What Makes a Valid Tax Invoice in Australia?
If you're registered for GST, a tax invoice is the piece of paper — or, more often these days, the PDF — that lets you claim back the GST you paid on a business purchase. But not every receipt is a valid tax invoice, and the ATO is specific about what one has to contain. Get it wrong and you can lose the GST credit on your BAS. This guide walks through exactly what a valid tax invoice must show, the A$82.50 rule that decides when you need one, and what to do if you lose one.
Why a valid tax invoice matters
When you're registered for GST, you can claim a GST credit (also called an input tax credit) for the GST included in things you buy for your business. That's real money back — a tenth of the GST-inclusive price on most purchases.
The catch is proof. To claim a GST credit for a purchase that costs more than A$82.50 including GST, you must hold a valid tax invoice from the supplier. If the ATO reviews your BAS and the invoice is missing or incomplete, the credit can be denied. So a valid tax invoice isn't red tape — it's what turns a purchase into a claim.
The A$82.50 rule
The threshold is worth committing to memory:
- More than A$82.50 (incl. GST): you must hold a valid tax invoice to claim the GST credit.
- A$82.50 or less (incl. GST): you don't need a full tax invoice. A simpler record — a cash-register docket, receipt or even a bank statement showing the supplier, date, what you bought and the GST — is enough to support the claim.
Why $82.50? It's $75 plus $7.50 of GST. It's a fixed figure set in the GST rules, so unlike annually reviewed rates (such as the cents-per-km car rate) it doesn't change each year. Even so, it's always worth confirming the current rules at ato.gov.au.
Either way, keep a record of every business purchase. The $82.50 line only changes what kind of record you need — not whether you need one.
What a valid tax invoice must show
The required details depend on whether the sale is under or over $1,000. Here's the breakdown:
| Detail | Under $1,000 | $1,000 or more |
|---|---|---|
| The words "tax invoice" | Required | Required |
| Seller's identity (business name) | Required | Required |
| Seller's ABN | Required | Required |
| Date the invoice was issued | Required | Required |
| Brief description of items sold | Required | Required |
| GST amount, or a statement like "Total price includes GST" | Required | Required |
| Buyer's identity or ABN | Not required | Required |
A few things worth spelling out:
- The document has to actually say "tax invoice" — a plain "invoice" or "receipt" heading technically doesn't meet the rule, though in practice the ATO looks at the substance of the document.
- The ABN is non-negotiable. If a supplier has no ABN and doesn't quote one, you generally can't treat their document as a valid tax invoice (and different withholding rules may apply).
- On the GST amount, the invoice can either state the GST separately (e.g. "GST $10.00") or carry a clear statement that the total price includes GST. Where only some items are taxable, the invoice should make clear which sales include GST.
- For sales of $1,000 or more, the buyer's identity or ABN must appear — so if you're the buyer, give the supplier your business name or ABN at the time.
If you'd like a refresher on how the GST itself works inside a price, see GST on business expenses.
What makes an invoice invalid
Common reasons a document falls short:
- No ABN shown for the seller.
- The words "tax invoice" are missing (a bare quote or order confirmation).
- No GST detail — neither a GST amount nor an "includes GST" statement.
- For a purchase of $1,000+, the buyer isn't identified.
- The copy is illegible — a faded thermal receipt you can no longer read.
That last one is more common than you'd think. Thermal EFTPOS receipts fade within months, so a photo or scan taken on the day is often more reliable than the original. The ATO accepts a clear digital copy as long as it's a true and readable reproduction — more on that in do you need paper receipts.
What to do if you lose a tax invoice
Losing one isn't the end of the claim, but you do need to act:
- Ask the supplier for a copy. Most businesses can reprint or re-email a tax invoice from their records. An emailed PDF is perfectly valid.
- Check your inboxes and apps. Many suppliers now send a tax invoice by email or through their own account portal.
- Use your digital copy. If you photographed or scanned the original before it went missing, that copy is acceptable.
- For purchases of $82.50 or less, you may not need the invoice at all — a receipt or bank record showing the supplier, date and GST can be enough.
If none of these turn up a valid tax invoice for a purchase over $82.50, you generally can't claim the GST credit for it. Which is the whole argument for capturing receipts the moment you get them, rather than hunting for them at BAS time.
Keeping your tax invoices BAS-ready
The simplest way to never lose a valid tax invoice is to digitise it straight away. When you snap a receipt with Snapceipt, it reads the supplier, date, total and GST and files a clear digital copy, so the record is built the moment you make the purchase — no shoebox, no faded thermal paper. Come BAS time, your GST-inclusive purchases are already captured and the credits are easy to total.
And if you're the one issuing invoices, the same details apply in reverse: your customers need a valid tax invoice from you to claim their credit. Snapceipt's quotes and invoices build compliant tax invoices — with your ABN, the GST and the right wording — so the documents you send hold up too.
This is general information, not tax advice — check ato.gov.au or a registered tax agent for your situation.