The Turkish Statistical Institute announced that changes will be made to the system for calculating and updating the Consumer Price Index (CPI) by base year from January 2026.
The Turkish Statistical Institute (TUIK) announced that in accordance with the decisions of the European Commission, the CPI base year will be updated to “2025=100” as of January 2026 in all European Union (EU) member states.
The organization's statement stated that “ECOICOP v2”, the latest version of the classification of personal consumption expenditure by purpose, will be used by member countries.
The following was noted in the statement: “In addition, the main source of CPI weighting should be national accounts of household final consumption expenditure. Within the framework of harmonization with the EU, all these comprehensive changes in the CPI calculation methodology will be implemented by TURKSTAT simultaneously with the union's member states from January 2026.” “HEADLINE: INFLATION WILL NOT CHANGE” In the statement, it was stated that the harmonization studies in question have been carried out as planned by TURKSTAT over the past two years and said, “In this direction, the base year '2003=100' currently used in the CPI will be updated to the base year '2025=100'. The current CPI historical series will be presented to the public in a restructured manner with the base year '2025=100' and 'ECOICOP' v2', maintains the chain index structure. This process will not represent a rebuild of the index but only regroups the existing historical data according to the new classification structure. Therefore, there will be no change in the overall inflation indicators for the '2003=100' base year period, with only differences due to classification changes in some of the sub-indices being seen used in the CPI is the Household Budget Survey and said: “In With the new CPI series, the weighting at the group level will be a more comprehensive and up-to-date National Accounts reflection of consumption trends will be derived from household final consumption expenditure data. Lower-level weights will continue to be determined by the Household Budget Survey. Thanks to this structure, the index aims to better reflect both comprehensive and detailed consumption patterns. “Full details on the methodological changes that will be implemented will be shared in the January 2026 CPI bulletin.”
