Is it safe to upload your tax return to ChatGPT?

What is on a tax return or notice

• your tax identification number and the notice or reference number;
• names and dates of birth of everyone in the household: partner, children, dependants;
• every source of income, deductions, charitable gifts (which can reveal beliefs), and the tax due;
• the bank account used for refunds or direct debits, and your address.

What the AI needs to answer you

Tax questions depend on the country, the tax year, the box or line, the amounts and your situation in words ("married, two children, one rental property"). Identifiers and names do not change the rule that applies. Keep the figures you are asking about, tag the rest.

What can go wrong

Tax numbers combined with a name and address are what tax-refund scams and identity fraud look for. Turning off training does not remove the conversation: OpenAI explains that with "Improve the model for everyone" off, chats are not used for training but still appear in your history (OpenAI). In some countries, a tax number plus a notice reference is enough to look up a notice online, which is exactly why landlords ask for them.

A safe way to ask

1. Copy the lines you are asking about, or open the PDF, in Hide personal data before ChatGPT.
2. Tag your tax number, the notice reference, names, birth dates and bank details. Add your employer or landlord's name in "Also replace" if they appear.
3. Ask with the country and year: "For the 2025 French income tax, where do I declare this freelance income?"
4. Check the answer against the tax authority's own guidance before you file.

When not to use an AI at all

Do not let a chatbot fill in or submit your return on the official site, and never give it your tax account login. For a disputed assessment or a deadline you might miss, contact the tax office or an accountant: an AI can misstate rules that change every year.

Questions