Question 1

What is the Luxembourg FAIA Validator?

Accepted Answer

The Luxembourg FAIA Validator is an online tool that validates FAIA (Fichier d'Audit Informatisé AED) XML files against the official Luxembourg FAIA v2.01 schemas. It helps businesses ensure their electronic audit files comply with Luxembourg tax authority requirements before submission.

Question 2

What is FAIA?

Accepted Answer

FAIA (Fichier d'Audit Informatisé AED) is Luxembourg's standardized electronic audit file format required by the Administration de l'Enregistrement, des Domaines et de la TVA (AED) for tax compliance and audit purposes. Businesses must be able to generate FAIA-compliant XML files containing their accounting and transaction data when requested by tax authorities.

Question 3

Is this tool free to use?

Accepted Answer

Yes, the Luxembourg FAIA Validator is currently free to use during our beta period. No registration or account creation is required. Pricing may be introduced in the future as we add more features and exit beta.

Question 4

Is this an official government tool?

Accepted Answer

No. This validator is not affiliated with, endorsed by, or officially connected to the Luxembourg AED or any government authority. It is an independent tool that validates files against publicly available FAIA v2.01 XSD schemas. Validation results are for guidance only and do not guarantee acceptance by tax authorities.

Question 5

What file formats are supported?

Accepted Answer

The validator accepts XML files only. It supports all three official FAIA v2.01 schema variants: Full Version, Reduced Version A, and Reduced Version B. Maximum file size is 100 MB.

Question 6

Is my FAIA file uploaded to a server?

Accepted Answer

No. All validation happens locally in your browser using our proprietary validation engine. Your files never leave your device and are never transmitted to any server.

Question 7

Is the FAIA validator GDPR compliant?

Accepted Answer

Yes. Since no data is transmitted or stored, the validator is fully compliant with GDPR and other data protection regulations by design.

Question 8

Does the validator use cookies or tracking?

Accepted Answer

No. We don't use cookies, analytics, or any tracking technologies. Your usage is completely private and anonymous.

Question 9

Do I need to create an account?

Accepted Answer

No. No registration, no login, no email required. Simply visit the site and start validating your FAIA files immediately.

Question 10

What happens to my data after validation?

Accepted Answer

Nothing is stored. Your file is processed entirely in your browser's memory. When you close the browser tab or navigate away, all data is automatically cleared. We have no servers storing your data because we never receive it.

Question 11

What does the validator check?

Accepted Answer

The validator performs comprehensive checks including: XSD schema validation against official FAIA v2.01 schemas, Luxembourg-specific business rules (TVA rates, account types), reference integrity between MasterFiles and transactions, and data format validation (dates, currencies, numeric values).

Question 12

What do the different error types mean?

Accepted Answer

Errors are categorized into four types: Syntax errors (malformed XML), Structure errors (schema violations), Reference errors (missing cross-references between data), and Business Rule errors (Luxembourg-specific rule violations like invalid TVA rates).

Question 13

What is the difference between Critical, Important, and Warning errors?

Accepted Answer

Critical errors will cause your file to be rejected by the AED and must be fixed. Important errors should be fixed as they may cause processing issues. Warnings are recommendations that may improve data quality but won't necessarily cause rejection.

Question 14

Does a successful validation guarantee my file will be accepted by the AED?

Accepted Answer

No. A successful validation indicates your file passes schema validation and common business rules, but does not guarantee acceptance by tax authorities. The AED may have additional checks or requirements. Always verify your results independently and consult with tax professionals.

Question 15

Why does my file show errors even though my accounting software says it's valid?

Accepted Answer

Different validation tools may check different aspects of the file. Our validator checks against the official XSD schemas plus Luxembourg-specific business rules that may not be checked by your accounting software. The errors shown are based on official FAIA v2.01 specifications.

Question 16

What FAIA schema versions are supported?

Accepted Answer

The validator supports FAIA v2.01, which includes three variants: Full Version (complete reporting with all 12 MasterFiles tables), Reduced Version A (simplified for smaller businesses), and Reduced Version B (alternative reduced variant). This is the current official standard from the Luxembourg AED, unchanged since 2013.

Question 17

How large can my FAIA file be?

Accepted Answer

The validator accepts files up to 100 MB. For very large files, validation may take longer depending on your device's processing power. All processing happens in your browser, so performance depends on your local hardware.

Question 18

Can I validate multiple files at once?

Accepted Answer

Currently, the validator processes one file at a time. To validate multiple files, simply upload them one after another. Each validation is independent and previous results are cleared when you upload a new file.

Question 19

Does the validator work offline?

Accepted Answer

Once the page is loaded, the validation engine works entirely in your browser. However, you need an initial internet connection to load the application. For completely air-gapped environments, consider bookmarking the page after initial load.

Question 20

Which browsers are supported?

Accepted Answer

The validator works in all modern browsers including Chrome, Firefox, Safari, and Edge. We recommend using the latest version of your browser for optimal performance. Internet Explorer is not supported.

Question 21

The validator is not loading or shows a blank page

Accepted Answer

Try refreshing the page or clearing your browser cache. Ensure JavaScript is enabled in your browser settings. If the issue persists, try using a different browser or check if your browser is up to date.

Question 22

My file upload is failing

Accepted Answer

Ensure your file is a valid XML file with a .xml extension. Check that the file size is under 100 MB. If the file appears corrupted, try opening it in a text editor to verify it contains valid XML content.

Question 23

Validation is taking a very long time

Accepted Answer

Large files (over 10 MB) may take longer to process. The validation happens entirely in your browser, so processing speed depends on your device. Try closing other browser tabs to free up memory. If validation seems stuck, refresh the page and try again.

Question 24

I'm getting errors I don't understand

Accepted Answer

Each error includes a description and often a suggestion for fixing it. For XSD schema errors, check the line number indicated and compare with the official FAIA specification. For business rule errors, review Luxembourg-specific requirements. If you need help interpreting errors, consult with your tax advisor or accountant.

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