The Security of Payment Act: Your Legal Right to Get Paid for Work You've Done

You finished the job. You sent the invoice. And then — nothing. The builder doesn't answer your calls. The head contractor says the paperwork's "still being processed." The project manager tells you payment run isn't until next month. Week turns into month, and suddenly you're paying your own suppliers out of your back pocket while someone else sits on your money.

Every tradie who's done commercial work knows this feeling. It's the great Australian tradie tradition of being the last person in the payment chain — and the first one to feel the squeeze when cash flow dries up.

What most tradies don't know is that you've got a legal weapon sitting in your back pocket. It's called the Building and Construction Industry Security of Payment Act — and when used right, it forces the person who owes you money to pay up fast.

Here's what it is, when to use it, and exactly how it works.

The Security of Payment Act (SOPA for short) exists for one reason: to stop head contractors and builders from starving small trade businesses of cash flow. It says that if you've done work, you have a legal right to be paid — and if someone disputes your invoice, they can't just sit on it. They've got to either pay you or formally dispute it within strict timeframes.

Every state has its own version — NSW has the Building and Construction Industry Security of Payment Act 1999, Victoria has the SOP Act 2002, Qld has the Building Industry Fairness (Security of Payment) Act 2017 — but they all work on the same principle: pay now, argue later.

This is the big one. The Act flips the usual legal process on its head. Normally, if you want to get paid and someone's not paying, you've got to take them to court — which costs money and takes forever. Under SOPA, you serve a payment claim, they've got to respond within tight deadlines, and if they don't pay, you can suspend work or go straight to adjudication without a lawyer.

Here's the honest answer: not every late payment needs a payment claim under SOPA. If your regular client is a week late because they've had a bad month, you don't burn that relationship with a statutory demand. You pick up the phone first.

Use SOPA when: - A builder or head contractor is sitting on your invoices past the due date with no explanation - Someone's using "we're reviewing your invoice" as a delaying tactic for weeks on end - You've done the work and the client is suddenly claiming the work wasn't up to scratch (but they never mentioned it before the invoice landed) - You're a sub-subcontractor and the bloke above you hasn't been paid, so you're not getting paid either — the Act protects your right to payment even if someone further up the chain is holding cash

Don't use it for: - A one-off residential job where the homeowner is just a bit slow paying — you're better off with a friendly reminder and a late payment fee - Small amounts where the cost of adjudication outweighs what you're owed - Situations where you genuinely stuffed up the work and the dispute has merit

Here's the process, stripped of legal jargon.

Step 1: Serve a Payment Claim. This is just a properly formatted invoice or claim that says "I did this work, here's what it's worth, pay me by this date." It needs to reference the Act — usually a line like "This is a payment claim made under the Building and Construction Industry Security of Payment Act." That's it. You don't need a lawyer to write it, but you should get the format right for your state.

Step 2: Wait for the Response. The person you sent it to has to respond with a Payment Schedule — basically a formal document that says either "yes we'll pay what you asked" or "we're paying this amount instead because X, Y, Z." They've usually got 10 to 15 business days depending on your state. If they don't respond at all — you win by default. The Act says silence equals agreement.

Step 3: Apply for Adjudication. If they respond but don't pay — or they don't respond at all — you can apply for adjudication through your state's authorised adjudication body. This is a fast, paper-based review where an independent adjudicator looks at your claim and their response and decides who's owed what. It's designed to be cheap and quick — usually resolved within 20 to 30 business days.

Step 4: Enforce the Decision. If the adjudicator says you should be paid and they still don't pay, the adjudication determination can be enforced as a court judgment. That means you can use the normal debt recovery process — but by this point, you've already got a legal decision on your side, which makes it a lot harder for them to argue.

SOPA is powerful, but it's not magic. Here's what trips tradies up.

Missing the deadlines. The Act runs on strict timelines. Serve your payment claim too late — like after the contract says you've lost your entitlement — and you've got nothing. Each state has different rules about when you can serve a claim. Know your state's deadlines before you send anything.

Not getting the format right. A payment claim under SOPA isn't just any invoice. It needs to clearly state that it's made under the Act, include the reference date from your contract, and specify the amount claimed. Get the wording wrong and a smart respondent will knock it back on a technicality.

Retaliation. Some builders don't take kindly to receiving a payment claim under SOPA. They might stop giving you work, make your life difficult on site, or find another way to squeeze you. It happens. That's why you use this as a tool for when the relationship is already gone — not as a first resort.

Contract exclusions. Some contracts — particularly small residential ones under $20,000 in some states — are excluded from the Act. Check whether your contract type is covered before you rely on it.

The Security of Payment Act exists because the building industry has a systemic problem: tradies at the bottom of the chain carry the cash flow burden for everyone above them. It's not fair, but it's how the industry works. The Act is your way of levelling that playing field without needing a lawyer on retainer.

You don't need to use it every time someone's late. But you need to know it exists. And you need to have the process in your back pocket for when a client — particularly a big one — decides your invoice is optional.

One practical thing you can do today: check what version of the Act applies in your state, and keep a compliant payment claim template in your filing system. You'll be glad you have it when the phone stops ringing and the invoice stays unpaid.

Trade Track helps Australian tradies manage quotes, jobs, and invoices from one simple platform — so when you send a payment claim, you've got the records to back it up. No credit card required · 7-day free trial