Syntec index for May 2025

The revised Syntec index (base 100 in 1961) for May 2025 was published on June 30, 2025.

The value of the Syntec index for May 2025 is 318.3 to 313.3 in May 2024, an annual increase of + 1.60% over 12 months. It’s up +0.38% compared to the previous month (317.1 in April 2025).

Contents

Table of changes in the Syntec index for May 2025

	May 2025 Syntec Index	April 2025 Syntec Index	May 2024 Syntec Index
Syntec index value	318.3	317.1	313.3
Change in % from the base		Up 0.38%	Up 1.60%

The official source is Syntec Federation (not INSEE).

The value for May 2025, to be used for contracts signed before August 2022 (revised index corrected by the connection coefficient), is 311.9.

Our Syntec Index 2025 table has been updated here:

Revised Syntec Index corrected for the adjustment coefficient and monthly and annual percentage changes:

Publication dates of the revised Syntec Index 2025

All revised and historical Syntec index values for 2025

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“.

Official Syntec Index — Publication on June 30, 2025, of the Syntec index for May 2025

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 March 11, 1974. It is updated and published monthly, typically at the end of each month, with a one-month lag. The next index to be released is the Syntec June 2025 index, which will be released around July 31, 2025.

For companies in the technology and services sector, the Syntec Index is an essential tool for maintaining fair contracts aligned with 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 May 2025

What is the Syntec Index?

The Syntec Index is a French economic indicator primarily used for price adjustments in contracts for intellectual services, particularly in engineering, IT services, consulting, and research and development. It is used, in particular, to adjust the prices of services on long-term contracts to account for cost fluctuations.

What is the value of the Syntec index for May 2025?

The value of the Syntec index for May 2025 is 318.3. It is up 1.60% over the past year (as of May 2024) and up 0.38% compared to April 2025 (the previous month). The revised index corrected by the connection coefficient stands at 311.9.

How do you integrate the Syntec Index into a contract?

To integrate the Syntec Index into a contract, a price adjustment clause specifying that prices will be periodically adjusted based on the Syntec Index variation must be included. The frequency of the adjustment and the calculation formula must also be defined.

Can the Syntec Index decrease?

Yes, although rare, the Syntec Index can decrease if the costs of intellectual services decrease. This can happen in cases of significant reductions in salaries, social charges, or operating costs of the relevant companies. It may decrease from one month to the next, but rarely in the annual trend.

Are there alternatives to the Syntec Index?

Economic indices like the Consumer Price Index (CPI) or the Producer Price Index (PPI) can be used for contract price adjustments. However, the Syntec Index is designed explicitly for intellectual services and is the most relevant for this sector.

When is the Syntec Index published?

The Syntec Index is published monthly, usually at the end of each month, with a one-month lag.

Syntec Index History

Find all the values of the Syntec index since 2014:

Syntec Index History:

History of the Syntec index, a tool for measuring labor costs

What’s your opinion on the evolution of the Syntec index?

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The Syntec Index for May 2025 has been released