If you make $180,000 a year living in New Zealand, you will be taxed $52,140. That means that your net pay will be $127,860 per year, or $10,655 per month. Your average tax rate is 29.0% and your marginal tax rate is 33.0%. This marginal tax rate means that your immediate additional income will be taxed at this rate. For instance, an increase of $100 in your salary will be taxed $33, hence, your net pay will only increase by $67.
A $1,000 bonus will generate an extra $670 of net incomes. A $5,000 bonus will generate an extra $3,350 of net incomes.
NOTE* Deductions are calculated based on the tables of New Zealand, income tax. For simplification purposes some variables (such as marital status and others) have been assumed. This document does not represent legal authority and shall be used for approximation purposes only.
NOTE** Voluntary deduction related to an employee who has joined a KiwiSaver scheme. As it is optional, it was not included in the withholding tax in the section above. The amount displayed is a potential employer contribution for an employee with a KiwiSaver scheme.