In order to work in New Zealand legally you will need to apply for an IRD number. An IRD Number is a unique number issued to you by the Inland Revenue, which allows you to work and pay taxes!
To apply for your IRD Number visit http://www.ird.govt.nz/.
In order to get your IRD number you will need to provide the following documentation:
Your IRD Number should take between 2 - 3 weeks to arrive. You do not have to wait for your IRD Number to arrive before starting any employment, once you have applied you will be given a temporary number.
Anyone holding a Working Holiday Visa is entitled to a tax return, so all or part of the tax they paid whilst working in New Zealand.
In order to apply for your tax return you need to:
You can contact the Inland Revenue on a freephone number (from within New Zealand): 0800 227 771 or from outside of New Zealand: +64 4 978 0779. The Inland Revenue is open from 8am - 8pm Monday to Friday and 9am - 1pm on a Saturday.
Alternatively you can find more New Zealand tax information at http://www.ird.govt.nz/.IR