Reporting an Error in Your Tax Assessment

An error can sometimes occur in your tax assessment: incorrect personal information, calculation error, or data mix-up. You can report this error via a detailed letter to correct it quickly.

This page explains how to draft this report, what information to provide, and offers a ready-to-use letter template, plus a tool to automatically generate your personalized letter.

When should you write this letter?

• You noticed incorrect information in your notice (name, address, income);
• The calculated amount doesn't match your declaration;
• A reduction you're eligible for wasn't applied;
• You need to correct a simple spelling error.

In all these cases, a written letter remains a reliable way to correct your notice.

Required information to include

• Your first and last name and tax number;
• The reference of the notice concerned by the error;
• A precise description of the error observed;
• The correct information that should be registered.

The more detailed the report, the faster the correction.

Official letter template

Important note: the letter sent to the tax office must be written in French, as it is a French administration. Below is a template you can use as a basis.

[First name LAST NAME]
[Full address]
[Tax number]

Tax Office for Individuals of [City]
[Office address]

Written in [City], on [Date]

Subject: Reporting an error

Dear Sir/Madam,

I am reporting an error in my [year] tax assessment concerning [description of error].

[...]

→ The complete letter, tailored precisely to your situation and ready to send, is generated automatically in 3 minutes using the tool above.

Frequently Asked Questions

How do I check the accuracy of my notice?

You can compare it with your original return and verify each item carefully.

How long does correcting an error take?

Usually a few weeks after receiving your letter and supporting documents.

What if the error affected my tax amount?

The correct amount will be recalculated after correction, with any difference settled.

Can files really get mixed up?

Rare but possible, especially with similar names, advisable to report immediately if suspected.

Is this the same as a preliminary claim?

May overlap, but reporting a simple error is often simpler and faster than a full claim.