Tax invoice requirements: what must be on an invoice

Why the requirements exist

A tax invoice is the evidence base of the whole GST system. Claim a GST credit on a purchase, and the tax invoice is what substantiates it. Miss a required element and the ATO can deny the credit, which is why a surprising amount of BAS risk lives in something as unglamorous as invoice formatting.

What a tax invoice must include

• The words tax invoice, stated clearly, usually as the document title
• The seller's identity, generally the business name
• The seller's ABN
• The date the invoice was issued
• A description of what was sold, including quantity and price
• The GST amount payable, shown separately, or a clear statement that the total price includes GST, where GST is exactly one eleventh of the total
• The extent each sale is taxable, where the invoice mixes taxable and non-taxable items

Above a certain value, the buyer's identity or ABN needs to appear too. The ATO sets that threshold, worth confirming on their site, but the practical habit is simpler than remembering a number: put the customer's name on every invoice, and the question never comes up.

Very small purchases sit under a threshold where a full tax invoice isn't required to claim the credit, though you'll still want some record of the expense. Again, check the ATO's current figure rather than assuming it hasn't moved.

Common ways invoices fail

Most failures are mundane. A quote or order confirmation gets waved through as an invoice. The ABN's missing because a template was copied from overseas software. GST isn't shown separately, and the total doesn't divide neatly into a GST component, leaving the amount ambiguous. Mixed supplies, an invoice combining GST-free items with taxable ones, show a single GST figure with no indication of which lines it actually applies to.

On the purchasing side, the risk flips. Get a document from a supplier with no ABN, and checking them on ABN Lookup takes ten seconds. Pay a supplier who can't quote an ABN, and you may need to withhold from the payment at the top rate. Not just a paperwork nicety, that one.

Recipient created tax invoices

In some industries the buyer issues the tax invoice instead of the seller, under a written agreement. Recipient created tax invoices turn up often in agriculture and similar arrangements where the buyer sets the value. They come with their own conditions, so if a customer proposes one, check it actually meets the ATO's requirements before relying on it.

Keeping invoices as records

Tax invoices are business records, and records generally need keeping for five years for tax purposes. Digital copies are fine, provided they're true, clear reproductions. Build a habit of photographing or forwarding every supplier invoice into your accounting system the moment it arrives, and the substantiation already exists the day a credit is claimed rather than the day it's demanded.

Where NextEra fits

Invoice compliance is trivial once it's systemised, and expensive the moment it's ignored. NextEra's managed monthly bookkeeping keeps supplier documentation attached to transactions and your own templates compliant, and a Strategic Finance Review will surface any gaps in how sales and purchase records currently flow into your file.