Invoicing Compliance Guide
Creating an invoice correctly isn’t just good bookkeeping — it’s a legal requirement if you operate a business in Australia. Invoices that don’t meet Australian Taxation Office (ATO) requirements can cause problems with GST claims, BAS reporting, and even payment delays from customers.
This guide explains exactly how to create a compliant sales invoice, whether you are registered for GST or not, and whether the invoice amount is under or over $1,000.
What Is a Compliant Sales Invoice?
A compliant sales invoice is a document that clearly records a sale and includes the information required under Australian tax law. The required details vary depending on:
- Whether you are registered for GST
- The value of the invoice
- Whether the customer needs to claim GST
Correct invoices protect both you and your customer, ensure smoother payments, and prevent ATO compliance issues.
This guide explains exactly how to create a compliant sales invoice, whether you are registered for GST or not, and whether the invoice amount is under or over $1,000.
How to Create an Invoice Under $1,000
For invoices less than $1,000 (including GST), your invoice must include the following:
- Your business name
- Your Australian Business Number (ABN)
- A unique invoice number
- The date the invoice was issued
- A clear description of the goods or services provided
- The total amount payable
- Whether GST is included or not
- Accepted payment methods (bank transfer, card, etc.)
GST wording requirements
If the invoice includes GST, it must clearly state: “Total price includes GST.”
Registered vs Not Registered for GST (Critical Difference)
If you are registered for GST
- Your invoice must say “Tax Invoice”
- You must show GST correctly
- Customers registered for GST rely on your invoice to claim credits
If you are not registered for GST
- Do NOT use the words “Tax Invoice” just plain Invoice
- No GST is charged
- The invoice is not a taxable supply
- These invoices are excluded from BAS GST reporting
This distinction is one of the most common invoicing mistakes we see.
How to Create an Invoice Over $1,000
For invoices greater than $1,000 (including GST), additional details are legally required.
You must include everything listed above, plus:
- The buyer’s identity or ABN
- GST shown per line item, not just as a total
Important Invoice Terms to Include (Best Practice)
While not always mandatory, these items protect your business legally and financially.
Credit Terms
Clearly state when payment is due, for example: “Payment due within 7 days of invoice date”
Charging Interest on Late Payments
If you intend to charge interest, you must disclose this before providing services. Your terms should state:
- Interest will be charged on overdue payments
- The interest rate is fair and reasonable
- The due date
- When interest starts accruing
Example wording:
All accounts are payable in full within seven (7) days of the date of issue. Interest may be charged on overdue amounts at the rate set by the Supreme Court of NSW or Australia at the time payment becomes overdue.
When a Tax Invoice Is Required
If you are registered for GST and make a sale of more than $82.50 (including GST), a GST-registered customer must receive a tax invoice to claim the GST credit.
Failing to issue a valid tax invoice can delay payments and cause disputes.
Frequently Asked Questions
Do I need to issue a tax invoice if I’m not registered for GST?
No. If you are not registered for GST, you must not issue a tax invoice or charge GST. Your invoice should simply be labelled “Invoice” and must clearly show that no GST has been applied.
What makes an invoice ATO compliant in Australia?
An ATO-compliant invoice includes your business name and ABN, a unique invoice number, invoice date, description of goods or services, the total amount payable, and correct GST wording if you are registered for GST. Additional details are required for invoices over $1,000.
When is a tax invoice legally required?
If you are registered for GST and make a sale of more than $82.50 (including GST), a GST-registered customer is entitled to receive a tax invoice to claim the GST credit.
Do invoices over $1,000 have extra requirements?
Yes. Invoices over $1,000 must include the buyer’s identity or ABN and show the GST amount for each line item, not just as a total.
Can I include GST on an invoice if I’m not registered?
No. Charging GST without being registered is not allowed. Doing so can cause compliance issues and may require corrections or refunds.
Does an invoice need payment terms to be valid?
Payment terms are not mandatory, but they are strongly recommended. Clear due dates and late payment terms help protect your cash flow and reduce disputes.
What happens if my invoice says “Tax Invoice” but I’m not registered for GST?
If your invoice is labelled “Tax Invoice” and you are not registered for GST, the invoice is incorrect and may cause compliance issues with the Australian Taxation Office (ATO).
In Australia, the wording “Tax Invoice” is reserved for businesses registered for GST. Using it when you are not registered can mislead customers into thinking GST has been charged, even if no GST amount appears on the invoice.
This can result in:
Confusion for customers registered for GST
Delays in payment while invoices are corrected
Requests to reissue invoices
Potential compliance concerns during an ATO review
If this occurs, the invoice should be reissued as an “Invoice” only, with no GST shown and wording such as “No GST applied” or “Not a taxable supply.”
How is a change in my GST registration status shown on an invoice so customers can clearly see it?
When your GST registration status changes, the difference must be clearly visible on every invoice issued from that date onward.
If you become registered for GST, your invoice must:
Be titled “Tax Invoice”
Display your ABN
Show GST separately or include clear wording such as “Total price includes GST”
If you cancel your GST registration, your invoice must:
Be titled “Invoice”
Show no GST amounts or GST columns
Clearly state “No GST applied” or “Not a taxable supply”
These visual changes allow customers to immediately understand whether GST applies and whether they can claim GST credits.
Need help getting invoices right?
Correct invoicing supports cash flow, compliance, and stress-free BAS lodgement. Support is available if you’d like help reviewing your invoice setup or GST obligations.