When deciding on an application for a Beibehaltungsgenehmigung, public and private interests are weighed (§ 25 (2) p. 3 StAG), and it is a discretionary decision by the German Federal Administrative Office. If public or private interests can justify the retention permit and no overriding concerns stand in the way, the permit is granted. On the one hand, the public interest in avoiding multiple nationalities is considered. On the other hand, the private interest in establishing dual or multiple nationalities is also crucial to the decision.
The German Retention Permit applicant must provide the reasons for acquiring the new nationality. It must be possible to demonstrate credibly why the intended acquisition brings advantages in the specific case or leads to the avoidance or elimination of significant disadvantages. There is no exhaustive list of possible reasons. Instead, the applicant is very accessible in this respect. The advantages or disadvantages must be concrete. For example, aspects of inheritance, tax, or business law may be considered. Disadvantages in financing a course of study, impairments in career development or reasons in connection with family reunification are also possible. Furthermore, the applicant must present the reasons for retaining German citizenship similarly.
Finally, it is assumed that the other state allows dual or multiple citizenships<