Yes, the general rule is that you can claim back the GST on your purchase.
If you don't have an invoice, you'll still need to record the following:
- name and address of the supplier
- date of the purchase
- description of the goods
- quantity of goods
- price paid.
The only exception to this general rule is if you’re buying from someone associated to you. So if you buy a car from your brother and he’s not GST registered, you can only claim the lowest of:
- purchase price, or
- current market value, or
- GST component (if any) of the original cost of the goods to the supplier.
This is to prevent any tax shenanigans between mates or family!