An elderly parent who is not computer-savvy, a partner absent for several weeks, a relative with a disability: the reasons for wanting to carry out an ANTS procedure on behalf of another person are common. The legal framework allows this practice, provided that certain specific rules are followed to protect the holder of the file.
Mandate and ANTS Power of Attorney: the distinction that avoids blockages
In practice, the most frequent confusion concerns the status of the third party involved. Acting for someone does not transfer either the ownership of the account or that of the file. The model is based on a mandate: the holder authorizes you to carry out a procedure on their behalf, but they remain the sole owner of the registration certificate, driver’s license, or any other requested document.
This mandate can take the form of a written power of attorney signed by the holder. It must mention the full identity of both parties, the nature of the authorized procedure, and its duration of validity. The holder retains the right to revoke this mandate at any time, without justification.
To understand how to create an ANTS account for another person on ANTS correctly, it is essential to keep in mind this clear separation between the account (technical access) and the file (the administrative procedure linked to the holder).
Login via FranceConnect: what it changes for multiple procedures
The ANTS platform offers two access modes: creating a classic ANTS identifier (email address and password) or authentication via FranceConnect. In practice, FranceConnect reduces the need to create a separate ANTS identifier since the holder logs in with their tax, Ameli, or La Poste credentials.
The problem arises when the assisted person does not have any of these accounts. In this case, one must revert to creating a classic ANTS account with the holder’s email address. Using your own email address for a third party’s account is a bad idea: the account will be linked to you, not to the holder of the vehicle or document.
FranceConnect+ and sensitive procedures
Some procedures related to digital identity are gradually transitioning to FranceConnect+, a strengthened authentication level. This planned escalation in 2026 could involve more ANTS formalities. For a third party acting with a power of attorney, this means that the holder’s presence may be required at the time of identity validation, even if the rest of the input is delegated.
Feedback on this point varies according to prefectures and types of procedures, but the trend is clear: the more the procedure relates to an identity document, the more personal authentication of the holder will be required.
Documents to gather before starting the online procedure
Before even opening the browser, gather the necessary documents. A missing document will block the online procedure and force you to start over.
- The valid identification document of the holder (national identity card or passport), scanned front and back in a readable format.
- A proof of residence less than six months old in the name of the holder (utility bill, tax notice, home insurance certificate).
- The power of attorney signed by the holder, accompanied by a copy of your own identification document as the agent.
- The vehicle registration certificate if the procedure concerns a change of holder, an addition of co-holder, or a correction on the registration document.
For vehicle procedures, also consider the transfer certificate if you are managing a sale, or the corresponding Cerfa form for the requested change. Each document must be in the name of the holder, not yours.
Concrete case: adding a co-holder on a registration certificate
Adding a co-holder on a registration certificate is one of the most common procedures carried out by a third party on ANTS. Typically, a couple wishes to register the vehicle in both names after a marriage or PACS, and one of them handles the online procedure.
The procedure is carried out from the main holder’s ANTS account. You enter the co-holder’s information (civil status, address if different) and attach the supporting documents. The co-holder does not need to create their own ANTS account for this operation, but they must be included in the power of attorney if a third party outside the couple is entering the information.
Regional tax and associated fees
Adding a co-holder triggers the issuance of a new registration certificate. Depending on the region, a tax may apply. Payment is made online by credit card at the time of file validation. The agent can pay with their own card; this does not affect the validity of the procedure.
Legal limits: what an agent cannot do on ANTS
The mandate allows for specific administrative actions, not unlimited access. Modifying the holder’s personal information (account email, password) without their explicit consent exceeds the scope of the power of attorney.
- Creating an account using a false identity or an email address that does not belong to the holder constitutes an offense.
- Signing electronically on behalf of the holder without written power of attorney exposes you to rejection of the file, or even prosecution.
- Accessing a third party’s ANTS account after the revocation of the mandate is considered unauthorized access to a data processing system.
The ANTS platform keeps a history of logins and actions taken on each file. In case of dispute, this history is authoritative.
Before you begin, ensure that the power of attorney precisely covers the intended procedure. A mandate written too vaguely (“all administrative procedures”) may be rejected by the administration. Specify the type of request, the registration number of the vehicle concerned if applicable, and the period during which the mandate is valid. This rigor protects both the holder and the agent.