The revised Syntec index (base 100 in 1961) for December 2025 was published on January 30, 2026.
The value of the Syntec index for December 2025 is 322.6, up from 314.8 in December 2024, giving an annual rate of 2.48% over 12 months. The December index is down 0.15% compared to the previous month (323.1 in November 2025).
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Table of changes in the Syntec index for December 2025
| December 2025 Syntec Index | November 2025 Syntec Index | December 2024 Syntec Index | |
| Syntec index value | 322.6 | 323.1 | 314.8 |
| Change in % from the base | Up 0.15% | Up 2.48% |
The official source is Syntec Federation (not INSEE).
The value for December 2025, to be used for contracts signed before December 2022 (revised index corrected by the connection coefficient), is 316.6. Our Syntec Index 2025 table has been updated here:
Revised Syntec Index corrected for the adjustment coefficient and monthly and annual percentage changes:
The Syntec index reflects the evolution of salary costs (mainly intellectual services) of companies in the professional branches of the Syntec Federation:
- “Syntec IT“,
- “Syntec Engineering“,
- “Syntec Group of Study and Consulting Unions“.
It is mainly used to update the financial clauses of engineering, contracted personnel, maintenance, and IT contracts. Its value is calculated each month based on a survey of representative companies.
The Ministry of Economics and Finance in France has recognized the Syntec index since December 11, 1974. It is updated and published monthly, typically at the end of each month, with a one-month lag. The following index will be released: the Syntec January 2026 index, expected to be released around February 27, 2026.
For companies in the technology and services sectors, the Syntec Index is a crucial tool for ensuring fair contracts that reflect actual costs. It provides an objective basis for price reviews and helps protect against unforeseen cost variations.
Frequently Asked Questions (FAQ) on the Syntec Index of December 2025
Syntec Index History
Find all the values of the Syntec index since 2014:
Syntec Index History:
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