Income tax Dates
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MAR 31Final date for ratio option provisional tax applications.
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APR 7End-of-year income tax and Working for Families bills are due if you have an extension of time to file your income tax return.
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MAY 7Provisional tax payments are due if you have a March balance date and use the standard, estimation or ratio options.
You'll need to send us an Imputation group maintenance form - IR475 form if:
- a company – including a Trans-Tasman imputation company – joins or leaves an existing imputation group
- there's a change to an imputation group's nominated company.
Gather your information
For each company or consolidated group you will need the:
- IRD number
- name of imputation group
- current imputation credit account (ICA) balance (if joining).
In myIR, select 'I want to...'
Select 'Send a message'
Select 'something else'
Write your message
Tell us you want to make imputation group changes, and attach your completed IR475 form.
Log in to myIR
You can also send us your form by mail to:
Inland Revenue
PO Box 39090
Wellington Mail Centre
Lower Hutt 5045
New Zealand
Last updated:
22 Oct 2025