To claim the GST back on a creditable acquisition, you must have a valid tax invoice from the supplier. There is an exception for individual items costing less than $75.

Generally, the tax invoice should contain the following:

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supplier’s name and ABN;
description of the goods or service purchased; and
the price including the GST paid.
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You must keep these invoices for 5 years from the time you lodge your BAS, and may need them for 5 years from the time you lodge your income tax return. The best way to maintain a record of your GST collected and paid, is by employing professional bookkeeping services.