When Is a Tax Invoice Required in Australia? The A$82.50 Rule [2026 Guide]

A GST-registered business in Australia is legally required to provide a tax invoice only when a customer asks for one and the sale is worth more than A$82.50 including GST, according to current 2026 Australian Taxation Office (ATO) guidance. Below that line, no tax invoice has to exist at all. Above it, the supplier has 28 days from the request to produce one, and a buyer’s ability to claim a GST credit depends on whether that document actually shows up. This guide covers exactly when the obligation is triggered, what a buyer can do when a supplier will not cooperate, and the handful of situations the rule does not cover.

When does a business have to provide a tax invoice?

A business only has to issue a tax invoice when two things are both true: a customer asks for one, and the sale is worth more than A$82.50, including GST. Neither condition alone is enough. A $500 sale where nobody asks for a tax invoice carries no legal obligation to produce one, and an $82.50-or-less sale carries no obligation even if the customer does ask.

That $82.50 line is not arbitrary. It is exactly $75.00 excluding GST plus 10% GST, which is why it shows up as an odd-looking figure in the ATO’s own guidance rather than a round number. Once a customer asks and the sale clears that line, the ATO starts a clock: the seller has 28 days to provide the tax invoice, not 28 days to decide whether to bother. Most small businesses sidestep the question entirely by generating a compliant invoice for every sale regardless of size, since it costs nothing extra and avoids the request-and-wait cycle altogether.

Figure 1: A tax invoice is a legal requirement only once a customer asks and the sale exceeds $82.50 including GST. Source: Australian Taxation Office, Tax invoices.

How long does a supplier have to provide a tax invoice once asked?

Twenty-eight days, counted from the date of the request, not the date of the original sale. If a customer buys something in January and does not ask for a tax invoice until June, the 28-day clock starts running in June, not January.

That deadline sits close to another ATO response window worth knowing: a business that crosses the $75,000 GST turnover threshold has 21 days to register for GST from the point it becomes aware, according to the ATO’s own worked example. Neither figure is long. Both assume the business is already tracking the trigger event, whether that is a customer’s request or a turnover threshold, closely enough to act inside a few weeks rather than find out after the fact. A supplier that misses the 28-day window has not committed some separate offense on the spot, but the buyer on the other end of that missed deadline may not be able to claim a GST credit for the purchase until a valid tax invoice actually turns up.

Figure 2: Two ATO response-window deadlines that sit close together: 21 days to register for GST after crossing the threshold, 28 days to produce a requested tax invoice. Source: Australian Taxation Office.

Do you need a tax invoice for a sale of $82.50 or less?

No. For any sale at or under A$82.50 including GST, the ATO does not require a tax invoice, regardless of whether the customer asks. Plenty of small businesses issue one anyway, since most invoicing software generates a compliant document by default and it keeps the seller’s own records complete, but there is no legal requirement to do so below that line.

This is a narrower question than what has to be on a tax invoice once one is required, which depends on whether the sale is under $1,000 (7 mandatory details) or $1,000 and over (an 8th, the buyer’s identity). Our full breakdown of Australian tax invoice requirements covers that content checklist in detail; this piece is only about the trigger for needing one at all. The two questions get confused constantly because they share the same $82.50 figure as a reference point, but one is about whether an obligation exists and the other is about what that obligation contains once it does.

What can you do if a supplier will not provide a tax invoice?

The answer depends entirely on how much you paid. For a purchase of $82.50 or less, this is a non-issue: the ATO’s own rules for claiming a GST credit accept a tax invoice, a cash register docket, a receipt, or an ordinary invoice for a purchase that size, and if the supplier cannot produce any of those, a diary entry recording the supplier’s name and ABN, the date, a description of what was purchased, and the amount paid is accepted in its place.

For a purchase over $82.50, the substitutes disappear. The ATO’s rule for claiming a GST credit on a purchase above that threshold is that the buyer holds a tax invoice from the supplier, and there is no listed fallback document if the supplier refuses or the 28-day window lapses without one arriving. That does not mean the credit is lost outright. GST credit claims carry a 4-year time limit, so a business that eventually gets the tax invoice, whether that takes a follow-up email or a formal dispute, can still claim the credit once it is in hand. What it does mean is that a business chasing a tax invoice on a purchase over $82.50 has real money sitting in limbo until that document exists, in a way a smaller purchase never does.

Figure 3: The ATO accepts four different document types toward a GST credit for a small purchase, but only one, a valid tax invoice, once the purchase price exceeds $82.50. Source: Australian Taxation Office, When you can claim a GST credit.

Figure 4: Tax invoice, receipt, and diary record all count toward a GST credit for a $82.50-or-less purchase; none of them substitute for a missing tax invoice above that line. Source: Australian Taxation Office.

Are there other situations where a tax invoice is not required?

A few. Sales that are GST-free, such as most basic food, or input-taxed, such as many financial supplies, do not carry a GST component and so do not need a tax invoice in the usual sense, though a mixed sale that combines taxable and non-taxable items still has to clearly separate the two. A seller who is not registered for GST cannot issue a tax invoice at all, because the ATO reserves that specific document and wording for GST-registered entities; that seller issues a standard invoice with no GST charged instead. For the full mechanics of what a compliant tax invoice needs to say, once one is actually required, see our step-by-step guide to writing an Australian tax invoice.

One more exception worth knowing exists on the issuing side rather than the requirement side: in specific arrangements, the buyer can issue the tax invoice instead of the seller, known as a recipient-created tax invoice. That requires both parties to be GST-registered and to agree in writing that the buyer will issue it and the seller will not, and only applies to the categories of goods and services the ATO has determined can be handled this way. It changes who produces the document, not whether one is required in the first place.

Figure 5: Even a stalled tax invoice request is not necessarily a lost cause: GST credit claims carry a 4-year time limit from the date the entitlement arose. Source: Australian Taxation Office.

Tax invoice requirement, at a glance

Scenario	Tax invoice required?	Deadline / threshold	What the buyer can use instead
Sale requested, more than A$82.50	Yes	28 days from the request	Nothing; the tax invoice itself is required to claim the GST credit
Sale requested, A$82.50 or less	No	Not applicable	Receipt, cash register docket, invoice, or a diary record
Sale never requested by the customer	No, either way	Not applicable	Whatever record the seller already issued
Seller not registered for GST	No, and cannot be called one	Not applicable	A standard invoice with no GST charged

The Bottom Line

The A$82.50 rule is really a rule about who has to move first and how fast. Under that line, nobody has to do anything extra, and the ATO gives buyers several fallback options for substantiating a GST credit anyway. Above it, the moment a customer asks, a 28-day clock starts, and the buyer’s ability to claim the GST credit tied to that purchase depends on a document actually changing hands within a reasonable time. For most businesses issuing far more invoices than they receive requests for tax invoices, the practical fix is simpler than tracking two different thresholds: generate a compliant invoice for every sale by default, so the request never has to happen at all. None of this matters much once an invoice is actually paid on time, either, and Australian invoices have their own separate problem there; see our data on Australian late-payment trends for how long businesses are actually waiting to get paid in 2026.

Frequently Asked Questions

When is a business legally required to provide a tax invoice in Australia?

Only when a customer asks for one and the sale is worth more than A$82.50 including GST, according to the Australian Taxation Office. Once asked, the supplier has 28 days to provide it. Below A$82.50, or if nobody asks, there is no legal requirement to issue one at all.

Do you need a tax invoice for a purchase of $82.50 or less?

No. The ATO does not require a tax invoice for sales of $82.50 or less including GST. To claim a GST credit on a purchase that small, a tax invoice, cash register docket, receipt, or ordinary invoice all work, and if none of those exist, a diary record with the supplier’s name, ABN, date, description, and amount is accepted instead.

Can you claim a GST credit without a tax invoice?

It depends on the amount. For purchases of $82.50 or less, yes, a receipt, docket, or diary record can substitute. For purchases over $82.50, the ATO’s own rule for claiming a GST credit requires having a tax invoice from the supplier. GST credit claims carry a 4-year time limit, so a credit is not necessarily lost if the tax invoice arrives late.

Can someone other than the supplier issue the tax invoice?

In specific cases, yes, through a recipient-created tax invoice (RCTI). Both parties must be registered for GST and agree in writing that the buyer, not the seller, will issue the tax invoice, and only for goods or services the ATO has determined can be invoiced this way.

Sources and References

1. Australian Taxation Office: Tax invoices (2026)
2. Australian Taxation Office: When you can claim a GST credit (2026)
3. Australian Taxation Office: When you cannot claim a GST credit (2024)
4. Australian Taxation Office: Registering for GST (2026)

Note: All figures verified as of August 2026.