Derived consumer price index

The derived consumer price index (CPI derived) is the price index that excludes the effect of changes in the rates of product-related taxes (e.g. VAT or excise taxes on alcohol or tobacco) as well as subsidies and consumption-related taxes (e.g. motor vehicle tax).

The price index approximates what the price change would have been if tax rates had remained the same, and it is for example used in salary adjustments.