Luxembourg law differentiates between paid and unpaid training, and the immigration requirements differ accordingly. Unremunerated training is generally defined as the obligatory professional training provided by an educational institution or company in Luxembourg in the context of a training course, or a continuing educational scheme organized and taught by a higher educational institution. The training must be of an educational nature and may not, in any case, be considered employment. Intragroup training conducted within companies of the same group is not considered as being an occupation equal to employment, and is therefore treated as unremunerated training.

Remunerated training is, on the other hand, considered equivalent to employment.