Head Contractor Not Paying Your Subcontract? Use the Security of Payment Act

You’ve finished the work. The invoice went out weeks ago. The head contractor isn’t returning calls, and your account is hurting. If you’re a subcontractor or tradie in Australia, you’re not powerless—and you don’t have to wait months for court.

Every Australian state and territory has a Security of Payment Act (or equivalent). These laws exist to keep the construction industry honest by giving subcontractors a fast, affordable way to force payment disputes into a formal process called adjudication. It’s not perfect, but it’s designed with you in mind.

Why the Security of Payment Act Matters

Construction is built on cash flow. When a head contractor holds onto your money, it cascades down. You can’t pay your own suppliers or workers on time. Your business stalls. Traditional court action takes years and costs tens of thousands in legal fees.

The Security of Payment legislation sidesteps all that. Instead of suing, you file a payment claim that triggers a legal obligation on the head contractor to respond within days. If they dispute it, both sides go to fast-track adjudication—a quicker, cheaper process where an independent adjudicator hears both arguments and makes a binding decision.

The point isn’t to bypass the courts entirely. It’s to create pressure and clarity fast. Many debtors choose to pay or settle rather than face adjudication, because the cost and hassle of defending a weak position becomes real.

How the Process Works (The Practical Steps)

The exact rules vary by state, but the bones are the same across NSW (Security of Payment Act 1999), Queensland (Building Industry Fairness Act 2017), Victoria (Security of Payment Act 2002), Western Australia, South Australia, and the rest. Here’s the general flow:

1. You issue a payment claim — a formal document setting out the work done, the amount owed, and the date it’s due. It must follow the Act’s requirements for your state.
2. The head contractor has a set period to respond — typically 10 business days in NSW, for example — with either payment or a “payment schedule” (their reasons for disputing or delaying).
3. If they don’t pay or respond properly, you can lodge an adjudication application with an authorised adjudicator.
4. The adjudicator hears both sides and issues a determination within 10 business days (or longer by agreement).
5. If the determination is in your favour, it’s binding and can be enforced through the courts if the head contractor refuses to pay.

Sounds formal? It is. But compared to litigation, it’s remarkably quick and cheap.

State-by-State Rules You Need to Know

The Security of Payment Act isn’t one national law—it’s state-based. The differences matter:

• NSW: Security of Payment Act 1999. Respondent has 10 business days to issue a payment schedule.
• Queensland: Building Industry Fairness Act 2017. Applies to construction contracts; similar timeline and process.
• Victoria: Security of Payment Act 2002. Ten calendar days for payment schedule; slightly different adjudication rules.
• Western Australia, South Australia, ACT, NT: All have their own versions with similar principles but varying timeframes and thresholds.

The good news: the process is broadly the same. The bad news: you need to follow your state’s rules precisely. One wrong date or missing clause and you might lose the right to proceed.

Getting It Right: Why It Matters

A payment claim isn’t a casual email. It has to comply with your state’s Act. It needs to be served correctly. It needs to include the right information—what work was done, when, what you’re owed, and what’s already been paid.

Mess up the paperwork, and the head contractor can reject your claim as invalid. Then you’re back to square one.

This is where a self-service tool like filing a payment claim through PayClaim saves time and money. The platform walks you through the requirements for your state, generates a compliant claim, and handles the formatting so it meets the Act’s standards. At a flat fee of AUD $79, it’s a fraction of what a lawyer would charge—and you keep control of the process.

What Happens Next?

Once your claim is filed and served, the ball is in their court. Literally. They have days to respond, not weeks. That pressure alone often prompts settlement conversations.

If they ignore you or respond with a weak payment schedule, adjudication becomes an option. An adjudicator will review the contract, your claim, and their response, then make a decision. It’s not a full trial, but it’s binding and enforceable.

If they still don’t pay after adjudication finds in your favour, you can pursue enforcement through debt recovery or court action—but at that point you have a formal decision backing you up.

The Bottom Line

The Security of Payment Act exists because construction subbies and tradies used to get crushed by payment delays. Now you have a legal tool that’s fast, cheap, and designed to work for you.

You don’t need a lawyer to start. You don’t need to spend thousands on court fees. You need a properly formatted payment claim, the right state-based rules, and the willingness to push back.

If a head contractor owes you money, start here. Act now. Don’t let cash flow bleed out of your business while waiting for goodwill to kick in.

Owed money? You can start your Letter of Demand here — see the whole letter free, then a flat $69 to issue it. PayClaim is not a law firm; payment outcomes are not guaranteed.