> ## 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).

# Is assimilation to resident status automatic, or do I need to apply for it?

You need to apply for assimilation to resident status every year in your tax return, by ticking the relevant box on page 3 of form 100.

**If you use** [**taxx.lu**](https://taxx.lu/)**, the system ticks the right box for you automatically**, based on your personal situation and the information you have entered.