Outsourcing payroll tasks to a third party, such as a specialized agency or an accountant, does not absolve the company from its legal responsibility for social contributions. When a company receives an observation letter or a formal notice from social security organizations, it is the employer that must respond and provide the necessary documents for the relevant periods. The use of a third-party declarant does not exempt the employer from fulfilling their obligations, and any attempt to avoid this through contractual clauses is null under the law. According to Article L133-11 of the Social Security Code, an employer can delegate certain social declaration tasks to a third party, but this delegation does not transfer legal responsibility for any failures in these declarations. The employer remains responsible for penalties and surcharges if there are omissions, inaccuracies, or failures to declare certain employees. The third party may perform the declarations, but the employer must still respond to any requests from the organizations. This means that even if a third party makes an error, the employer is ultimately liable. The legal framework also emphasizes that the responsibility of the employer is not solely based on a contract with the third-party declarant. The obligations remain legal in nature, not contractual. This distinction is important because it means that the employer cannot rely on a service provider to shield them from legal consequences. Additionally, the scope of the third-party declarant's role is defined by the services they are explicitly hired to perform. For example, providing software, configuring it, preparing payroll, and submitting declarations are distinct tasks that may be handled by different entities. When a company faces a claim for social contributions, the compensation is calculated item by item, rather than as a lump sum. This means that the company can only claim the specific amounts related to surcharges and penalties, and not the base contributions that would have been due regardless of the error. The court has ruled that, for example, the payment of a manager's social contributions does not constitute a recoverable damage if the accountant did not raise the issue. The company must also consider any financial advantage it may have derived from the delay in paying these contributions, which can reduce the amount it is entitled to claim.