The glossary to understand and take action

Tax return

A tax return provides the administration with the information needed to assess or verify a tax for a given person and period.

Démarche et formalité · Luxembourg Fiduciaries Editorial Team · Reviewed on

Understand the scope

What is this process for?

Filing, payment and the tax assessment notice are separate steps. An acknowledgement of submission does not validate all declared treatments.

In your file

How to prepare the process

Preparing a tax return requires identifying the taxpayer, tax, period and data to be submitted. The accounts are often a starting point, but taxable profit may require adjustments. Preparation, validation, filing, retention of proof and any payment must be organised separately. When the firm prepares the file, responsibilities for transmitting documents and approving it must remain explicit.

A scenario to help you understand

Educational example

A company sends its accounts to its fiduciary firm but does not validate the prepared return. Providing the accounts does not prove tax filing: it requests the acknowledgement corresponding to the correct entity and period.

Fictitious situation, presented to illustrate the concept.

Prepare for what comes next

Points to check

  • Confirmer le formulaire et l’exercice
  • Rapprocher les chiffres des justificatifs
  • Conserver accusé de dépôt et preuve de paiement

The practical question

Find out more

Déposer une déclaration signifie-t-il que l’impôt est définitivement fixé ?

La déclaration fournit les informations servant à établir l’imposition. L’administration peut demander des justificatifs ou retenir un traitement différent. Conservez donc le calcul et les pièces après le dépôt. À réception d’un bulletin ou courrier, rapprochez-le de la déclaration, identifiez les écarts et examinez les voies et délais indiqués si une correction est nécessaire.

Connecting concepts

Terms to know as well

Continue with the concepts, contacts and procedures related to this topic.

Tax return — Form 500Form 500 refers to the tax return form for entities, with the sections and appendices corresponding to the relevant year and situation.VAT returnThe VAT return reports transactions and tax amounts to the AED according to the regime assigned to the taxable person.Tax advance paymentProvisional tax payment that is reconciled with the final tax assessment for the relevant period.Tax supportTax support organises the monitoring of obligations and analysis of the company's tax issues in accordance with the agreed engagement.Pillar 2 — effective minimum taxationPillar 2 establishes effective minimum taxation for groups within its scope, according to specific calculation and reporting rules.Direct Tax Administration (ACD)The Direct Tax Administration (ACD) is responsible for direct taxes falling within its remit.

Put it into practice

Explore further with our guides

Practical guideCorporate tax return: prepare the documents and monitor filing

Sources and verification

References consulted on 20 September 2026. Official procedures specify the applicable conditions and exceptions.

This guide explains a general process. The applicable rules depend on your situation; it does not constitute personalised advice. Report a correction.

A definition gives you a reference point. To examine your situation, clarify your question with a professional.