Can I be Dutch and Turkish at the same time (dual citizenship)?
Yes, in two legal ways. First, you keep Turkish citizenship at naturalisation if an IND exception applies, for example you are married to or the registered partner of a Dutch citizen when your Royal Decree is signed (often the second spouse in a couple), or you were born in the Kingdom and live there. Second, you renounce Turkish citizenship after naturalising, then regain it under Turkish law (Law No. 5901, art. 13), and keep Dutch nationality because one of the exceptions in art. 15(2) of the Dutch Nationality Act applies on that day: you lived in Turkey for 5 consecutive years before turning 18, you are married to or the registered partner of a Turkish national, or you were born in Turkey and live there. Without such an exception, regaining Turkish citizenship makes you lose Dutch nationality.
Do I have to give up Turkish citizenship to become Dutch?
Usually yes, unless an IND exception applies, for example being married to or the registered partner of a Dutch citizen when your Royal Decree is signed, or being born in the Kingdom and living there. Turkish law lets the Ministry of Interior give you permission to renounce, but it is not automatic (Law No. 5901, art. 25). After you become Dutch, the IND sends a letter; within 3 months you send proof that you applied to renounce, and later proof that you lost Turkish citizenship. If you do not renounce, the IND can revoke your Dutch nationality.
How do I renounce Turkish citizenship from the Netherlands?
At the Turkish consulate, by appointment and in person. There are two steps: the first application for permission to renounce, and later the handing over of the permission or renunciation certificate. Under art. 25 of Law No. 5901 you must be an adult with capacity of discernment, have another nationality or show credible signs that you will get it, not be wanted for a crime or for military service, and have no financial or criminal restriction. The permission is valid for 2 years; within that time you must show the consulate that you got the other nationality, or it becomes invalid (art. 26). You lose Turkish citizenship when you sign for the renunciation certificate (art. 27). Ask the consulate for the current document list and fees.
Does Turkish military service block renunciation?
Under art. 25(c) of Law No. 5901 you can only get permission if you are not wanted for military service. Whether a deferral (tecil) is enough is decided by the Turkish authorities, so ask the consulate. On the Dutch side, you can ask the IND for an exemption from renouncing if you would first have to do or buy off military service; you must ask in your naturalisation application, and the IND decides.
What happens to my spouse and children?
Under art. 27(2) of Law No. 5901, one spouse losing Turkish citizenship by permission does not affect the other spouse. Children only lose it with the parent if the parent asks for it and the other parent agrees; if the other parent does not agree, a judge decides. Children never lose it if that would make them stateless (art. 27(3)). On the Dutch side, minors who naturalise with you do not have to renounce. A spouse who is married to a Dutch citizen when their own Royal Decree is signed can keep Turkish citizenship; if you naturalise together, confirm with the IND whether this applies.
What is the Blue Card (Mavi Kart) and what rights does it give?
Under art. 28 of Law No. 5901, people who were Turkish by birth and gave it up with permission (çıkma izni), and their descendants up to the third degree, keep the rights of Turkish citizens, with some exceptions: no right to vote or be elected, no duty-free import of a car or household goods, and no military service duty. Acquired social security rights stay. You cannot be a permanent civil servant, but you can work in the public sector as a worker, temporary staff or on contract. It does not apply if Turkish citizenship was taken from you, and descendants must prove the family link. You get the card on request; apply at the consulate by appointment. It is not the EU Blue Card work permit.
Can I take Turkish citizenship back without losing Dutch nationality?
Often yes. Turkish law lets people who lost Turkish citizenship by permission regain it by Ministry decision, without living in Turkey, if there is no national-security obstacle (Law No. 5901, art. 13). On the Dutch side, an adult who voluntarily takes another nationality loses Dutch nationality, unless one of three exceptions applies on the day you regain it: you were born in Turkey and live there, you lived in Turkey for 5 consecutive years before turning 18, or you are married to or the registered partner of a Turkish national (Dutch Nationality Act, art. 15(2)). You do not need IND permission when an exception applies, but keep proof, such as school records. Your minor children keep Dutch nationality as long as one parent is still Dutch (art. 16(2)(a)). Without an exception, the loss is automatic.
I may keep both nationalities. Do I report this to Turkey?
Under art. 44 of Law No. 5901, people who get another nationality can have it noted in the Turkish civil register after showing their documents. The consulate offers this as 'Çok Vatandaşlık Tescili'. Whether you must do it within a deadline is not in that article; ask the consulate.
Turkish nationals: when do I no longer need a work permit (TWV)?
Under the EU–Turkey Association Agreement, Turkish citizens no longer need a work permit (TWV) for paid employment after 3 years with the same employer, instead of the usual 5 years. The IND page lists a residence permit for paid employment under this agreement, with form 7531; it requires at least 1 year with the same employer. Check the conditions on the IND page for Turkish citizens.