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These instructions are for New Zealand resident companies, partnerships, superannuation schemes, Māori authorities, estates, trusts, clubs and societies that need an IRD number.

If your business or organisation is considered offshore (for example, because related parties are based overseas), you need to use a different process.

Offshore business or organisation IRD number application

Before you start

To apply for an IRD number you'll need to register a myIR account.

Register a myIR account for a business or organisation

Confirm your Business Industry Classification Code

You'll need your Business Industry Classification (BIC) Code if you're in business. Find your BIC Code on the Business Industry Classification Code website.

Business Industry Classification Code - businessdescription.co.nz

Get your documents

You'll need to get copies of documents before you apply for your IRD number. These can be PDF files. Find out what documents you'll need on the following page.

IRD numbers for businesses and organisations

Apply for your IRD number online

If you're applying for an estate IRD number, select the 'Trust' organisation type. Then you can select that it's an estate.

Log in to myIR

What happens next

  • We'll contact you if we need more information about your registration.
  • If you've applied online, we'll email your IRD number to you. If you've asked us to, we'll add your IRD number to your myIR account.
  • If you've completed a paper application, we'll email or post your IRD number to you. It can take 20 working days to arrive if you choose to have it posted.

Your responsibilities

  • Keep your IRD number where you can easily find it.
  • Tell us about any changes. The easiest way to update your details is in myIR. You can also send us a message in myIR and attach any required documents to it.

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Last updated: 11 Sep 2026
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