In New Zealand, property taxes are relative: the tax you pay depends on how much your property price rises relative to everybody else’s property prices. The local government has a fixed budget, which is apportioned between all the properties proportional to property values.

Example: a city has a budget of $1000. The city has two houses, one worth $100k and another worth $900k. The property taxes are $100 and $900 (ignoring fixed charges). If the houses double in value to $200k and $1800k, the property taxes are still $100 and $900.

It is important to keep this in mind when arguing about property price increases, because price increases don’t always matter.