She uses AI to challenge her taxes: the court sanctions her with a fine

Marie-Line X wanted to contest her taxes: she ended up with a fine of 500 euros. The reason? An abusive appeal, but also a request “obviously written using an artificial intelligence tool”.

On December 4, 2025, Marie-Line In fact, the administrative court of Rennes (Ille-et-Vilaine) fined him 500 euros for abusive appeal, as reported by Franceinfo. Among all the elements which led to this fine, the court noted “a request clearly written using an artificial intelligence tool”.

Why did the court impose a fine of 500 euros on Marie-Line X? First of all, the Breton taxpayer had already filed a similar request, which was rejected. Then, she seized the Rennes administrative court without having previously sent a complaint to the tax administration, a mandatory step in this type of dispute. Marie-Line Last but not least, the court noted a lack of precision in its arguments.

Concerning this last point, the magistrate explains: “the means of the request – which moreover was clearly written using an artificial intelligence tool – are not accompanied by the most basic details allowing the judge to assess its scope and merits”.

The Rennes administrative court seems to have been somewhat annoyed by the fact that Marie-Line On the one hand, the use of AI would lead to a notable increase in legal requests. The court explains in this regard: “In a context marked by a particularly strong increase in the number of requests (…) before all administrative courts for two years, we are seeing the increasingly uninhibited use of artificial intelligence tools to generate “requests””.

On the other hand, AI would generate hollow queries, which lack details. The court explains that “in the eyes of many litigants, the requests “made by AI” have all the appearances on their side: legal vocabulary is used and the remarks appear structured”. However: “in the eyes of the legal professional, these requests often have a nasty flaw: they are hollow and full of misleading references”.

Ultimately, the Rennes administrative court mainly sanctioned the abusive nature of Marie-Line X's request, and the use of artificial intelligence clearly did not help it in this case. It seems that the court also wants to issue a warning to limit the number of requests developed using AI. The presidency of the court also invites Breton litigants to “use artificial intelligence tools with tact, discernment and moderation”. So be careful the next time you have to develop this type of request, even if, remember, the use of AI is not the only element that led to a fine in this case.

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Machine-translated from French