Kiwibank and Ird can do it at any kiwibank or kiwi&postshop...
For Kiwibank, I suggest to sign up free up and fast forward account.
Free up~normal retail transaction, withdrawal money and online banking
*we can using the debit card withdraw money at countdown or petrol station.
Fast forward account~ like a saving account can earn interest.
For easy way to check the detail of your bank account, you may download the Kiwibank apps from apple store(iPhone) or play store(Android). Any online transfer you will need to using the apps too.
Ird~income tax in New Zealand, need prepare passport and international driving license. After fill up the form, need to waiting a week just can get the id number.
They will request the home address from you and post the ird letter to your home.
*Make sure and confirm the address you are staying.
*if you unable to collect the letter, you can call to Ird Department to get your Ird id.