Luxembourg Tax & Business Advice – 2025 Tax Return Forms

12 May 2026 by

Frederic Themans

2025 Tax return forms are now available…

As of April 7, 2026, the tax return forms for the 2025 tax year are available via:

• MyGuichet.lu electronically.

Please ensure that you have the necessary means to sign your tax return digitally (LuxTrust or eID).

• Administration des contributions directes (impotsdirects.public.lu) for the printable version.

You can either complete the form directly on screen and then print it, or fill it in manually.

Supporting documents must be attached to your submission.

As a reminder, the tax return must be filed no later than December 31 after the closing of the tax year.

For more information on the procedure, please consult the official government websites.