Tax invoice requirements in Australia: What every GST-registered business must include

Published Friday 24 July 2026

Table of contents

• What is a tax invoice in Australia?
• Tax invoice vs regular invoice vs receipt
• When must you issue a tax invoice?
• What must a tax invoice include?
• How do you manage records and corrections?
• Simplify GST invoicing with Xero
• FAQs on tax invoice requirements

Key takeaways

• GST-registered businesses must issue a tax invoice within 28 days of a customer's request for any taxable supply of $82.50 or more (including GST), with mandatory fields that vary depending on whether the sale is under or over $1,000.
• Invoices of $1,000 or more require all the same fields as smaller invoices, plus the buyer's identity or Australian Business Number (ABN).
• When an invoice includes both taxable and GST-free items, you must clearly mark which items attract GST and show the total GST amount separately so buyers can claim the correct input tax credit.
• All tax invoices and supporting documents must be kept for at least five years, and any errors on an issued invoice must be corrected by issuing an adjustment note that references the original invoice and updates your GST reporting.

What is a tax invoice in Australia?

A tax invoice is a specific type of invoice that GST-registered businesses in Australia must issue for taxable supplies so buyers can claim input tax credits on their purchases. It's not just a request for payment.It's a compliance document that satisfies Australian Taxation Office (ATO) requirements and enables your customers to claim back the GST they've paid you.

If you're registered for GST, you're legally required to issue a valid tax invoice when your customer asks for one, and you must do so within 28 days of their request. This applies to most sales of goods and services, excluding GST-free or input-taxed supplies like basic food, certain health services, and financial services.

The tax invoice serves three critical purposes: it formally requests payment, it provides proof of the transaction for your recordkeeping, and it allows your customer to claim the GST component as a credit against their own GST liability. Without a compliant tax invoice, your customer can't claim that credit, which means incorrect or missing invoices can damage your business relationships and expose you to compliance risk.

Understanding tax invoice requirements in Australia is essential whether you're invoicing other businesses or consumers. Even if your customer doesn't need to claim GST credits (for example, a non-registered consumer), you still need to issue a tax invoice if they request one and the sale meets the $82.50 threshold.

Tax invoice vs regular invoice vs receipt

Three different documents serve three different purposes in Australian business transactions. Knowing which one to issue, and when, keeps you compliant with ATO rules and helps your customers claim the right credits.

Purpose of each document

Each document type has a distinct legal function. Understanding the difference upfront saves you from issuing the wrong document, which can create compliance problems for both you and your customer.

• Tax invoice: a compliance document issued by a GST-registered supplier that requests payment and enables the buyer to claim a GST input tax credit
• Regular invoice: a payment request issued by a business that isn't registered for GST, or for a supply that isn't subject to GST
• Receipt: a confirmation that payment has been received, issued after the transaction is complete

Tax invoice vs regular invoice

A tax invoice and a regular invoice both request payment, but only a tax invoice satisfies ATO requirements for claiming GST credits. The distinction matters because issuing the wrong type of document, or labelling a regular invoice as a tax invoice, can expose you to ATO penalties and prevent your customer from claiming the credits they're entitled to. The key differences are:

• Who can issue one: only GST-registered businesses can issue a tax invoice; any business can issue a regular invoice
• What it shows: a tax invoice must display your Australian Business Number (ABN), the GST amount, and the words "tax invoice"; a regular invoice doesn't include these fields
• What it enables: a tax invoice lets your customer claim a GST input tax credit; a regular invoice doesn't

If you're not registered for GST, you must not label your invoices "tax invoice" or show a GST amount. Doing so is a serious compliance breach that can result in ATO penalties.

For more information, see this guide on how to register for GST in Australia.

Tax invoice vs receipt

A tax invoice is issued before or at the time of payment to request payment. A receipt is issued after payment to confirm it's been received. The two documents aren't interchangeable, with one exception: For purchases of $82.50 or less (including GST), a receipt that shows the supplier's name, the amount paid, the date, and what was purchased can substitute for a full tax invoice when claiming an input tax credit.

When must you issue a tax invoice?

You must issue a tax invoice within 28 days of a request from your customer for any taxable supply of $82.50 or more (including GST). This threshold is critical: Sales below $82.50 don't legally require a tax invoice, though many businesses issue them anyway as good practice and to maintain consistent records.

The 28-day rule starts from the date your customer asks for the invoice, not from the date of the sale. If you issue the invoice before they ask, you've already met the requirement. Most businesses send invoices immediately after completing the work or delivering goods, which means you're typically well within the timeframe.

Both electronic and paper tax invoices are valid under ATO tax invoice requirements. You can email a PDF, send it through accounting software, or print and post a hard copy; the format doesn't matter as long as the content meets ATO standards. Electronic invoicing is increasingly common because it's faster, easier to track, and integrates seamlessly with accounting systems.

Here's when you must issue a tax invoice:

• Sales of $82.50 (including GST) or more when the customer requests one
• Within 28 days of that request
• For any taxable supply (excluding GST-free or input-taxed items)
• To any customer, whether they're GST-registered or not

If you regularly supply the same customer, you can issue a single tax invoice covering multiple supplies over a period (up to 12 months), as long as it clearly identifies each supply and meets all other requirements. This is common for subscription services or ongoing contracts.

Issuing valid tax invoices on time helps you avoid penalties and ensures your customer can claim their GST credits. It also supports strong business relationships and smooth ATO reviews.

eInvoicing and electronic tax invoices

Electronic invoicing (eInvoicing) is the direct, automated exchange of invoice data between accounting systems using a standardised format. It's different from emailing a PDF. Instead of attaching a document, your system sends structured data directly to your customer's system via a secure network.

The ATO supports eInvoicing through the Peppol network, an international framework that lets businesses send and receive invoices digitally without manual data entry on either side. Electronic invoices issued through Peppol satisfy all ATO tax invoice requirements, provided the invoice data includes all mandatory fields.

You're not currently required to use eInvoicing unless you supply to certain government agencies, but the ATO actively encourages adoption. The practical benefits are significant:

• Faster payment: invoices arrive in your customer's system immediately, with no email delays or lost attachments
• Fewer errors: structured data reduces manual keying mistakes on both sides
• Automatic matching: your customer's system can match the invoice to a purchase order without manual intervention
• Full ATO compliance: eInvoices meet the same legal standard as paper or PDF invoices

If your accounting software supports Peppol-enabled eInvoicing, you can send compliant tax invoices directly from your system. Check whether your customer is registered on the Peppol network before sending, as both parties need to be connected for the exchange to work.

What must a tax invoice include?

The mandatory fields on a valid tax invoice depend on the total amount of the sale. The ATO has different requirements for invoices under $1,000 and those of $1,000 or more, and you must present GST tax invoice requirements clearly so the buyer can identify taxable and non-taxable items.

Invoices under $1,000

For sales under $1,000 (including GST), your tax invoice must include the following details:

• The words "tax invoice" prominently displayed (usually at the top)
• Your business name (the name under which you're registered for GST)
• Your Australian Business Number (ABN)
• The date you issued the invoice
• A brief description of each item sold (goods or services)
• The quantity or extent of each item (for example, hours, units, kilograms)
• The price for each item
• The GST amount (if any) for the sale, or a statement that the total price includes GST
• An indication of which items are taxable and which are GST-free or input-taxed

You don't need to show the buyer's name or ABN for invoices under $1,000, which simplifies invoicing for smaller transactions. However, you must make it clear how much GST is included. You can do this by showing the GST amount separately (for example, "GST: $45.45") or by stating "Total price includes GST" on the invoice.

Invoices of $1,000 or more

For sales of $1,000 or more (including GST), you must include everything required for smaller invoices, plus the buyer's identity or their ABN (usually their business name or individual name).

The buyer's details help the ATO verify that the correct parties are claiming and remitting GST. If your customer is a GST-registered business, including their ABN makes it easier for them to process the invoice and claim credits.

Mixed supplies and GST-free items

If your invoice includes both taxable and GST-free items (such as basic food, certain health services, or exports), you must clearly identify which items attract GST and which don't. You can do this by:

• marking taxable items with an asterisk or "T" and GST-free items with "GST-free" or "G"
• grouping taxable and GST-free items in separate sections
• showing the GST amount only for taxable items

Only charge GST on taxable supplies, not on GST-free supplies. Common GST-free items include basic groceries, most health and medical services, education courses, exports, and certain childcare services. If you're unsure whether an item is taxable or GST-free, check the ATO's GST food and beverage search tool or consult your accountant.

For mixed invoices, show the total GST amount separately so the buyer can see exactly how much GST they paid. For example:

• Subtotal (excl. GST): $500.00
• GST (10%): $50.00
• Total: $550.00

This format meets ATO requirements and makes it easy for your customer to reconcile the invoice with their records.

How do you manage records and corrections?

Keeping accurate records and fixing mistakes quickly are essential parts of meeting valid tax invoice ATO rules. The ATO requires you to retain invoices and supporting documents for at least five years, and you must issue adjustment notes if you need to correct an error.

When a receipt is enough

For purchases of $82.50 or less (including GST), a receipt with key details is usually sufficient evidence to claim an input tax credit. The receipt should show the following details:

• The supplier's name
• The amount paid (including GST)
• The date of purchase
• A description of what was bought

This threshold simplifies recordkeeping for small transactions like office supplies, fuel, or meals. You don't need a full tax invoice, but you should still keep the receipt for your records.

Fixing mistakes with adjustment notes

If you've issued a tax invoice and later discover an error, such as the wrong amount, incorrect GST calculation, or missing buyer details, you must issue an adjustment note that references the original invoice. The adjustment note should include the following:

• The words "adjustment note" at the top
• Your business name and ABN
• The date of the adjustment note
• A reference to the original tax invoice (invoice number and date)
• The reason for the adjustment
• The amount of the adjustment (increase or decrease)
• The GST amount being adjusted

Both you and your customer must update your GST reporting to reflect the adjustment. If the adjustment increases the GST you owe, report it in your next Business Activity Statement (BAS). If it decreases the GST, you can claim a credit.

See the ATO's guide to correcting GST errors.

How long to keep invoices

You must keep all tax invoices, receipts, and supporting documents for at least five years from the date you prepared or obtained them, or from the date you completed the transaction (whichever is later). This applies to both paper and digital records.

Digital storage is acceptable and often preferable; it's secure, searchable, and accessible from anywhere. Make sure your digital records are backed up and protected with strong passwords and multi-factor authentication to meet ATO security standards.

For more information, visit the ATO's GST records page.

Simplify GST invoicing with Xero

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FAQs on tax invoice requirements

Here are answers to common questions about ATO tax invoice requirements, thresholds, formats, and special invoicing scenarios to help you stay compliant.

Do I need to charge GST if my turnover is under $75,000?

If your annual turnover is below $75,000 (or $150,000 for non-profit organisations), you don't have to register for GST or issue tax invoices, although you can register voluntarily. Once you register, the standard tax invoice rules apply from your registration date.

Can I issue a tax invoice if I'm not registered for GST?

If you're not registered for GST, you can issue invoices, but you can't label them "tax invoice" or show GST amounts. If you later register, you can start issuing tax invoices from your registration date.

Can multiple documents together count as a valid tax invoice?

Yes, the ATO allows you to use multiple documents together to form a valid tax invoice, as long as the documents clearly relate to the same transaction and collectively contain all the required information. For example, a delivery docket and a payment receipt could together serve as a tax invoice if they show your ABN, the buyer's details (for invoices of $1,000 or more), descriptions, quantities, prices, and GST amounts. Using a single, clear tax invoice is simpler and reduces the risk of missing information.

What is a recipient-created tax invoice?

A recipient created tax invoice (RCTI) is a tax invoice created by the buyer (recipient) instead of the supplier. This arrangement is only allowed when both parties have a written agreement in place and both are registered for GST. RCTIs are common in industries like agriculture, where buyers need to process large volumes of purchases quickly. For more details, see the ATO's RCTI guidance.

Can I issue a tax invoice in a foreign currency?

Yes, you can issue a tax invoice in a foreign currency, but you must still calculate and show the GST amount in Australian dollars (AUD) at the time of the transaction. Use the exchange rate that applied on the date of supply to convert the foreign currency amount to AUD, then calculate the GST.