Observe · Regulate · Protect — since 2007. 19th OIMAP General Assembly: Singapore, 10–12 June 2026. Programme
Regulation

Reporting suspicious transactions

How, when and to whom to report a suspicious transaction: procedure, content of the report, protection of the reporter and follow-up.

Updated : October 28, 2026· 3 min read

Reporting, a duty that protects

The Calumny of Apelles, Giorgio Ghisi (1560)
The Calumny of Apelles, Giorgio Ghisi (1560)

When an operator has reason to suspect that a transaction is being used to launder money, they must report it to the competent authority. This duty comes with protection: a good-faith report cannot be held against them.

This page describes the situations in which a report must be made, the procedure to follow, the content of the report and what happens next.

It also recalls an essential rule: the client must never be informed of the report.

  • Report
  • Suspicion
  • Confidentiality

Reporting suspicious transactions in figures

1,940Reports in 2024
48 hRecommended time after finding
312Investigations opened
0Convictions of a good-faith reporter

Source: OIMAP Legal Affairs Department.

Breakdown

Auction houses42%
Galleries and dealers29%
Platforms18%
Other operators11%

Origin of reports.

When to report

A report must be made as soon as there is reasonable suspicion, that is, when a body of evidence suggests that the funds or the work come from an illicit activity. Proof is not required: the operator's role is to alert, not to investigate.

The report may be made before, during or after the transaction. Where the suspicion arises beforehand, the operator suspends the transaction pending the authority's instructions, where this is possible without alerting the client.

Leopard d'Or of Edward III of England  (1327–1377)
Leopard d'Or of Edward III of England (1327–1377)
Vanity Case (Nécessaire) (c. 1760)
Vanity Case (Nécessaire) (c. 1760)
Tetradrachm: Owl, Crescent Moon, Olive Branch (reverse) (480–449 BCE)
Tetradrachm: Owl, Crescent Moon, Olive Branch (reverse) (480–449 BCE)

How to report

The report is made by a form, available on the Desk portal, to be sent to the competent national authority, with a copy to OIMAP. It includes the operator's identity, the description of the transaction, the elements on which the suspicion is based and the attachments.

An acknowledgement of receipt is issued within forty-eight hours. The authority may ask for further information. The operator must not communicate with its client or with third parties about the existence of the report.

Protection of the reporter

The law protects the good-faith reporter: they cannot be prosecuted, civilly or criminally, for reporting a suspicion, even if it proves unfounded. Their identity is not disclosed to the client. Retaliation against an employee who has reported is prohibited.

This protection is essential for operators to dare to report. It comes with a requirement of good faith: an abusive report, intended to harm a competitor, may engage its author's liability.

Content of a report

Five headings
HeadingTo stateDocuments
OperatorIdentity and focal personArticles of association
TransactionNature, date, amountContract, invoice
PartiesIdentity and beneficial ownersIdentity documents
SuspicionFactual elementsNotes, exchanges
Follow-upMeasures takenSuspension decision

Landmarks

  1. Finding

    Suspicion formed.

  2. Report

    Filing of the form.

  3. Acknowledgement of receipt

    48-hour deadline.

  4. Follow-up

    Further information, investigation.

Never inform the client

Reporting or refusing a transaction

Dr. James Stuart; Mary Campbell Stuart, Gilbert Stuart (c. 1815)

Report

Informing the authority
  • Mandatory in case of suspicion
  • Protects the operator
  • Confidential

Always if suspicion.

Coin of Demetrios, I (reverse) (200–190 BCE)

Refusal

Decision not to conclude
  • May be sufficient if no suspicion
  • To be reasoned
  • May be accompanied by a report

Depending on the case.

Saucer with Scene in style of Watteau (c. 1750–60)
Saucer with Scene in style of Watteau (c. 1750–60)
Solidus of Justinian I (obverse) (c. 545–565)
Solidus of Justinian I (obverse) (c. 545–565)
The Antechamber of the Palace of Justice, Paris, Charles Meryon (1855)
The Antechamber of the Palace of Justice, Paris, Charles Meryon (1855)

Making a report

  1. Find

    Gather the elements.

  2. Qualify

    Assess the suspicion.

  3. Complete

    Complete the form.

  4. Transmit

    Send to the authority.

  5. Keep quiet

    Do not alert the client.

Good practices

An intelligence unit

American Red Cross War Council Medal (obverse), Daniel Chester French (1920)
« Good reports are short, factual and documented. We prefer one clear page to twenty confused ones. »
Inès Moreau, financial intelligence analyst

Vocabulary of reporting

Reasonable suspicion
Set of elements suggesting an offence.
Financial intelligence unit
Service responsible for receiving reports.
Disclosure
Information given to the client about the report.
Slip
Reporting form.

Frequently asked questions

Must I prove money laundering?

No, a well-founded suspicion is enough.

What happens next?

The authority may investigate, ask for further information or close the matter.

Can I continue with the transaction?

Only with the authority's agreement.

Where can I download the form?

In the useful documents on this page.

Useful documents

Contacts

The Apotheosis of Romulus: Design for a Ceiling, Domenico Maria Canuti (c. 1675–76)
The Apotheosis of Romulus: Design for a Ceiling, Domenico Maria Canuti (c. 1675–76)
Legal Affairs DepartmentParis — Headquarters+33 1 00 00 02 00juridique@oimap.exampleMonday to Friday, 9 am – 5 pm

See the sanctions

The Market Place, Wells, Muirhead Bone (1891–1953)

Penalties and measures incurred.

Sanctions
Image credits (16)
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