The revised Syntec index measures changes in service costs in 2025 across 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 as the ratio of the Revised Index of August 2022 to the last computed value of the old index, i.e., 0.97975 (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 | 2025-12-31 | 323,1 | +2.02% | +0.28% | 316.6 |
| October 2025 | 2025-11-28 | 322.2 | +2.29% | +0.16% | 315.7 |
| September 2025 | 2025-10-31 | 321.7 | +2.29% | +0.19% | 315.2 |
| August 2025 | 2025-09-30 | 321.1 | +2.23% | +0.25% | 314.6 |
| July 2025 | 2025-08-29 | 320.3 | +2.14% | +0.22% | 313.8 |
| June 2025 | 2025-07-31 | 319.6 | +1.95% | +0.41% | 313.1 |
| May 2025 | 2025-06-30 | 318.3 | +1.60% | +0.38% | 311.9 |
| April 2025 | 2025-05-30 | 317.1 | +1.05% | +0.13% | 310.7 |
| March 2025 | 2025-04-30 | 316.7 | +1.41% | +0.44% | 310.3 |
| February 2025 | 2025-03-31 | 315.3 | +1.35% | +0.03% | 308.9 |
| January 2025 | 2025-02-28 | 315.2 | +1.51% | +0.13% | 308.8 |
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 at each contract expiration date using a formula that incorporates changes in the Syntec index. The reference index used will be either October or November.
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 too late to apply 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 since 2013:
Find all the values of the Syntec index:
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