イギリスの通販サイト(wiggle)で自転車を購入し、ニュージーランドへ発送してもら...

takasukedaさん

・関税（おおむね0%原産地による）のほかに、
・Goods and Services Tax (GST) of 12.5 percent（calculated on the duty-inclusive value plus international freight and insurance charges.）
・$24.75 (GST inclusive) ・A biosecurity risk screening levy of $12.50
が掛かるようです。
In addition, an import transaction fee of $24.75 (GST inclusive) may apply. This fee is payable at the time that your goods are cleared. A biosecurity risk screening levy of $12.50 is also collected by Customs on behalf of MAF Biosecurity New Zealand
http://www.customs.govt.nz/importers/Private+importers/Customs+char...

関税等の支払いについて
NZD＄のキャッシュかチェック（小切手）もしくは、クレジットカード（郵便での輸入）
Payment of Customs charges
Payments will only be accepted in New Zealand currency. Cash payment (which includes cash and cheques) is required for imports via air or sea. Personal cheques may only be accepted up to NZ$1,000.
MasterCard and VISA are accepted for imports made by private persons on goods for their own personal use via mail. Call 0800 388 437 to make a payment.
http://www.customs.govt.nz/importers/Private+importers/Customs+char...

クーリエ等（DHL、fedex、UPSなど）で輸入した場合、代理で通関支払っているかもしれませんので、請求書がクーリエから来ると思われます。＋立替支払い料などの手数料が掛かります。。。