General questions about the tax return

• Who has to make a tax return in Luxembourg?

  Find out who needs to file a tax return in Luxembourg with our detailed guide.Featured

• What are the penalties for late filing of your tax return?

  Learn about the penalties for late filing of your tax return in Luxembourg with our clear and concise guide.Popular

• What is the difference between Form 100 and Form 163?

  Discover the difference between Form 100 and Form 163 with our clear and concise comparison guide.Popular

• How do I get a tax refund in Luxembourg ?

  Learn how to obtain a tax refund in Luxembourg with our step-by-step guide for a smooth process.Some readers

• How does taxation and withholding tax work in Luxembourg?

  Understand how taxation and withholding tax work in Luxembourg with our comprehensive guide.Some readers

• What are the consequences if I don't declare all my income?

  Discover the consequences of not declaring all your income on your Luxembourg tax return.Few readers

• How does withholding tax work in Luxembourg?

  Understand how withholding tax works in Luxembourg with taxx.lu.Few readers

• When can an annual statement (F163) be done ?

  Find out when an annual statement F163 can be done in Luxembourg with taxx.lu.Few readers

• Why does the final result differ from one year to the next?

  The final result of the tax return may differ from one year to the next due to changes in income, tax deductions and credits, tax laws and possible errors in the return. It is therefore important to calculate your tax correctly each year to avoid any problems with the tax authorities. The final result of the tax return may differ from one year to the next for several reasons: Changes in income: Income can vary from one year to the next depending on various factors such as salary increaseFew readers

• Is there double taxation in Luxembourg?

  Learn about double taxation in Luxembourg and how it may affect you.Few readers

• Can I claim a tax refund if I don't pay any tax on my income?

  If your taxable income is less than 11.450 €, then you pay no tax on your income and therefore cannot claim a tax refund. If you work as a European civil servant, too, as their salaries are not taxed. However, if you receive rental income, then a tax return is compulsory.Few readers

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Sending your tax return

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

  Discover how to transfer your Luxembourg tax return to MyGuichet.lu for Form F100 (not for F163) with our step-by-step guide.Featured

• How do I send my tax return in Luxembourg ?

  Learn how to send your tax return to the tax office in Luxembourg with our step-by-step guide.Featured

• What is the deadline for sending in my tax return?

  Learn the deadline for submitting your tax return in Luxembourg with our straightforward guide.Featured

• Is the tax return automatically sent to the tax office?

  No, unfortunately we cannot send the tax return automatically for you because you have to sign it. You must therefore send it by post or digitally (with an electronic signature on myguichet).Popular

• Which is my tax office?

  Learn how to find your tax office in Luxembourg with our simple guide.Some readers

• What penalty interest is applied on late payment?

  Learn about the penalty interest applied for late payments in Luxembourg with our informative guide.Some readers

• How do I send in my tax return (form 100)?

  You have several options. Myguichet : You can file it on myguichet. To do this, log in to your myguichet account and submit your Form 100 and the attachments. You can then sign directly on myguichet. By post : Check your tax return, print and sign it. You can then send the form and your attachments by post to the relevant tax office. The address of the relevant tax office is shown on the form (first page top left) and in the "Result" form on taxx.lu.Few readers

• How do I send in my annual statement (form 163) in Luxembourg ?

  Learn how to submit your annual statement Form 163 in Luxembourg.Few readers

• What should I do if I made a mistake on my tax return after it has been sent to the tax office ?

  If, after submitting your tax return, you realize that you have omitted certain details or declared an incorrect amount, you have the option to contact the tax officer at the tax office you are affiliated with, either by phone or by email, to explain the situation. Please follow this link if you are not sure which tax office you are affiliated with : https://taxx.lu/simulation/bureau-imposition As long as the return has not yet been processed and finalized by the tax office, the officer handliFew readers

• Can I submit my tax return late and/or for previous years?

  Find out if you can submit your tax return late or for previous years in Luxembourg.Few readers

• What is surcharge for late submission of the various returns?

  The surcharge for late submission of various returns is a charge imposed on the taxpayer or tax debtor in the event of non-compliance with tax return submission deadlines. It can amount to up to 10 % of the assessed tax. In the event of a late or inaccurate declaration of 1.000 € or more in terms of withholding tax on savings income, the paying agent incurs an automatic penalty of 0,5 % of the shortfall.Few readers

• What are the various additional charges applied if the declaration and payment deadlines are not met?

  In the event of non-compliance with the deadlines for submitting the various tax returns, the tax office may apply the following additional charges: The surcharge for late submission of the various returns. The penalty payment. The late payment interest. You can click on any of theFew readers

• Do I have to send in my tax return every year ?

  However, a taxpayer who is not legally required to submit a tax return in Luxembourg can choose not to do so from one year to the next. If a taxpayer voluntarily submits a return in a year when they are not required to do so, simply because it is advantageous for them, they are then included in the database of "regular" taxpayers. This database includes all taxpayers, whethFew readers

• What is the penalty payment?

  The penalty payment is a financial sanction imposed by the tax office for not submitting tax returns by the due date. The amount of the penalty depends on the severity of the delay and may be set after notification to the taxpayer or the tax debtor.Few readers

• How can I print out my tax return?

  Once you have completed your tax return on taxx.lu, you can print it out and send it to your tax office by post. As a first step, it is very important that you open your tax return with Adobe Acrobat Reader. On Mac: Click the printer icon (or cmd-P). Click on "Advanced". Tick the "Print As Image" check box. Click "OK" at the bottom right. On Windows: Press the printer icon (or CTRL-P).Few readers

• Do I need to stamp the tax return sent by mail?

  Yes, you must affix a stamp to your tax return if you send it in paper form.Few readers

• Why can’t I upload my 2024 tax return on MyGuichet.lu?

  The Luxembourg tax administration is currently experiencing technical issues with the processing of the official PDF form (Form 100). As a result, it is not possible to upload the tax return via MyGuichet.lu, regardless of the software used to generate the form. What can you do in the meantime? As long as the issue persists, we recommend that you print, sign, and send your tax return by post to your relevant tax office. As soon as the upload option on MyGuichet.lu is available again, weFew readers

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Tax statements and advances from Tax Authorities (Avis d'imposition & Décompte)

• When will I receive the tax statement of my tax return?

  Find out when you'll receive the tax statement for your return in Luxembourg with our helpful guide.Popular

• What does the tax authority's tax statement look like?

  See what the tax authority's tax statement looks like in Luxembourg with our detailed example.Some readers

• What are tax advances?

  Tax advances are quarterly advances that can be requested by Tax Authorities. If you are in this situation, enter the annual amount in field "I paid tax advances" in the "Other" Form. Most people do not have to pay tax advances, so if this is your situation, leave the box blank. This is NOT the amount of tax withheld on your salary certificate!Some readers

• What should I do if the result on taxx.lu differs from the tax statement received by Tax Authorities?

  If you have chosen our "Plus" or "Premium" packages, our services include verification of your tax assessment. To do this, please contact us by e-mail at help@taxx.lu and send us your tax statement in full. If you have chosen our "Standard" package, you have the option of upgrading to the "Plus" package so that our team can carry out a full verification of your tax return and tax assessment. What does the tax authority's tax statement look like? (/en/article/what-does-the-tax-authoritys-taxSome readers

• How do quarterly advances work?

  The quarterly advance tax payments work as follows: If a mandatory declaration leads to an adjustment of taxes for the previous year, the tax authority may require the taxpayer to make quarterly advance payments throughout the current year. These payments are due on March 10th, June 10th, September 10th, and December 10th, and represent one quarter of the previous year's tax adjustment. During a first tax adjustment, the taxpayer must pay the tax for the previous year as wFew readers

• What is the deadline for requesting a correction to the tax assessment ?

  Discover the deadline for requesting a correction to your tax assessment in Luxembourg with our clear guide.Few readers

• How can I receive my tax assessment electronically?

  Find out how to receive your tax assessment electronically in Luxembourg with our easy-to-follow instructions.Few readers