Ah, now that their “discussion document” is out, I see that the Key Government will not actually be charging NZers GST if they purchase online from offshore suppliers. They will not actually be charging NZers GST if they purchase online from offshore suppliers, because the Key Government proposes that offshore suppliers with markets in the hundreds of millions will be required to register and return GST to the NZ IRD. And they will need to do that just in order to make some sales to, at most, a few hundred eager NZers.
And who would bother?
Which means that goods you do still purchase online from offshore suppliers will either be confiscated, or not be purchased because they will be confiscated. Which makes this proposal the erection of a consumer tariff wall in the most distant consumer goods market on the planet, at the very time when the same government is talking up a free-trade agreement.