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C3S Optimisation

Reduce your French social solidarity levy on corporate turnover (Contribution Sociale de Solidarité des Sociétés).

Optimisation C3S

C3S Optimisation and Secure Reporting

The Contribution Sociale de Solidarité des Sociétés (C3S) is a French tax based on the annual turnover of companies generating over €19 million. While the rate is fixed (0.16%), the calculation basis is complex, prone to error, and can lead to significant overpayment, especially in low-margin sectors.

Every year, many companies overpay due to a lack of understanding of the applicable abatements, sector-specific exemptions, or available adjustments to the tax base.

Our tax experts help you identify, correct, and recover overpaid contributions while securing your future declarations.

Understanding C3S: Key Issues and Complexity

Annual Obligation

Who is liable? All companies with annual turnover exceeding €19 million (except those explicitly exempted by law)

Tax base: Annual turnover subject to French VAT (including taxable and exempt operations), after a standard €19 million deduction

Rate: 0.16% (with certain sector-specific adjustments or special regimes)

Deadline: May 15 of each calendar year via net-entreprises.fr

Tailored Support from BtoBnice

BTOBNICE offers a five-step C3S optimisation process, combining tax review, accounting analysis, and legal validation through a partnership with an independent law firm.

1. Compliance and Eligibility Assessment

  • Verification of C3S liability
  • Identification of applicable exemptions and favorable regimes

2. Tax Base Audit

  • Review of C3S-applicable financial flows
  • Exclusion of non-taxable operations
  • Integration of sector-specific deductions

3. Optimisation Strategy

  • Application of validated optimisation levers, in collaboration with our legal partner
  • Estimation of potential savings

4. Regularisation and Reclaim

  • Preparation of a legal claim file by our partner law firm
  • Administrative support in interactions with URSSAF Provence-Alpes-Côte d’Azur
  • Follow-up until full regularisation is obtained

5. Future Risk Mitigation and Continuous Support

  • Implementation of internal control procedures
  • Assistance with the current year’s declaration

Key Benefits of a C3S Optimisation Engagement

  • Cash recovery
  • Legal security: through our partner law firm
  • Timesaving: minimal disruption to your teams
  • Long-term tax reduction: by anticipating future risks
  • No results, no fee: success-based remuneration model (% of savings)

C3S Opportunity: Act Now

Retroactive claims: You may regularise your C3S over the past three years and unlock immediate cash flow.

Don’t let the C3S reduce your profitability!

📧 Contact BTOBNICE: contact@btobnice.com