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> 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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# How do I transfer my tax return to myguichet.lu? (Only F100 NOT for F163!)

###### A few clarifications before transfering your tax return to myguichet :

* You will need a [Luxtrust](https://www.luxtrust.com/fr/particuliers/commander-mon-produit) product to sign.
* Do not modify the tax return or change the name of the document.
* Please note! Form 163 (annual statement) cannot be send via myguichet.
* You must also submit the PDF containing all your documents (attachments) as well as any additional forms (F190, F700, F152...etc).
* At the end of the year, the submission process may be slower due to high traffic on MyGuichet. If you encounter difficulties, we advise you to try again a little later.

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### Instructions for signing and sending:

| First go to the [myguichet.lu](https://guichet.public.lu/en/citoyens/myguichet.html) website and click on "Log in". Then log in with your device and your login. 
| Click on "Services". 

![](https://storage.crisp.chat/users/helpdesk/website/-/1/c/5/f/1c5fc819171ffd00/screenshot-2026-04-09-at-11352_1k9z30q.png)


| Then add the PDF of the Form 100 that you have downloaded from taxx.lu. __Please note: Form 163 cannot be submitted on MyGuichet!__

![Upload PDF](https://storage.crisp.chat/users/helpdesk/website/-/1/c/5/f/1c5fc819171ffd00/screenshot-2026-01-05-at-15121_t0y26l.png)

| Then click on “Add an attachment” to add the PDF of your attachments downloaded from taxx.lu.
| If you need to add any other forms (F190/210, F121, F700...etc) add them by clicking on “Add an annex”. 
| Here's an example on how to do it : [How do I submit form 190/210 to MyGuichet.lu?](/en/article/how-do-i-submit-form-190210-to-myguichetlu-1pbn6s8/)

![Supporting document/annex](https://storage.crisp.chat/users/helpdesk/website/-/1/c/5/f/1c5fc819171ffd00/screenshot-2025-05-23-at-11145_183lgqi.png)

| Then click on "Sign" and follow the instructions on the site. 
| Your options:
| If you each have a myguichet account, send it once from each account (so that you end up with both signatures)
| Print out the last page of the tax return, sign it together and add it as an attachment directly to myguichet.
| Print out the last page of the tax return, sign it together and send it by post.

![Sign](https://storage.crisp.chat/users/helpdesk/website/1c5fc819171ffd00/microsoftteams-image-3_1jzmiw4.png)

| Finally click on "Send".  
| The tax office to which you must send it is indicated on the top left-hand corner of the first page of the tax return and on the ‘Result’ page on taxx.lu.
| You can also find your tax office here: [Find your tax office](https://taxx.lu/en/simulators/tax-office)

![Send](https://storage.crisp.chat/users/helpdesk/website/1c5fc819171ffd00/microsoftteams-image-4_pk332g.png)