With respect to El Pinguino's research
, you have to read the whole Customs
working tariff document. There is a section covering the "small ships" he mentions, but a class of vessels otherwise dealt with includes vessels that are sailed to NZ by their owners, and that encompasses small craft up to superyachts (for which incidentally, temporary entry permits may now be granted for up to two years allowing cruisers to do major refits).
The concession stands: Duty and gst free if the owner has been offshore
for 21 months or more, brings back the goods as a resident and does not sell for two years. If the two year bond is broken duty and gst are payable on an assessed value which has a lot of variables. It is worth noting that if duty is payable Customs
have been thorough in the past in assessing not only the purchase price
of a boat, but also any added equipment
. Cruisers visiting NZ are well advised to keep all receipts and documents. I gather from a NZ citizen friend who sailed a US purchased boat to Australia
, where he lives, that the rules are similar there. Work he had done to prepare for the voyage was included in the assessment when he arrived in Oz.