months between the month of the value date and the last month included in the latest CPI. See the documentation for full description.
`LagT`	Required	The difference in months between the month of the target date and the last month included in the latest CPI. See the documentation for full description.