Calculating your GST

GST Dates

JUN 28

Your GST return and payment is due for the taxable period ending 31 May.
JUL 28

Your GST return and payment is due for the taxable period ending 30 June.
AUG 28

Your GST return and payment is due for the taxable period ending 31 July.

All GST dates

Most people file their GST return in myIR which does the calculations for you. If you file a paper return the form tells you what calculations to make.

Regardless of how you file you need to work out your total:

sales and income
zero-rated supplies
debit adjustments
purchases and expenses
credit adjustments

Sales and income

The way you work out your total sales and income depends on the accounting basis you use.

You use the invoice or hybrid basis	You use the payments basis
In your GST return for the period include: amounts you’ve notified customers to pay by invoice, even if you have not been paid yet the full sale price amount if customers have paid any amount before you’ve invoiced them.	In your GST return for the period include: amounts you've been paid by customers.

You use the invoice or hybrid basis

You use the payments basis

In your GST return for the period include:

amounts you’ve notified customers to pay by invoice, even if you have not been paid yet
the full sale price amount if customers have paid any amount before you’ve invoiced them.

In your GST return for the period include:

amounts you've been paid by customers.

Zero-rated supplies

Add up all your zero-rated supplies for the taxable period.

Zero-rated supplies

Debit adjustments

Add up all your debit adjustments for the taxable period.

Other GST debit adjustments

Purchases and expenses

The way you work out your total purchases and expenses depends on the accounting basis you use.

You use the invoice basis	You use the payments or hybrid basis
In your GST return for the period include: amounts you’ve paid to or been invoiced by suppliers if you hold taxable supply information, even if you have not paid the full amount yet.	In your GST return for the period include: amounts you've paid to suppliers if you hold taxable supply information.

You use the invoice basis

You use the payments or hybrid basis

In your GST return for the period include: