> ## 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.
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# What happens after submitting my tax return on MyGuichet?

Once your tax return is submitted on MyGuichet, it is forwarded to your **tax office**. The tax administration:

1. **Reviews** the information in your return.
2. **Adds comments** if additional information or documents are required.
3. **Finalises** the process once all checks are completed.

You will then receive by **postal mail**:
* **Your tax assessment notice**, showing the amount of tax to be paid or refunded.
* **The detailed tax calculation**.

The tax administration has a **legal period of up to 5 years** from the date your tax return is received to issue this notice.

**Important**: The amount to pay or be refunded is **not** displayed in the return or on MyGuichet, but only on the tax assessment notice sent by post.