What is the deadline for sending in my tax return?

Tax return 2025 :

You have until 31 December 2026 to submit your tax return or annual statement.

Important instructions:

• Please ensure that your tax return is actually received by your local tax office before this date.
• The postmark does not count: any postal submission after 31 December 2026 will be considered late, even if the mail was sent beforehand.
• For detailed instructions on how to submit your tax return, you can consult our guide here: How do I send my tax return in Luxembourg ?
• The address of your local tax office is shown at the top left of your tax return or can be consulted directly on taxx.lu.

For previous tax returns :

It is no longer possible to submit them unless you are obliged to do so!

Updated on: 20/03/2026