September 2026 Syntec Index: Calculations, Trends and Analysis

The revised Syntec Index (base 100 in 1961) for September 2026 was published on October 30, 2026.

It stands at 320.4, down 0.40% year on year and unchanged month on month. After applying the linking coefficient, the adjusted index stands at 313.9.

Please note: the 0.40% year-on-year decline in the Syntec Index in September 2026 remains an unusual development. Following the 0.22% annual decline recorded in August, this second consecutive decrease confirms a notable change in trend. It does not necessarily mean that individual salaries have fallen overall, as the index is based on payroll costs and workforce levels from a panel of companies and is smoothed over a 12-month period. This development should therefore be interpreted with caution.

Contents

Table of changes in the Syntec Index for September 2026

	September 2026 Syntec Index	August 2026 Syntec Index	September 2025 Syntec Index
Syntec Index value	320.4	320.4	321.7
Change in %		No change	Down 0.40%

September 2026 Syntec Index

The official source is the Syntec Federation (not INSEE).

The value for September 2026 to use for contracts signed before September 2022 (revised index after applying the linking coefficient) is 313.9.

Our Syntec Index 2026 table has been updated here:

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

All revised and historical Syntec index values for 2026

The Syntec Index reflects changes in labor costs for companies in the digital, engineering, and consulting sectors represented by the Syntec Federation.

It is mainly used to revise the financial clauses of engineering, staffing, maintenance, and IT contracts. Its value is calculated each month based on a survey of representative companies.

Official Syntec Index — The September 2026 Syntec Index was published on October 30, 2026

The French Ministry of the Economy and Finance has recognized the Syntec Index since March 11, 1974. It is updated and published monthly, generally at the end of the month, with a 1-month lag. The next index is expected around November 30, 2026: the October 2026 Syntec Index.

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 September 2026

What is the Syntec Index?

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

What is the Syntec Index value for September 2026?

The Syntec Index value for September 2026 is 320.4. It is down 0.40% year-on-year (compared with September 2025) and unchanged month-on-month (compared with August 2026). The value adjusted using the linking coefficient, applicable to contracts signed before August 2022, stands at 313.9.

How do you integrate the Syntec Index into a contract?

To integrate the Syntec Index into a contract, a price adjustment clause must be included that specifies that prices will be periodically adjusted based on changes in the Syntec Index. The adjustment frequency 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 occur when there are significant reductions in salaries, social charges, or operating costs for 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, such as the Consumer Price Index (CPI) and the Producer Price Index (PPI), can be used to adjust contract prices. However, the Syntec Index is designed explicitly for intellectual services and is most relevant to 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 is your opinion on the Syntec Index’s evolution?

Tell us in the comments. THANKS.

September 2026 Syntec Index: Calculations, Trends, and Analysis