On ANTS, the sharing of identifiers between individuals to “act on behalf of” often leads to confusion with the actual mechanism provided by the administration. The platform does not offer a delegation feature integrated into the user account. Any action for a third party relies on a specific documentary framework, structured around the mandate, the legal scope of which varies depending on whether it comes from an individual or an authorized professional.
ANTS Registration Mandate: Legal Scope and Document Limitations
The mandate used to act on behalf of a third party on ANTS is not a general power of attorney. It must be limited to a specific formality: change of holder, request for a duplicate, declaration of transfer. A mandate written in vague terms or covering multiple simultaneous procedures exposes the agent to a file rejection.
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The cerfa 13757 form governs this delegation for registration operations. It requires the handwritten signature of the principal, a copy of their identification document, and the specific designation of the agent. We observe that rejected files are mostly due to the absence of one of these three documents.
When you initiate a procedure on ANTS for another person, the agent uses their own ANTS account to submit the file, attaching the signed mandate and the principal’s supporting documents. The principal’s account itself is never shared or used by a third party.
This point radically distinguishes the process between individuals from that entrusted to an authorized professional, who has specific access to the Vehicle Registration System.
Authorized Professional or Individual Agent: Two Distinct Regimes on ANTS
An authorized professional (approved garage, online registration service provider) does not operate through the same channel as an individual. Their prefectural authorization grants them direct access to the SIV, with electronic submission of the file and tracking in a dedicated space. The registration mandate they collect follows a stricter documentary control process, with mandatory archiving.
For an individual acting on behalf of a relative, the procedure goes through the standard user account on ants.gouv.fr. The agent submits the digitized documents as if they were carrying out their own procedure, but by entering the principal’s information. The platform does not automatically indicate that it is an action for a third party: it is the mandate attached to the file that establishes legitimacy.
We recommend not to confuse these two pathways. Entrusting the procedure to an authorized professional eliminates the risk of data entry errors and speeds up processing, but incurs service fees. Acting oneself for a relative remains free (excluding registration taxes), provided one masters the file preparation.
What Happens if the Principal Cannot Sign the Mandate
Common guides assume that the principal is available and able to sign. The reality is more complex. Several situations block the signature: hospitalization, loss of cognitive autonomy, prolonged absence abroad.
Temporary or Physical Incapacity
If the principal is hospitalized but lucid, a handwritten signature on the cerfa is still required. No electronic signature is accepted for the registration mandate. The document can be brought to the principal for signature and then digitized. The administration refuses any mandate not signed by the principal.
Guardianship or Curatorship
When the principal is subject to a legal protection measure, the guardian or curator acts under the order of the guardianship judge, not under a simple cerfa mandate. The legal representative must attach a copy of the protection order to the ANTS file. The cerfa 13757 is not sufficient in this case.
Principal Abroad
A principal temporarily residing outside France can sign the mandate and send it by mail. A digitized copy of the signed document from abroad is accepted if accompanied by a legible copy of the identification document. No consular legalization is required for a standard registration mandate.
Preparing the ANTS File for a Third Party: Required Documents and Common Rejection Errors
The list of supporting documents varies depending on the procedure, but the core remains constant for any mandated action. Here are the elements systematically required:
- The signed mandate (cerfa 13757 for registration) with precise designation of the concerned procedure
- A valid double-sided copy of the principal’s identification document
- A copy of the agent’s identification document
- A proof of residence for the principal dated within the last six months
- The original registration certificate (or declaration of loss if applicable)
The most common reason for rejection remains the inconsistency between the name on the mandate and the name on the registration certificate. An undeclared change of civil status, a transcription error, or a different usage name from the birth name results in a systematic blockage.
Another point of caution: the proof of residence must be in the name of the principal, not the agent. Utility bills, tax notices, or accommodation certificates are accepted, but a rent receipt in the name of a roommate is not.
Co-holder on the Registration Certificate: A Case Distinct from the Mandate for Third Parties
Acting for a co-holder of the vehicle does not fall under the same logic. The co-holder is already listed on the registration certificate and has their own rights regarding the file. A co-holder can initiate certain procedures without a mandate, provided they are logged into their own ANTS account.
Confusion arises when a co-holder wishes to remove the other from the certificate, for example after a separation. This operation goes through the electronic procedure “Make another request,” section “Report a change in my personal situation.” The cerfa 13750 then replaces the 13757, and both parties must provide their respective documents.
Not mixing these two situations helps avoid rejection for an inappropriate form, an error we regularly observe in files prepared without assistance.
Regardless of the scenario, documentary traceability remains the guiding principle. Archiving a copy of the signed mandate, the transmitted documents, and the ANTS acknowledgment of receipt protects the agent in case of subsequent disputes regarding the completed procedure.