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Practical guide to due diligence

The step-by-step method for carrying out due diligence: identity, provenance, lawfulness, payment and retention of evidence.

Updated : October 28, 2026· 3 min read

Six steps for a solid due diligence

Taj Mahal, Back View of the Rest-House, with Figure, Dr. John Murray (c. 1858–1862)
Taj Mahal, Back View of the Rest-House, with Figure, Dr. John Murray (c. 1858–1862)

This guide describes the method OIMAP recommends for carrying out due diligence. It is designed to be applied equally by a large auction house, an independent dealer or a collector reselling a work.

The method has six steps: qualify the risk, verify identity, establish provenance, check lawfulness, examine payment and decide. Each leaves a trace in a single file.

The following pages offer checklists and templates to put it into practice.

  • Guide
  • Method
  • Evidence

Practical guide to due diligence in figures

6Steps
12Points to check
30 minAverage duration of a basic due diligence
10 yearsFile retention

Source: OIMAP Legal Affairs Department.

Breakdown

Risk qualification10%
Identity of the parties20%
Provenance30%
Lawfulness and alerts20%
Payment15%
Decision and archiving5%

Time spent on each step for an enhanced-level due diligence (indicative).

The first three steps

First step: qualify the risk. The operator assesses the amount, the nature of the work, the geographical origin, the profile of the parties and the method of payment. This diagnosis determines the level of diligence (basic, enhanced or exceptional).

Second step: verify identity. This means making sure of the identity of the seller and the buyer, their capacity to act and, where applicable, the identity of the beneficial owner. Third step: establish provenance, that is, reconstruct as far as possible the chain of owners since the work was created.

The Triumph of Mordecai, Lucas van Leyden (1515)
The Triumph of Mordecai, Lucas van Leyden (1515)
Painting Enthusiasts at Auction House Bouillon, Honoré Daumier (1862, printed 1920)
Painting Enthusiasts at Auction House Bouillon, Honoré Daumier (1862, printed 1920)
Chemin de fer de Toulouse à Bayonne. Pont de l'Aran (en trois arches de 17m d'ouverture chacune). Situation des travaux au 21 juillet 1861, Édouard Baldus (1861)
Chemin de fer de Toulouse à Bayonne. Pont de l'Aran (en trois arches de 17m d'ouverture chacune). Situation des travaux au 21 juillet 1861, Édouard Baldus (1861)

The last three steps

Fourth step: check lawfulness. The operator consults the BIOP database, inventories of stolen property, lists of protected property and the legislation of the State of origin. Fifth step: examine payment: origin of funds, consistency with the client's profile, means used.

Sixth step: decide and archive. The operator concludes, refuses or asks for further information, then keeps the complete file. A decision to refuse must be reasoned, and may trigger a report.

Adapting the method to your size

A large auction house has a compliance department, computerised tools and networks of experts. An independent dealer does the same on a smaller scale, with a binder or a spreadsheet and a network of colleagues. What matters is that each step is carried out, dated and kept.

OIMAP offers simplified versions for small operators: a single two-page sheet covering the six basic steps is enough for low-value transactions.

Steps, tools and evidence

The six-step method
StepToolsEvidence to keep
1. RiskRisk gridQualification sheet
2. IdentityIdentity documents, registersCopies and extracts
3. ProvenanceCertificates, archives, cataloguesProvenance file
4. LawfulnessBIOP database, inventoriesDated capture of consultations
5. PaymentStatements, contractsProof of payment
6. DecisionSummary noteSigned decision

Landmarks

  1. Qualification

    Level of risk.

  2. Identity

    Collection of documents.

  3. Provenance

    Research and archives.

  4. Lawfulness

    Consultations.

  5. Payment and decision

    Final checks.

Warning signs

Documentary or field diligence

Compass and Sun Dial (1700–1750)

Documentary

Analysis of documents
  • Quick
  • Inexpensive
  • Sufficient for routine cases

Basic diligence.

Mercury (Budha), from a Mandi Astrology Series, Sanju (c. 1810)

Field

Visits, interviews, expert appraisals
  • Slower
  • More expensive
  • Necessary for sensitive cases

Enhanced diligence.

Creamer, Louis Rorimer (c. 1910)
Creamer, Louis Rorimer (c. 1910)
Carnet (1863–1865)
Carnet (1863–1865)
The Judgment of Midas, Nicolaes Clock (1589)
The Judgment of Midas, Nicolaes Clock (1589)

What to do in case of doubt

  1. Suspend

    Do not conclude.

  2. Supplement

    Ask for documents.

  3. Consult

    Take the opinion of an expert or the Department.

  4. Report

    Inform OIMAP if necessary.

  5. Decide

    Conclude or refuse, in writing.

Good practices

An auction house manager

Plaque (1500s–1600s)
« The day we formalised our due diligence, we discovered that we were already doing 80% of it: what was missing was the trace. »
Élise Moreau, auctioneer

Vocabulary of diligence

Beneficial owner
Person who actually controls a company.
Qualification sheet
Document assessing the level of risk.
Report
Information sent to the competent authority.
Due diligence file
All the evidence of a check.

Frequently asked questions

Who must carry out the due diligence?

The operator, under the responsibility of its manager.

Can it be outsourced?

Yes, but responsibility remains.

How long must records be kept?

Ten years.

Where can I find templates?

Useful documents

Contacts

The Grotto of Posillipo, Hubert Robert (c. 1769)
The Grotto of Posillipo, Hubert Robert (c. 1769)
Legal Affairs DepartmentParis — Headquarters+33 1 00 00 02 00juridique@oimap.exampleMonday to Friday, 9 am – 5 pm

See the checklists

Plate: Diana and Acteon, Maestro Giorgio Andreoli (1522)

The twelve points to check.

Checklists
Image credits (16)
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