Technical merger deficit (mali technique): how to understand it

Updated March 2026 - The technical merger deficit, often referred to in French as mali technique, mainly appears in certain merger transactions or equivalent restructuring schemes. It should not be confused with an ordinary economic loss or with a vague notion of deal overpayment. Its meaning is first and foremost accounting, transaction-driven and technical.

To complement this topic, also read Deferral of taxation on a share contribution, TUP: universal transfer of assets and liabilities and Business transfers.

• ▸it arises in certain merger structures;
• ▸it must be distinguished from the residual merger loss;
• ▸it can only be understood by going back to the original transaction;
• ▸the accounting follow-up has to be documented properly.

The term sounds like a loss, so it is often read too quickly as proof that the transaction destroyed value. That shortcut is misleading. In practice, the technical merger deficit needs to be interpreted in light of the merger mechanics, the valuation basis used and the way the assets and liabilities are recorded after the transaction.

In other words, the figure makes sense only when linked back to the structure of the operation.

Hayot Expertise insight: when reviewing a technical merger deficit, start from the merger scheme and the valuation logic, not from the final accounting line in isolation.

1. Reconstruct the transaction

You first need a clear view of the merger, TUP or equivalent reorganisation and of the entities involved.

2. Review the valuation logic

The accounting outcome cannot be understood without checking how the transferred items were valued and under which framework.

3. Distinguish the components

A technical merger deficit should be separated from other elements that may belong to a different accounting or economic rationale.

4. Document the follow-up

If the file is not documented, the accounting treatment quickly becomes fragile for future reviews, audits or restructurings.

We can help you review the entries, the valuation rationale and the broader accounting implications of the chosen structure.

Discover our accounting and legal support

In 2026, a technical merger deficit should be read as a matter of transaction structure, valuation and accounting treatment. Treating it as a simple abstract cost usually leads to the wrong diagnosis.

Need help reviewing the accounting logic of a merger or TUP? We can help frame the file and check the consistency of the treatment. Book an appointment with an expert

(Official sources: accounting regulations approved and published on Legifrance)