How can you find out why there is a difference between the tax assessment and the taxx.lu result?

There may be a difference between the final result issued by the tax authority and the estimation provided by taxx.lu. In such cases, the tax authority usually adds an explanatory note at the bottom of the tax assessment, indicating the reason for the difference.

This information appears under the heading: « L’imposition diffère de la déclaration sur les points suivants »

If the tax authority has not provided an explanatory note, which is possible, you can, if you have selected a Plus or Premium package, contact taxx.lu at the following email address: help@taxx.lu.

We will then help you identify the source of this difference and, if necessary, assist you in drafting an appeal letter.

Updated on: 14/01/2026