How to Write a Tax Invoice in Australia [2026 Guide]

Every Australian tax invoice for a sale under $1,000 needs 7 specific details, and that rises to 8 once the sale reaches $1,000 or more, according to the Australian Taxation Office (last updated August 2025). Get one of those details wrong and your customer can lose the GST credit they are entitled to claim, and you can end up on the wrong side of GST law yourself. Here is exactly what belongs on a compliant Australian tax invoice, in order, plus when the law actually requires you to issue one.

What must every tax invoice include? The 7 required details

For a taxable sale under $1,000, the ATO requires enough information on the invoice to clearly determine 7 things:

1. The document is intended to be a tax invoice.
2. The seller’s identity, meaning the business name.
3. The seller’s Australian business number (ABN).
4. The date the invoice was issued.
5. A brief description of what was sold, including the quantity if applicable and the price.
6. The GST amount payable, shown either as its own figure or, if it is exactly 1/11 of the total price, as the statement “Total price includes GST.”
7. The extent to which each sale on the invoice is a taxable sale, which matters most when an invoice mixes taxable and GST-free items.

Figure 1: The number of mandatory details jumps from 7 to 8 once a sale reaches $1,000. Source: Australian Taxation Office, Tax invoices (last updated August 2025).

Miss any one of the 7 and the document is not a valid tax invoice, even if every dollar figure on it is correct. That matters because your customer generally cannot claim a GST credit on a sale without holding a valid tax invoice for it.

What extra detail applies once a sale reaches $1,000?

Cross the $1,000 mark and an 8th requirement kicks in: the invoice must also show the buyer’s identity or ABN, on top of the original 7 details. The ATO’s own worked example of a $8,690 sale of window frames and deadlocks shows exactly this in practice: seller’s name and ABN, the buyer’s business name and address, a description and GST amount for each line item, and a total with “the total price includes GST” spelled out beneath it.

One practical shortcut is worth building into your habits from the start. If your invoice already meets every requirement for a $1,000-or-more sale, buyer identity included, you can use that same format for smaller sales too. Many small businesses standardize on the fuller 8-detail template for every invoice they send, rather than switching formats depending on the sale amount, just to avoid the risk of getting a bigger job wrong.

#	Required detail	Sales under $1,000	Sales of $1,000+
1	Marked “tax invoice”	Required	Required
2	Seller’s identity	Required	Required
3	Seller’s ABN	Required	Required
4	Date of issue	Required	Required
5	Description, quantity, price	Required	Required
6	GST amount, or “Total price includes GST”	Required	Required
7	Taxable extent of each sale	Required	Required
8	Buyer’s identity or ABN	Not required	Required

Table 1: All 7 details are required on every taxable sale; the 8th, buyer identity or ABN, only applies once a sale reaches $1,000. Source: Australian Taxation Office, Tax invoices.

What is a tax invoice, and does your business need to issue one at all?

A tax invoice is a specific legal document, not just any bill you send a customer, and only a business registered for GST is allowed to call it one. If your business is not registered for GST, the ATO requires you to issue a standard invoice instead, with no GST charged and none of the words “tax invoice” printed anywhere on it, according to the ATO’s guidance on setting up business invoices.

Whether you need to register for GST at all comes down to turnover, which the next section walks through, plus one narrow exception: taxi and ride-sourcing drivers must register for GST regardless of turnover, according to the ATO.

How do you calculate and show the GST amount?

Australia’s GST rate is 10%, which works out to exactly 1/11 of a GST-inclusive price. On a $100 sale that includes GST, $9.09 is GST and $90.91 is the price excluding GST.

Figure 2: The 1/11 rule applied to a $100 GST-inclusive sale. Source: Australian Taxation Office, Tax invoices.

Because that 1/11 relationship is fixed, the ATO gives you two valid ways to show it on an invoice: list the GST amount as its own line, or, if every taxable sale on the invoice carries GST at exactly 1/11 of its price, print the single statement “Total price includes GST” and skip a separate GST column entirely.

Rounding gets its own set of rules once fractions of a cent are involved. With one taxable sale on the invoice, round the GST to the nearest cent, rounding 0.5 cents up. With more than one taxable sale, you can apply either the total invoice rule (add up the GST-exclusive value of every taxable sale, calculate GST on that total, then round once) or the taxable sale rule (work out GST for each line item individually, then add and round the total). You and your customer are not required to use the same rounding method.

If an invoice mixes taxable items with GST-free or input-taxed ones, such as certain food, health, or education items, you have to clearly separate which lines are taxable and show the GST amount and total payable for those lines specifically. A generic “GST included” note across a mixed invoice is not enough on its own.

Do you have to register for GST before you can issue one?

Yes, and the ATO tracks this monthly, not just once a year. You reach the GST turnover threshold if either your current turnover, this month plus the previous 11, totals $75,000 or more, or your projected turnover for the current month plus the next 11 is likely to hit that mark.

The ATO’s own worked example makes the mechanics concrete: a sole trader named Barry sells specialized car parts, and at the end of May his current GST turnover, this month plus the previous 11, comes to $31,170, comfortably under the $75,000 threshold.

Figure 3: A business’s current GST turnover measured against the $75,000 compulsory registration threshold, using the ATO’s own worked example. Source: Australian Taxation Office, Registering for GST.

Barry still has to keep recalculating his projected turnover every month, and once that projection reaches $75,000 he has 21 days to register from that point, not from the end of the financial year. Skip registration once you are required to register, and you may end up owing GST on sales made from the date you should have registered, plus penalties and interest, even on sales where you never charged the customer GST in the first place.

Registering itself is straightforward once you know you need to: you need an ABN before you can register for GST, and from there registration can be done online, through a tax agent, or by phone. You only ever register once, even if you run more than one business, and you can cancel your registration later if your turnover drops back below the threshold and you no longer meet any of the other compulsory-registration triggers.

When are you legally required to issue a tax invoice?

Only when a customer asks, and only above a specific dollar threshold. If a customer requests a tax invoice, you must provide one within 28 days, unless the sale is $82.50 or less including GST, according to the ATO. That threshold applies per sale, not per customer relationship, so a single large order from a regular client still triggers the same 28-day obligation as a one-off sale from someone new.

Figure 4: A customer’s request starts a 28-day clock, unless the sale is $82.50 or less. Source: Australian Taxation Office, Tax invoices.

Below $82.50, or when nobody asks for one, a GST-registered business is not legally obligated to produce a tax invoice at all, though most issue a simple invoice or receipt as standard practice regardless. Sending an invoice you know is compliant the moment you send it, rather than scrambling to reconstruct one within a 28-day window, is the easier habit to build. A BillyPaid invoice generates the seller identity, ABN, date, description, and GST breakdown automatically on every invoice, so the 7 or 8 required details are already in place before you send it, rather than something to check after the fact.

What if you are not GST-registered, or someone else issues your tax invoice for you?

If your business is not registered for GST, your documents should be called invoices, not tax invoices, and should not charge GST at all. That distinction matters more than it might seem: printing “tax invoice” on a document from an unregistered business misrepresents the transaction and can create real confusion for a customer trying to claim a GST credit they are not entitled to.

There is also a reverse case worth knowing. In some industries, the buyer issues the tax invoice instead of the seller, called a recipient-created tax invoice (RCTI). An RCTI is only valid if both parties are GST-registered at the time it is issued, they have a written agreement permitting it, and the type of goods or services involved is covered by the ATO’s Recipient Created Tax Invoice Determination. The recipient then has to issue the RCTI to the supplier within 28 days of the sale, or of the date its value is determined, whichever is relevant. This arrangement is uncommon outside specific industries such as agriculture and government contracting, but it changes who is legally responsible for getting the invoice’s details right.

Getting Australian tax invoices consistently right sits alongside a separate, equally common problem for Australian small businesses: getting them paid on time once they are sent. That is a topic worth its own deep dive, along with the fuller set of ATO tax invoice requirements this guide draws from and a broader look at ready-made invoice template options, none of which this piece attempts to cover end to end.

Figure 5: Australia’s net GST cash collections grew 6.2% between FY2023-24 and FY2024-25, almost all of it flowing through GST-compliant tax invoices. Source: Australian Taxation Office, GST Administration Annual Performance Report 2024-25.

That $90.2 billion is a useful reminder of why the ATO enforces these 7 or 8 details so specifically: GST and VAT together generate a larger share of government revenue than any other single tax category across OECD countries, and every dollar of it depends on invoices that record the transaction correctly the first time. Chasing down invoices after they are overdue is its own well-documented problem for Australian, US, and UK small businesses alike, separate from whether the original invoice was compliant, but a business that gets the invoice right from the start at least removes one common reason a client stalls on paying it.

The Bottom Line

Writing a compliant Australian tax invoice comes down to a fixed checklist, not guesswork: 7 required details for any taxable sale under $1,000, an 8th for sales of $1,000 or more, GST shown either as its own figure or as the “Total price includes GST” statement, and a 28-day window to produce one if a customer asks for a sale over $82.50. Miss one of the required details and the document stops being a valid tax invoice, which puts your customer’s GST credit at risk along with your own compliance record. Building an invoice that already carries every required field by default, rather than checking a list after the fact, is the simplest way to make sure every tax invoice you send holds up.

Frequently Asked Questions

What 7 details does an Australian tax invoice need? For a taxable sale under $1,000, the ATO requires 7 details: a statement that the document is intended to be a tax invoice, the seller’s identity, the seller’s ABN, the date of issue, a brief description of what was sold including quantity and price, the GST amount payable (or a statement that the total price includes GST), and the extent to which each sale on the invoice is taxable. Sales of $1,000 or more need an 8th detail, the buyer’s identity or ABN.

Do I need to issue a tax invoice for every sale? Only if a customer asks for one and the sale is worth more than $82.50 including GST, according to the ATO. You then have 28 days to provide it. Below $82.50, or if nobody asks, GST-registered businesses do not have to issue a tax invoice, though many issue a simple receipt or invoice as good practice.

How do I calculate the GST amount on an invoice? GST is 10% of the price excluding GST, which works out to exactly 1/11 of the GST-inclusive total. On a $100 GST-inclusive sale, that is $9.09 GST and $90.91 excluding GST. If every taxable sale on the invoice carries GST at exactly 1/11 of its price, the ATO lets you skip a separate GST line and simply state “Total price includes GST” instead.

What is the difference between an invoice and a tax invoice in Australia? Only a business registered for GST can call a document a “tax invoice.” If your business is not registered for GST, the ATO requires you to issue a standard invoice with no GST charged and without using the words “tax invoice” anywhere on it. Registration becomes compulsory once your GST turnover reaches $75,000 ($150,000 for non-profits), and you then have 21 days to register.

Sources and References

1. Australian Taxation Office: Tax invoices (last updated August 2025), the 7 and 8-detail requirements, the $82.50 and $1,000 thresholds, GST rounding rules, and recipient-created tax invoices.
2. Australian Taxation Office: Setting up your business invoices (last updated March 2025), tax invoice vs standard invoice naming rules for GST-registered vs unregistered businesses.
3. Australian Taxation Office: Registering for GST (last updated May 2025), the $75,000 turnover threshold, the 21-day registration window, and Barry’s worked example.
4. Australian Taxation Office: GST Administration Annual Performance Report 2024-25, GST revenue performance, net GST cash collections of $90.2 billion, up 6.2% year over year.

Note: All figures verified as of October 2026.