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 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 4

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. File size limits vary by subscription tier (unlimited for all tiers).

Question 5

What subscription tiers are available?

Accepted Answer

We offer four tiers: Free (schema validation only, unlimited validations), Standard (full validation with business rule issue counts), Professional (full validation with detailed error reports and analytics), and Enterprise (high-volume validation with priority support). See our Plans page for details.

Question 6

Do I need to create an account?

Accepted Answer

Yes. All subscription tiers (including the free tier) require a sign-in for security and quota management. Free tier: your files are validated with zero data retention. Paid tiers: files are securely validated on our EU servers, then permanently deleted immediately after.

Question 7

What's the difference between the Free and paid tiers?

Accepted Answer

Free tier provides schema validation only (structural correctness). Standard tier adds full validation with business rule issue counts. Professional and Enterprise tiers include comprehensive validation: schema validation, Luxembourg business rules, cross-reference integrity checks, detailed error categorisation with line numbers, and advanced analytics dashboards.

Question 8

How does billing work?

Accepted Answer

Payments are processed securely through an industry-leading payment provider. You can choose monthly or annual billing. Subscriptions auto-renew unless cancelled. You can manage your subscription, update payment methods, and download invoices from your Account page.

Question 9

What happens if I exceed my daily validation limit?

Accepted Answer

Each paid tier includes a daily validation quota. If you need more, some tiers allow purchasing validation credit batches that never expire. Credits are used automatically when your daily quota is exhausted. See our Plans page for details.

Question 10

Can I cancel my subscription?

Accepted Answer

Yes. You can cancel anytime from your Account page. Your subscription remains active until the end of your current billing period. No refunds are provided for partial months/years.

Question 11

What does the validator check?

Accepted Answer

Free tier: schema validation only (structural correctness). Standard tier: full validation showing business rule issue counts. Professional/Enterprise tiers: comprehensive validation including schema validation, Luxembourg-specific business rules (TVA rates, account types), reference integrity between master data and transactions, and data format validation (dates, currencies, numeric values).

Question 12

What do the different error types mean?

Accepted Answer

Errors are categorised 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 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

File size limits vary by tier. Free tier supports unlimited file sizes. Paid tiers support files up to their tier limit. For very large files, validation may take a few moments longer.

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

An internet connection is required to use the validator. The application loads in your browser and validation results are delivered instantly.

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 may take longer to process. If validation seems stuck, try refreshing the page and uploading again. If the issue persists, contact our support team.

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 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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