Source date: 2026-03-12
Contributions and social contributions
C3S Declaration: The reporting campaign is open Published on March 13, 2026 - Entreprendre Service Public / Directorate of Legal and Administrative Information (Prime Minister)
The social solidarity contribution of companies (C3S) must be declared and paid before May 15, 2026. It applies to companies (private or public) with a turnover exceeding 19 million euros excluding taxes.
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The C3S, which contributes to the financing of old-age insurance, is only due for companies existing as of January 1 of the year.
Companies subject to the C3S must complete their online declaration and payment on the site net-entreprises.fr. It is necessary to register on this site or verify your data if necessary.
The declaration can be pre-filled with the information provided to Urssaf during VAT declarations.
The collection of the C3S is managed by Urssaf Provence-Alpes-Côte d’Azur.
In case of late payment or declaration, the company will incur a penalty set at a maximum of 10% of the contribution due.
Where to turn in case of need?
For more information on the C3S, please consult our corresponding sheet.
It is also possible to contact Urssaf:
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by phone, Monday to Friday from 9 am to 5 pm, at 0 806 804 260 (non-premium call);
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by email by filling out the C3S form;
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by mail: Urssaf C3S - TSA 62101 69833 SAINT PRIEST CEDEX 9.
Online services and forms
See also
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C3S: Opening of the 2026 Reporting Campaign Net-entreprises.fr
Source: Service-Public professionals
