Calculating CIL

Index of inflation

Schedule 1 of the CIL Regulations requires collecting authorities to apply an index of inflation. There are two index values the Council must apply, the first is the index value when the Charging Schedule was adopted (Ic) and the second is the index value on the date that planning permission was granted (Ip).

The Index figure for a given year is the figure published by the Building Cost Information Service (BCIS) of the Royal Institution of Chartered Surveyors  on the 1 November in the preceding year.

From the 1 January 2021 local authorities in areas which charge the levy should use the figure for 1 November for the preceding calendar year (2020).

Year Index Published
2020 334 28 October 2019
2021 333 26 October 2020
2022 332 25 October 2021
2023 355 24 October 2022


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