However the site is a little confusing with links all over the place so here is a direct link to the French version of the form: click here

According to the statement by the government, the form can be completed and signed and may then be submitted electronically to the appropriate tax office, including appendices available on the website of the “Administration des contributions directes”. Supporting documents can be scanned in PDF format.

New for 2009

A new feature has been introduced in relation to the declaration for 2009, allowing users to import a certain amount of data related to their declaration into their "personal space" . This backup information will pre-populate other forms that may appear later, thus avoiding repeated data entry. To ensure the protection and confidentiality of transmitted data, the entire transaction over the internet is secured by LuxTrust, the certification authority in Luxembourg.

Guide to Completing your return

To guide the individual in their declaration, the portal www.guichet.lu at the same time, brings together tax and contribution information under the heading "IMPOTS / TAXES". The declarer can find very specific information necessary to complete their tax return.