I think in New Zealand (probably plenty of other places too), if you're a normal person earning a wage or salary and maybe some interest but nothing special goi

I think in New Zealand (probably plenty of other places too), if you're a normal person earning a wage or salary and maybe some interest but nothing special going on, you don't need to file a tax return at all. After all, a tax return is basically a means of correction at the end of the year. If everything is withheld correctly throughout the year, there is nothing to correct.