Why should I use taxx.lu if I have to fill everything in myself?

taxx.lu goes far beyond a simple form: it transforms a complex and risky task into a simple, safe, and optimized process, while allowing you to maximize your savings and gain valuable time. Here’s how:

1. Clear and comprehensive guidance

taxx.lu supports you at every step. Each field is explained with concrete examples and precise instructions so you know exactly what information to enter and how to do it correctly. Additionally, an integrated chat and email are available to ask any questions and get a quick response in case of doubt.

2. Automatic calculation of legal ceilings and limits

The platform calculates all legal ceilings and limits, which can sometimes be complex depending on your situation, age, or other criteria. This ensures compliance with the law and allows you to take full advantage of your tax rights without performing these complex calculations yourself.

3. Accurate calculation of tax results and verification of the tax assessment

taxx.lu performs all necessary calculations to determine your final tax and allows you to verify the result of the tax assessment received from the tax office. You know exactly if the calculated amount matches your real situation, providing maximum security and preventing costly errors.

4. Automatic import with Auto Scan

With Auto Scan, most of your tax documents (salary slips, bank certificates, insurance, etc.) can be imported directly. This greatly reduces input time and the risk of manual entry errors, even for the most complex documents.

5. Intelligent tax optimization

taxx.lu identifies all tax optimization opportunities tailored to your situation: unused deductions, maximized ceilings, etc. You can legally reduce your tax without needing advanced tax knowledge.

6. Data security and verification with Plus and Premium offers

For further assurance, the Plus and Premium offers provide full verification of your data and calculations by experts. taxx.lu alerts you in case of inconsistencies, guides you to correct errors, and ensures a reliable and optimized filing before official submission.

7. Automatic updates of tax legislation

Tax laws change every year. taxx.lu automatically integrates all legal updates, ceilings, and tax rates. You can always be confident that your calculations and optimizations comply with the latest legislation without having to search for updates yourself.

8. Secure archiving

All your documents and filings are securely and centrally stored, ready to view or download at any time. No more searching for your papers for the next filing or an audit.

9. Dynamic tracking of your declaration

If changes occur after entry (new documents, corrections), taxx.lu instantly updates your calculations and results, ensuring your declaration is always correct.

10. Full accessibility, without LuxTrust

taxx.lu is available on all your devices computer, tablet, or smartphone without LuxTrust. You can complete or review your declaration from anywhere, at any time, with maximum security and a simple interface.

11. Easy submission via MyGuichet (Form 100)

Once your declaration is completed, the final PDF can be sent directly via MyGuichet. You save time and can securely submit your declaration to the Luxembourg administration without manually re-entering your data.

Updated on: 02/01/2026