Income tax Dates
If you think you'll get a large refund or debt at the end of the tax year, follow these steps to apply for a tailored tax code. This will help you pay the right amount of tax throughout the year.
Businesses and organisations cannot apply for this kind of tailored tax code.
Apply every year
You need to apply for a new tailored tax code every tax year (1 April to 31 March). If you already have one, we’ll send you a letter in early February reminding you to apply.
Before you start
You will need:
- information about your income
- your New Zealand Superannuation or Veteran's Pension number (if you have one).
In myIR, go to your income tax account
Then click on ‘More…’
Click on 'Tailored tax code application'
You’ll find this under ‘Manage account’.
Fill out the form
Make sure you’re applying for the right tax year. For example, the 2025 tax year is from 1 April 2024 to 31 March 2025.
Submit the form to us
Log in to myIR
You can also complete a Tailored tax code or tailored tax rate application - IR23BS form and send this to us by post.
What happens next
We'll send you a letter and certificate within 10 working days of receiving your application to let you know your tailored tax rate. If you have myIR, you will see a copy of your certificate there. This lets you know we have approved your application.
Please note that applications made during February and March may take longer than 10 working days.
You need to tell your payer what your tailored tax rate is. Do this by showing them your certificate.
If you have a tailored tax code for your New Zealand Superannuation or Veteran's Pension, we'll let Work and Income know.
Your responsibilities
You need to reapply for a tailored tax code every tax year you want one.
We’ll contact you through myIR, or send you a letter, in time for you to reapply.