Address

• What address should I indicate in the "Where do you currently live?" fields ?

  In the "Where do you currently live?" fields, indicate the address at which you currently live, i.e. at the time of filling in your tax return. If you have changed your address in 2023, you must press the "Add an address" button and insert your old address.Few readers

• What should I do if I have had several addresses during the year?

  If you have had several addresses during the year, it is important to mention this. In this case you can attach a document in which you explain in detail the changes of address during the year, specifying the different dates of occupation.Few readers

• What should I do if I have had several addresses during a tax year?

  On taxx.lu, in the ‘Personal data’ section, you can enter your current address as well as a previous address. If you have moved several times during the tax year, please create a document (for example, a Word file to be converted into a PDF or a PNG image) summarising all your addresses and the respective periods of occupation for the year in question. Once the document has been created, simply import it under ‘Other appendices’ in the ‘Attachments’ section. (https://storage.crisp.chat/usFew readers

File number (assigned by the ACD)

• Where can I find my Luxembourg file number (NIF)?

  The file number is assigned by the Tax Administration and does not change from one year to the next. You can find it on every correspondence from the Tax Administration (e.g., last year's tax statement) This is a 9 or 11-digit number. If it is your first tax return, you will not have this number yet. In that case, leave the field blank.Few readers

• Where do I enter my Luxembourg tax file number?

  The file number (if allocated) must be indicated in the ‘’Other‘’ category!Few readers

Tax identification number (NIF)

• Where can I find my tax identification number (tax ID / TIN)?

  Most EU Member States use Tax Identification Numbers (Tax ID) to identify taxpayers and simplify the administration of your national tax obligations. Here is a guide to help you find your tax identification number: For Luxembourg : The file number is assigned by the Tax Administration and does not change from one year to the next. You can find it on every correspondence from the Tax Administration (e.g., last year's tax statement) This is a 9 or 11-digit number. (https://storage.crPopular

• Where can I find my Belgian tax identification number (TIN)?

  The tax number can be found on the following documents: On the back of your Belgian identity card On the back of your Belgian social security card On the back of your residence permit and vehicle registration certificate for foreigners residing in BelgiumPopular

• Where can I find my tax identification number (TIN)? (Countries that do not border Luxembourg)

  The tax identification number (TIN) in countries that do not border Luxembourg can generally be found on the following documents, depending on the country: Spain: The Spanish NIF can usually be found on the ‘NIE’ (Identification number for foreigners), which may appear on official documents such as your foreigner's identity card or residence certificate. Italy: The Italian NIF, called Codice Fiscale, appears on various documents such as the electronic identity card, tax returSome readers

• Where can I find my French tax identification number (NIF)?

  The tax number can be found on the following documents: on your pre-filled French tax return, top left of the first page, with the online access number on your French tax notices (income tax, secondary residence tax, property tax) top left, under the heading ‘Your references’.Few readers

• Where can I find my German tax identification number (TIN)?

  The tax number can be found on the following documents: On your German tax notice:Few readers

• 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.Few readers

• What if I don't have a Luxembourg telephone number?

  If you do not have a Luxembourg telephone number, you can still enter your foreign number by adding the prefix.Few readers