Transformation auditor: when should you think about it?

Updated March 2026 - A transformation auditor comes into play when a company changes its legal form, especially when it becomes a company limited by shares. In many transactions, the issue is identified too late even though it directly affects the security of the conversion.

See also contribution auditor, SARL or SAS and SAS capital increase.

The transformation auditor helps secure the transaction by reviewing, within the applicable legal framework:

• ▸the value of the assets making up the company;
• ▸any special benefits that may exist;
• ▸the overall coherence of the transformation.

The issue is not only formal. The report helps protect the legal balance of the operation when governance, shareholder rights and valuation assumptions may change.

The practical reflex is fairly simple:

• ▸conversion into an SAS or another company limited by shares;
• ▸absence of a statutory auditor able to intervene within the required framework;
• ▸a transaction that strongly affects governance or shareholder rights.

That said, the analysis should never be entirely automatic. The exact need depends on the legal form of departure, the target form and the audit situation of the company.

Article L223-43 of the French Commercial Code makes it necessary to review the starting form, the target form and the existence of a statutory auditor. In other words, a SARL conversion should not be approached by reflex alone. The legal route has to be checked carefully.

Hayot Expertise insight: a successful conversion is not limited to the report itself. You also need to review tax effects, the social status of the manager, ongoing contracts and the new articles of association.

The points to secure most carefully are:

• ▸appointment of the auditor in good time;
• ▸consistency with the latest accounts;
• ▸proper availability of the report before the decision;
• ▸coherence of the new bylaws;
• ▸a well-secured shareholders' resolution process.

CTA : Secure your company conversion

In 2026, the transformation-auditor issue remains as much a matter of method as of law. The more structural the change, the earlier it should be prepared. Treated properly, it helps secure the whole legal and documentary chain of the transaction.

Planning a conversion into an SAS or another company limited by shares? Our firm can coordinate the accounting, legal and documentary aspects. Book an appointment with an expert

(Official sources: article L224-3 of the French Commercial Code, article L223-43 of the French Commercial Code, Entreprendre.Service-Public.fr on changing legal form)