Security of Payment Act Australia: How Contractors Can Recover Unpaid Invoices

Late payment is one of the most damaging problems facing Australian contractors and subcontractors. Industry data consistently shows that construction and trade businesses wait longer to get paid than almost any other sector — often 60 to 90 days on invoices that were due in 14 or 30. Every state and territory in Australia has enacted Security of Payment legislation specifically to address this. If you do construction, trade, or professional services work in Australia, understanding these laws could save your business.

What Is the Security of Payment Act?

Australia does not have a single national Security of Payment Act. Instead, each state and territory has its own legislation, though they share common principles. The laws collectively protect contractors, subcontractors, suppliers, and consultants in the construction industry by giving them a statutory right to progress payments — independent of any dispute about the broader contract.

The key principle is this: if you have done the work, you have the right to be paid for it promptly, and the legislation provides a fast-track process (adjudication) to enforce that right without going to court.

Note: This article provides general information only. The specific rules, timelines, and claim amounts vary by state. Always check the legislation applicable to your state, and consult a construction lawyer for complex disputes.

Who Is Covered?

The Security of Payment laws cover a wide range of parties involved in construction and related work. In most states, you are covered if you are:

• A head contractor doing work under a construction contract
• A subcontractor supplying labour or materials
• A consultant providing design, engineering, or advisory services related to construction
• A supplier delivering materials to a construction site

Residential construction contracts (where the owner is living in, or intends to live in, the property) are excluded or treated differently in some states. In NSW, for example, residential building contracts where the respondent is a homeowner are excluded from the Act.

The construction work covered extends beyond bricks and mortar. It includes civil engineering, landscaping, electrical, plumbing, mechanical services, and professional services (architecture, engineering) connected to construction.

The Payment Claim: Your Most Powerful Tool

Under the Security of Payment legislation, a payment claim is not just an invoice — it is a formal legal document that triggers statutory rights and obligations. Making your invoice a valid payment claim under the Act gives you access to the adjudication process if payment does not arrive.

What Makes a Valid Payment Claim?

The specific requirements vary by state, but in most jurisdictions a valid payment claim must:

1. Identify the construction work or goods and services: Your claim must describe what you are claiming payment for. A vague “Services rendered” is insufficient — reference specific work stages, purchase order numbers, or periods.
2. State the claimed amount: The total dollar amount being claimed must be clearly stated.
3. State the due date: When payment is due according to your contract (or the statutory period if the contract is silent).
4. Be served under the Act: In NSW and most east-coast states, the claim must include a statement that it is made under the relevant Security of Payment Act. Without this endorsement, the claim may not activate the statutory regime. The required wording is typically: “This is a payment claim made under the [Act name].”

Payment Claim Timing Rules

Each state has rules about when you can serve a payment claim. In most jurisdictions, you can only serve one payment claim per reference date — typically the date specified in the contract for progress claims, or the last day of each month if the contract is silent.

Missing your reference date can cost you a month. Set up calendar reminders, or use accounting software to generate your claims on the correct dates every time.

The Payment Schedule: What Happens After Your Claim

Once you serve a valid payment claim, the respondent (the party you are claiming from) must either:

• Pay the full claimed amount by the due date, or
• Serve a payment schedule within the statutory timeframe (typically 10 business days in NSW and QLD; check your state)

A payment schedule must state the amount the respondent intends to pay and the reasons for any reduction. If the respondent disputes part of your claim, the payment schedule is where they must say so — and provide their reasons.

Adjudication: The Fast-Track Dispute Resolution Process

If the respondent provides a payment schedule for a lesser amount than you claimed, you can apply for adjudication — a fast, inexpensive process for resolving payment disputes without going to court.

How Adjudication Works

1. Apply to an authorised nominating authority (ANA): Each state has registered ANAs (organisations accredited to administer adjudications). You submit your adjudication application through them, usually within a strict timeframe after receiving the payment schedule (commonly 10 business days).
2. Submit your application: Your application must include the payment claim, the payment schedule (if any), your contract, and supporting documentation for the amount you are claiming.
3. The respondent replies: The respondent has a short window (typically 5 business days) to submit an adjudication response.
4. The adjudicator decides: An independent adjudicator reviews the submissions and must issue a determination within 10 business days (or 15 for complex matters). The determination states how much, if anything, must be paid.
5. Payment or enforcement: If the adjudicator determines that money is owed, the respondent must pay within 5 business days. If they do not, you can file the determination as a court judgment and enforce it like any other judgment debt.

The entire adjudication process typically takes 4 to 6 weeks — compared to 12 to 18 months for court litigation. Costs are also significantly lower, though complex adjudications can involve legal fees.

QLD’s Project Trust Accounts: Extra Protection for Subcontractors

Queensland’s Building Industry Fairness Act 2017 introduced Project Trust Accounts — one of the strongest subcontractor protections in Australia. On qualifying projects (generally government projects over $1 million and private projects over $10 million), head contractors must hold subcontractor payments in a trust account managed by an approved financial institution.

This means subcontractor money cannot be used for the head contractor’s own purposes or caught up in an insolvency. If the head contractor goes under, the subcontractor trust funds are protected. The QLD regime has been progressively rolling out to cover more project types and sizes since 2021.

If you are a subcontractor on a large QLD project, check whether project trust accounts apply. If they do and the head contractor is not operating them correctly, that is a serious compliance issue you can report.

Practical Steps to Protect Yourself: Before a Dispute Arises

The Security of Payment Act is most effective when you are prepared before problems start. Here is what experienced contractors do:

1. Get the contract in writing

The Security of Payment legislation can imply statutory payment terms into oral contracts, but written contracts are far cleaner to enforce. Even a simple written scope of works with agreed rates and payment terms protects you significantly better than a handshake deal.

2. Know your reference dates

Identify the reference date in your contract. This is the date on which you are entitled to serve a payment claim. Calendar these dates at the start of every project. Missing a reference date means waiting another cycle.

3. Keep site records

Adjudicators base their decisions on evidence. Daily site diaries, progress photos, delivery dockets, and contemporaneous records of work completed give you the evidence base to support your claims. A payment claim that says “we completed Phase 2 as per the schedule” is much stronger when you have photos, sign-off records, and materials delivery receipts to back it up.

4. Invoice correctly from the start

Every progress claim should include the statutory endorsement if you want to preserve your rights under the Act. This does not commit you to adjudication — it simply ensures the option is available. The cost of adding a one-line statement to your invoice template is zero.

5. Act promptly when payments are late

The Security of Payment legislation is time-sensitive. Rights to adjudicate expire. Do not wait three months hoping a slow payer will eventually come good — by then your adjudication window may have closed. If a payment schedule is not provided or payment does not arrive by the due date, take action within the statutory timeframe.

How to Use Xero to Stay Adjudication-Ready

Adjudications are won or lost on documentation. Your accounting software plays a critical role in keeping that documentation organised. Here is how Xero users in the construction industry can set themselves up:

• Use Xero Projects or Tracking Categories: Allocate all costs and invoices to specific projects from day one. If a dispute arises, you can instantly generate a profit and loss by project showing exactly what was incurred and what was invoiced.
• Attach all site documentation to invoices: Use Xero’s file attachment feature to link progress photos, delivery dockets, and variation approvals to the relevant invoice. Your entire record for each payment claim is in one place.
• Track invoice delivery: Xero’s email tracking shows when an invoice was opened. While this does not prove physical service of a payment claim (which has specific requirements), it provides a useful record of communication.
• Monitor aged receivables weekly: Xero’s aged receivables report lets you see exactly which invoices are overdue and by how many days. For construction businesses with statutory rights, this report should be reviewed weekly — not monthly.
• Set early payment reminders: Do not wait until invoices are 60 days overdue to follow up. Automated reminders at 3 days before due date, on the due date, and 7 days overdue give you a documented follow-up trail that supports a “failure to pay” narrative if you proceed to adjudication.

When to Get Legal Advice

The Security of Payment process is designed to be accessible without lawyers, and many straightforward claims are successfully adjudicated by contractors acting for themselves. However, legal advice is strongly recommended when:

• The disputed amount is significant (generally above $50,000)
• The other party has served a complex payment schedule disputing multiple items
• There are related contract termination or defect disputes
• You are unsure whether your contract and work fall within the Act’s coverage
• You have missed a statutory timeframe and need to understand your options

Many construction lawyers offer fixed-fee adjudication support services. Given what is at stake in a large unpaid invoice, legal fees are often well justified.

The Bottom Line: Know Your Rights, Act Quickly

The Security of Payment legislation exists because parliament recognised that slow payment from up the chain causes genuine harm to contractors, subcontractors, and their workers. The laws give you powerful tools — but those tools only work if you use them correctly and on time.

The practical starting point is simple: endorse every progress claim with the statutory statement, keep meticulous records, and know your reference dates. If payment does not arrive, act within the timeframes rather than hoping the situation resolves itself.

Prevention is also better than adjudication. Consistent, professional payment reminders — starting before an invoice is even due — often resolve cash flow problems before they become disputes. Clients who know you track and follow up promptly are less likely to treat your invoices as optional.

This article provides general information only and does not constitute legal advice. The Security of Payment legislation varies significantly by state. Consult a qualified construction lawyer for advice about your specific situation.

Tags: Security of Payment Act Australia, contractor unpaid invoices, construction payment claims, subcontractor rights Australia, adjudication construction, SOPA QLD NSW VIC, debt recovery construction industry