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For NZ currency (and other currency, if reproduced in New Zealand), one-sided reproductions are allowed under criteria made public [1] by the RBNZ under Section 30 of the Reserve Bank of New Zealand Act 1989 subject [2] to the following conditions (paraphrased):

• For photographs, drawings, paintings, films and generally for any type of image in which the focus is not the bank notes/coins or reproductions themselves and which do not provide a close-up view of the bank note/coin designs;
• For one-sided reproductions, provided these are more than 125% or less than 75% of both the length and width (or coin diameter) of the respective bank note/coin, irrespective of the material used for the reproduction. Any materials used for coin reproduction must not be metal or metallic like.
  

Any other usage of them, on Wikipedia or elsewhere, may be copyright infringement. See RBNZ's reproduction criteria for more information.

Additional legal restrictions outside of copyright law including laws regarding counterfeiting may also apply, particularly when this image is used in printed form; RBNZ's reproduction criteria as mentioned above may apply.