You need to look at the exact dates in your contract in order to determine the correct indices to use for price adjustment.
Firstly establish the Contract Date, i.e. what date was your contract signed? Once you have this date you can find out the last value of the index published at that point in time (B). If your contract was signed in Jan 2016 it may or may not be the Jan 2016 index figure of 154.2 that applies if the Jan 2016 figures had not yet been published at the Contract Date. It may be that the Dec 2015 figures were the latest available at the Contract Date.
You then apply this logic to establish the last value of the index published on the first anniversary of the Contract Date (L).
Organisations that publish indices usually record the exact date when they published the figures for a particular month.
Firstly establish the Contract Date, i.e. what date was your contract signed? Once you have this date you can find out the last value of the index published at that point in time (B). If your contract was signed in Jan 2016 it may or may not be the Jan 2016 index figure of 154.2 that applies if the Jan 2016 figures had not yet been published at the Contract Date. It may be that the Dec 2015 figures were the latest available at the Contract Date.
You then apply this logic to establish the last value of the index published on the first anniversary of the Contract Date (L).
Organisations that publish indices usually record the exact date when they published the figures for a particular month.
