The Tax Agency warns against using ChatGPT to file the 2025 Income Tax Return: “I wouldn’t take the risk.” The director general of the Tax Agency, Soledad Fernández, issued a clear warning to taxpayers on Wednesday ahead of the 2025 tax filing season: they should be wary of using external artificial intelligence tools like ChatGPT to prepare their tax returns.
“I wouldn’t risk doing it with ChatGPT,“ she stated emphatically, emphasizing that the agency has developed its own official assistance tools precisely to ensure the reliability of the process through Renta WEB and the official guide for the 2025 Income Tax Return.
Why AI models can fail in taxation
Generative artificial intelligence models like ChatGPT have significant limitations when applied to tax matters. First, in some models, their knowledge has a cutoff date and may not be up to date with the latest regulatory changes, regional deductions, or legislative updates for each filing season.
Furthermore, these systems do not have access to taxpayers’ personal tax data or to the Tax Agency’s draft returns, so any answers they provide are based on general information, not on each person’s specific situation.
Added to this is the risk of so-called “hallucinations, “ a phenomenon whereby these models can generate incorrect answers but present them with absolute certainty, which can lead to errors in deductions, tax brackets, or deadlines with real financial consequences for the taxpayer.
In light of these risks, the Tax Agency offers citizens the Renta WEB service, its own virtual assistant, and telephone and in-person support—tools specifically designed for each tax season and updated in accordance with current regulations.
Fernández insisted that the agency’s efforts to provide quality official assistance make it unnecessary to resort to external systems that cannot guarantee either the accuracy or the confidentiality of personal tax data.
