Business income tax: Filing returns
The due date of filing income tax return depends on the balance date of your business.
The balance date is the end of the accounting year. When you apply for an IRD number, your balance date is 31 March. If you want a different balance date, you need to apply to us in writing, stating the reason for the change.
You cannot use a different balance date until you have received written approval from us.
Due dates for tax returns
- For a balance date between 1 October and 31 March (inclusive), the due date of filing your income tax return is 7 July. This is the due date for most businesses.
- For a balance date between 1 April and 30 September (inclusive), the due date of filing your income tax return is the 7th day of the fourth month after your balance date.
- If a tax agent completes your return there may be an extension of time for filing it - your agent will be able to confirm this for you.
You can generate a list of all the due dates that apply to you with the Tax Due Date Calculator on our home page.
Date published: 14 Oct 2004