The revised Syntec index measures changes in the cost of services in 2025 in the engineering, IT services, research and recruitment consultancy, and professional training sectors.
Its value reflects the evolution of salary costs (including charges). It is used, in particular, to index contracts for fixed-price projects, IT management, or software maintenance.
The revised Syntec index is calculated and published by the Syntec Federation (not INSEE) or by paying services such as “Le moniteur“. It was published in September 2022, replacing the old Syntec index.
Only the Syntec Federation will now monitor and publish the revised Syntec index. A “connection coefficient” has been calculated, equal to the ratio of the Revised Index of August 2022 and the last computed value of the old index, similar to 0.97975, i.e. (280.6 / 286.4). This adjustment coefficient may be necessary for contractual reasons.
Contents
Syntec index 2025
| Month & Year | Date of publication (or expected date of publication) | Revised Syntec Index | Change over 12 consecutive months in the revised index | Change / previous month of the revised index | Value to be used for contracts signed before August 2022 (revised index adjusted for the connection coefficient) |
| December 2025 | Expected publication date: 2026-01-30 | UNK | N/A | N/A | N/A |
| November 2025 | Expected publication date: 2025-12-31 | UNK | N/A | N/A | N/A |
| October 2025 | Expected publication date: 2025-11-28 | UNK | N/A | N/A | N/A |
| September 2025 | Expected publication date: 2025-10-31 | UNK | N/A | N/A | N/A |
| August 2025 | Expected publication date: 2025-09-30 | UNK | N/A | N/A | N/A |
| July 2025 | Expected publication date: 2025-08-29 | UNK | N/A | N/A | N/A |
| June 2025 | Expected publication date: 2025-07-31 | UNK | N/A | N/A | N/A |
| May 2025 | Expected publication date: 2025-06-30 | UNK | N/A | N/A | N/A |
| April 2025 | Expected publication date: 2025-05-30 | UNK | N/A | N/A | N/A |
| March 2025 | Expected publication date: 2025-04-30 | UNK | N/A | N/A | N/A |
| February 2025 | Expected publication date: 2025-03-31 | UNK | N/A | N/A | N/A |
| January 2025 | Expected publication date: 2025-02-28 | UNK | N/A | N/A | N/A |
The values in this table will be updated as the index is published in 2025
How to use the SYNTEC index?
Rule:
Service contract prices can be adjusted on each contract expiration date based on a formula incorporating changes in the Syntec index. The reference index used will be November or October.
Method for implementing the Syntec index formula
[New Price (P1)] = [Old Price (P0)] X [Known Reference Syntec Index (S1)] / [Reference Syntec Index (S0)] :
Tip:
For price revisions on the first of January of each year, it is advisable to take the November or October Syntec index as a baseline for practical reasons. Indeed, the December index is only known at the end of the following January, which is late for applying contractual price increases.
Finally, find out more about the history of the Syntec index.
Frequently Asked Questions (FAQ) on the Syntec Index
History of the Syntec index
View all Syntec index values from 2002:
Find all the values of the Syntec index:
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