Syntec 2023 Index – latest values from 2021 to 2023

The revised Syntec index measures changes in the cost of services in the engineering, IT services, research and consulting recruitment, 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 has been published since September 2022, replacing the old Syntec index.

Syntec index values for 2023
Date of publication of the Syntec Index and evolution in 2023

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 value 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.

Syntec 2023 Index

Month & YearDate of publication (or expected date of publication)Revised Syntec IndexChange over 12 consecutive months in the revised indexChange / previous month of the revised indexOld Syntec indexValue to be used for contracts signed before August 2022 (revised index adjusted for the connection coefficient)Change over 12 consecutive months of the old Syntec indexVariation / previous month of the old Syntec index
December 2023 2024-01-31310.15.98%1.01%N/A303.85.99%1.01%
November 20232023-12-29307.05.90%0.10%300.85.91%0.10%
October 20232023-11-30306.75.98%0.23%300.55.99%0.23%
September 20232023-10-31306.06.55%0.10%299.86.54%0.10%
August 20232023-09-29305.76.74%0.30%299.56.74%0.30%
July 20232023-08-31304.86.65%0.26%298.66.50%0.26%
June 20232023-07-31304.06.78%0.43%297.86.37%0.43%
May 20232023-06-30302.76.36%0.36%296.65.92%0.26%
April 20232023-05-31301.96.38%0.40%295.85.71%0.40%
March 20232023-04-28300.75.66%0.74%294.65.26%0.74%
February 20232023-03-31298.55.55%1.57%292.55.12%1.57%
January 20232023-02-28293.94.29%0.44%287.93.77%0.44%
December 20222023-01-31292.64.24%0.93%286.73.39%0.95%
November 20222022-12-30289.93.42%0.17%284.02.56%0.18%
October 20222022-11-30289.43.36%0.77%283.52.46%0.75%
September 20222022-10-31287.22.57%0.28%281.41.77%0.29%
August 20222022-09-30286.42.36%0.21%280.61.48%0.07%
July 20222022-08-31285.82.33%0.39%
June 20222022-07-29284.72.37%0.04%
May 20222022-06-30284.62.71%0.28%
April 20222022-05-31283.82.49%-0.28%
March 20222022-04-29284.63.15%0.64%
February 20222022-03-31282.82.24%0.35%
January 20222022-02-28281.82.14%0.39%
December 20212022-01-31280.71.74%0.14%
November 20212021-12-31280.31.89%0.11%
October 20212021-11-30280.01.89%0.00%
September 20212021-10-29280.01.74%0.07%
August 20212021-09-30279.81.67%0.18%
July 20212021-08-31279.31.34%0.43%
June 20212021-07-30278.10.91%0.36%
May 20212021-06-30277.10.54%0.07%
April 20212021-05-31276.90.65%0.36%
March 20212021-04-30275.90.22%-0.25%274.60.0-0.25%-0.18%
February 20212021-03-31276.60.80%0.25%
January 20212021-02-26275.90.44%0.00%
Syntec index 2023

How to use the SYNTEC index?


The prices of the service contract may be revised at each contract expiration date according to a formula that integrates the evolution of the Syntec index. The reference index used will be that of November (example).

The formula for applying the Syntec 2023 index:

[New Price (P1)] = [Old Price (P0)] X [Known Reference Syntec Index (S1)] / [Reference Syntec Index (S0)] :

How to apply the Syntec Index to a price revision?
Syntec Index price revision formula


For price revisions on the first of January of each year, it is advisable for practical reasons to take the November or October Syntec index as a baseline. Indeed, the December index is only known at the end of the following January, which is late for the application of contractual price increases.

The values in this table will be updated as the index is published during the year 2023.

Syntec index update

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Specialist in finance and taxation from my professional activity and university formation, I share my knowledge and experience on the Juristique website. I regularly publish economic indexes such as SYNTEC index, BT01, ILAT, construction and rent reference indexes, and banking tools like SWIFT Codes or CNAPS Codes for international wire transfers.

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