What happens at the end of the tax year

All Income tax dates

The tax year is from 1 April to 31 March. After the end of the tax year, we work out if:

We may have enough information to work out your tax for you, or you may need to file an Individual income tax return - IR3.

Pages in this section

Timelines at the end of the tax year Due dates for filing individual income tax returns and dates we process tax assessments and refunds.
When we work out your tax for you: income tax assessments
We’ll send you an income tax assessment if your only income is salary, wages or investment income that’s already taxed, like bank deposits or savings interest. This income tax assessment shows if you are due a refund, have a tax bill or have paid the right amount of tax.
Individual income tax return - IR3
There are a few reasons we will ask you to file a tax return. The most common reason is if you received more than $200 before tax that we have not been told about like rental or self-employed income, even if this was only for part of the tax year.
Completing an income tax assessment in myIR If we’ve asked you for more information or you need to change your income tax assessment, you may need to complete an income tax assessment in myIR. Use these links to instructions to help you complete your assessment.

Ka ahatia i te mutunga o te tau tāke What happens at the end of the tax year