This article is from the New Zealand FAQ, by Phil Stuart-Jones and Lin Nah with numerous contributions by others.
Tipping is not expected in New Zealand, but is not unheard of. Employed
people don't depend on tips for their income and service charges are not
[usually] added to hotel and restaurant bills. Tip for service if you
think it's really deserved, but don't be surprised by the response. Some
(many?) consider tipping to be an undesirable practise.
 
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