> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.taxx.lu/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# What should I do if I do not have a Luxembourg identification number?

If you do not have a Luxembourg registration number, leave the box empty.

If you do not yet have a tax identification number (tax ID / TIN), leave the field blank. You will receive your tax number once the tax office has processed your first tax return.