Payment Claims vs Tax Invoices: What’s the Difference?

Many subcontractors use their tax invoices as their “payment claim” under the Security of Payment Act — and many of them get it wrong. While a tax invoice and a payment claim can sometimes be combined in a single document, they are fundamentally different things with different purposes. Understanding the distinction is critical to protecting your legal rights.

What Is a Tax Invoice?

A tax invoice is a GST document. Under the GST Act, you must issue a tax invoice to your customers for taxable supplies over $82.50. A tax invoice must include:

• The words “Tax Invoice” prominently displayed
• Your business name and ABN
• The date of issue
• The buyer’s name or ABN (for invoices over $1,000)
• A description of the goods or services
• The GST amount or a statement that the price includes GST

A tax invoice is a commercial document. It doesn’t automatically trigger any Security of Payment rights.

What Is a Payment Claim?

A payment claim is a legal document under a state or territory Security of Payment Act. It triggers specific statutory obligations on the head contractor, including the requirement to issue a payment schedule within 10–15 business days and potentially defend a claim in adjudication. A payment claim must include:

• Be in writing
• Identify the construction work or related goods and services it relates to
• State the amount claimed
• In most states, include a statement that it is made under the relevant Security of Payment Act (e.g., “This is a payment claim made under the Building and Construction Industry Security of Payment Act 1999 (NSW)”)

Can a Tax Invoice Also Be a Payment Claim?

Yes — in most states, a document can serve as both a tax invoice and a payment claim if it includes all the required elements of each. Many contractors combine them in a single document for simplicity. The key is including the SOP Act endorsement statement on the same document as your tax invoice information.

However, caution is needed. If your document doesn’t include the required payment claim elements — particularly the SOP Act statement — it may be a valid tax invoice but not a valid payment claim. That means the head contractor has no legal obligation to respond within the SOP Act timeframes, and your statutory rights are not triggered.

State-by-State Differences on the Endorsement Requirement

• QLD (BIF Act): Must state it is a payment claim under the BIF Act
• NSW: Must state it is a payment claim under the NSW SOP Act
• VIC: Must identify the construction work and be served at the right time — the Act endorsement statement is not explicitly required but is best practice
• WA: Must be identified as a payment claim under the Construction Contracts Act
• SA, TAS, ACT: Similar to NSW — endorsement statement required

The Practical Takeaway

Always include both the tax invoice information and the SOP Act endorsement statement on your payment documents when claiming for construction work. This simple step protects your legal rights and ensures the head contractor is legally obligated to respond.

Better yet — let PayClaim prepare your payment claims. We ensure every claim includes all required elements under the applicable state Act, is correctly formatted, and is served in a legally valid way. Start your free claim today.