Under Tajik citizenship regulation, citizenship in Tajikistan may be acquired by birth; as a result of admission of citizenship; as a result of the restoration of citizenship; or by choosing the citizenship of the Republic of Tajikistan when changing the State Border of the Republic of Tajikistan.
Furthermore, in order to acquire Tajik citizenship foreign citizens and stateless persons must have permanently resided on the territory of the Republic of Tajikistan for five years, from the date of receipt of the residence permit until the day of applying for admission to the citizenship of the Republic of Tajikistan. Moreover, basic knowledge of the state language at the level of communication is required. Finally, the applicants must not be under criminal prosecution.
Acquiring dual citizenship is allowed under Tajik legislation, however Tajik law sets forth certain restrictions. Firstly, dual citizenship is determined under International Treaties signed by Tajikistan. Therefore, Tajik citizens who voluntary acquire the nationality of a foreign state with which Tajikistan does not have an agreement on dual citizenship, automatically lose their original citizenship. Moreover, Tajik citizen who has entered the military service in security agencies, justice bodies, law enforcement agencies or other state authorities in a foreign country, loses the nationality of the Republic of Tajikistan, unless otherwise provided in international treaties of Tajikistan.
It should be noted that at present the Republic of Tajikistan has a signed agreement with the Russian Federation on Regulation of Issues on Dual Citizenship dated September 7, 1995.