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Have the appropriate documents ready. Fill in the application. Have it witnessed. Pay the fee. Send or walk the application in. Take the oath or affirmation.
You'll need your birth certificate, as well as your passport. The passport can be expired. You'll also need two passport photos of yourself. The photos must be identical, in color, and have been taken recently. The application can be found online. Pick the appropriate application, either by grant or descent. Once again, you'll need to fill in biographical information on you and your parents. You'll also need to answer questions about where you live, your residency status, and your fluency in English. You'll have another section about any criminal charges you may have faced. The application for by descent is slightly less complicated than by grant. You will need an adult to witness your signature of the application. A citizenship officer can be your witness. Whoever acts as the witness must also have a New Zealand passport. The person cannot live at the same address or be a relation. You have to pay fees to complete your application. As of 2016, those fees were about NZ$500 to complete the citizenship by grant application, though they are subject to change. For citizenship by descent, the application fee is about NZ$200. You also must pay a fee if your citizenship is denied. Once your application is completed, you can either send in your application by mail or make an appointment to go to one of the citizenship offices. The locations to walk the application in are in Wellington, Auckland, Christchurch, and Manukau. The addresses are on the online application. If you mail it in, make sure to use a "track and trace" courier bag. Mail the application to Department of Internal Affairs, PO Box 10680, Wellington 6143 You must take either an oath or affirmation to become a citizen by grant. Basically, you'll just stand up at a ceremony and say you pledge loyalty to New Zealand. The oath is religious (it includes "so help me God") while the affirmation is not. You also take the oath on a religious book.