Quick answer
In Australia, any tax invoice with a GST-inclusive total of $1,000 or more must include the buyer’s identity. The ATO accepts the buyer’s name, business name, address, or ABN — any one of these is enough. Below $1,000, you only need the 7 standard fields (we cover those in detail in our guide on what must be on a tax invoice).
Note: this is general information, not tax advice. The ATO website (ato.gov.au) is the authoritative source.
Why the $1,000 threshold exists
The $1,000 threshold exists for one practical reason: GST credit claims. When a business client pays your invoice, they claim a GST credit equal to 1/11th of the total. The ATO needs a way to match that claim back to a specific buyer so it can reject fraudulent claims and trace transactions during audits. Below $1,000 the audit risk is low and the paperwork is waived; above $1,000 the buyer needs to be on the document.
What counts as “buyer’s identity”?
You only need one of the following. You don’t need all of them.
- The buyer’s name — their legal name (e.g. “John Smith”).
- The buyer’s business name — the trading name of the business (e.g. “Smith Plumbing Pty Ltd”).
- The buyer’s address — a physical or postal address.
- The buyer’s ABN — the cleanest option for business clients because it uniquely identifies them in the Australian Business Register.
In practice, including both the business name and ABN for any business-to-business invoice is the safest move. For an invoice to a private individual, their name and email address is fine.
How to ask a client for their ABN (politely)
If you’re sending a $1,000+ invoice to a new business client and you don’t have their ABN on file, ask before you issue the invoice. Don’t make it weird; this is a routine compliance request every Australian business handles.
Subject: Quick details for your invoice Hi [Client name], I'm about to send through the invoice for [project / job]. Because the total is over $1,000, the ATO requires me to include your ABN (or business name and address) on the tax invoice. Could you send through: - Business name (as it should appear on the invoice) - ABN - Billing email (if different from this one) Once I have those I'll send the invoice today. Thanks, [Your name]
Most clients respond within a few hours. If they don’t have an ABN (e.g. an individual buying for personal use), their name and address is enough.
What if a client refuses to give their ABN?
You can still issue the invoice using their business name and address — the ATO treats any one of name/address/ABN as sufficient. If they refuse all three (rare), the document technically isn’t a valid tax invoice and they can’t claim a GST credit on it. Issue it anyway and they can chase you for a reissue if they want to claim.
One edge case: if the client refuses to provide an ABN and they are themselves a GST-registered business making the purchase for business purposes, you’re also required to consider the no-ABN withholding rule if they’re the one paying you and you don’t have your own ABN on the invoice. That’s a separate rule and works in the opposite direction.
Does the $1,000 threshold include GST?
Yes. The threshold is the GST-inclusive total. Worked examples:
- $900 subtotal + $90 GST = $990 total → below threshold, buyer ID not required.
- $950 subtotal + $95 GST = $1,045 total → above threshold, buyer ID required.
- $1,000 subtotal + $100 GST = $1,100 total → above threshold, buyer ID required.
How Free Invoice App handles it
Free Invoice App automatically prompts you for the buyer identity field the moment an invoice total crosses $1,000. If you’ve saved the client previously, it’s already there. If not, the prompt appears before you can mark the invoice as ready to send. You can’t accidentally send a non-compliant $1,000+ invoice.
Get started free on the Starter plan (7 sends/month) or see plans (Pro from A$5/month).
Frequently asked questions
What counts as “buyer’s identity”?
The ATO accepts the buyer’s name, business name, address, or ABN. Any one of these satisfies the rule. ABN is cleanest for B2B; name and address is fine for individuals.
What if a client refuses to provide their ABN?
You don’t strictly need their ABN — name and address also work. If they refuse all three, the invoice isn’t a valid tax invoice and they can’t claim a GST credit. Issue it anyway with whatever details you have.
Does the $1,000 threshold include GST?
Yes. The threshold is the GST-inclusive total. $950 + $95 GST = $1,045, which is over the threshold.
What if I forget to include buyer ID on a $1,000+ invoice?
The invoice isn’t a valid tax invoice and your client can’t claim a GST credit. The fix is to reissue with the buyer identity included.
Does the rule apply if I’m not GST-registered?
No. If you’re under the $75,000 GST threshold, you’re issuing a regular invoice, not a tax invoice, and this rule doesn’t apply. See how to invoice without GST registration for that situation.