The Luxembourg FAIA Validator checks yourFAIA tax audit files for errors before you submit them to the AED (Administration de l'enregistrement, des domaines et de la TVA). It verifies that your file meets the structural requirements, uses the correct Luxembourg tax codes, and contains consistent cross-references between your master data and transactions. Whether you are an accountant preparing client files, a finance director overseeing compliance, or a tax adviser reviewing submissions, the validator helps you catch problems early and avoid delays during an audit.
Key fact: Basic structural validation runs entirely on your computer. Your file is never uploaded to a server during this step. For deeper checks including business rules and cross-reference validation, files are transmitted securely and never stored.
Why Do Luxembourg Businesses Need FAIA Validation?
Luxembourg businesses subject to VAT must produce FAIA files when requested by the tax authorities during audits. These files contain sensitive financial data: your chart of accounts, customer and supplier records, invoices, and full transaction histories. Uploading such files to a third-party server for validation introduces unnecessary risk.
Existing validation options either require installing desktop software, lack coverage of Luxembourg-specific rules, or force you to upload confidential data to external services. The FAIA Validator removes these trade-offs by combining the convenience of a web-based tool with the privacy of keeping your data under your control.
How Does the Validator Protect Your Data?
When you use the validator for structural checks, your file never leaves your computer. The validation runs locally in your browser, with no data sent over the internet. This means:
- •Your financial data stays on your device throughout the process
- •The correct file format is detected automatically (Full, Reduced A, or Reduced B)
- •Results appear instantly, with no waiting for a server response
- •You can validate files even without an internet connection
For deeper validation including business rules and cross-reference checks, files are transmitted securely and never stored on our servers. Your data remains under your control at every stage.
What Does the FAIA Validator Check?
File Structure
The validator checks that your file follows the official FAIA format published by the Luxembourg tax authority. It detects which variant your file uses (Full, Reduced A, or Reduced B) and applies the correct set of rules automatically. This catches issues such as missing required fields, data in the wrong order, and formatting problems.
Luxembourg Tax Rules
Beyond the basic structure, the validator checks Luxembourg-specific requirements: correct TVA tax codes and rates (17%, 14%, 8%, and 3%), proper use of French accounting terminology (Actif, Passif, Produit, Charge), valid date formats, and correct decimal precision for monetary values and tax rates.
Cross-Reference Checks
Your FAIA file links transactions to master data records. The validator verifies that every account, customer, and supplier referenced in your invoices and journal entries actually exists in the master data section of the file. Missing references are one of the most common reasons files are queried during audits.
Clear Error Reports
Errors are classified by category (structure, tax rules, cross-references) and severity (critical, important, warning). The results dashboard provides visual summaries including charts and breakdowns so you can quickly see where the problems are and which ones to address first.
How Does It Compare to Other Validation Approaches?
Most approaches to FAIA validation have significant drawbacks:
- •Desktop software: Requires installation, often works only on Windows, difficult to keep updated, and no way to share results with colleagues easily
- •Upload-based web tools: Require you to send sensitive financial data to third-party servers, raising GDPR and data security concerns
- •Built-in accounting software checks: Only validate what their own system produces, miss cross-system issues, and typically do not cover AED-specific business rules
The FAIA Validator works on any device with a modern browser. It validates against the full range of AED requirements, not just the file structure, and provides clear error reports with specific guidance on how to fix each issue.
Who Benefits from FAIA Validation?
- •Accountants and auditors preparing FAIA files for client submissions to the AED
- •Tax consultants who need to verify FAIA compliance before advising on filings
- •CFOs and finance directors responsible for tax compliance at Luxembourg-based companies
- •Finance teams at multinational corporations with Luxembourg subsidiaries subject to AED audit requirements
- •Software vendors building or maintaining FAIA export features in accounting systems
How to Start Validating Your FAIA Files
Sign in and start checking your FAIA files in seconds. Structural validation is instant and runs entirely on your device. When you need deeper checks including business rules, cross-reference verification, and visual analytics, those features are available as well.