What Is Security of Payment (SOP)?
Security of Payment (SOP) is a body of Australian state and territory legislation that gives contractors, subcontractors and suppliers a statutory right to be paid progressively for construction work they carry out, running alongside, and overriding, whatever the underlying contract says. A valid payment claim made under the relevant Act triggers a strict, short deadline for the other side to respond with a payment schedule, and if they don’t, the full amount claimed can become an enforceable debt, with a fast statutory adjudication process available to resolve genuine disputes without going to court.
Key takeaways
- Security of Payment (SOP) legislation exists in every Australian state and territory, giving contractors and subcontractors a statutory right to progress payments that can’t be excluded by contract.
- A valid payment claim triggers a strict deadline, commonly around 10 business days though it varies by state, for the other side to issue a payment schedule.
- If no payment schedule is issued in time, the full claimed amount typically becomes a debt due and payable, regardless of whether the work was actually worth that much.
- Disputed claims can go to statutory adjudication, a fast, interim process, rather than waiting for a final resolution through the courts.
- SOP rights exist on top of the contract, so knowing the process matters just as much as pricing the work correctly in the first place.
What is Security of Payment?
Security of Payment is the informal name for a set of construction industry payment Acts, one in each Australian state and territory, designed to make sure contractors, subcontractors and suppliers actually get paid for work they’ve genuinely carried out, without having to wait months or fight through the courts to see the money. The Acts were introduced from the late 1990s onward, largely in response to late payment and insolvency cascading down the subcontracting chain, where a business several tiers down could do the work and still end up unpaid because of a dispute, or a failure, further up.
The core idea is the same across every state, even though the specific timeframes and procedures differ: a contractor’s right to make a progress payment claim, and the other side’s obligation to respond within a strict timeframe, exists as a matter of statute, not just as a matter of what the contract happens to say. Crucially, a construction contract cannot validly exclude or restrict these rights; where a contract tries to, the Act generally overrides it.
SOP rights apply to most construction contracts, from a small subcontract through to a head contract on a major project, though each state’s Act carves out some exclusions, certain owner-occupier residential contracts, for instance, are treated differently in several states. Because the detail genuinely differs by jurisdiction, it’s worth checking the specific Act that applies to where the work is being carried out.
In plain terms
Security of Payment is a legal safety net underneath every construction contract: pay for work actually done, respond to a claim within a strict deadline, or the whole amount can become owed by default.
What Security of Payment protects
SOP legislation is built around a handful of core statutory rights that exist regardless of what the contract says.
- The right to make a progress payment claim — a contractor or subcontractor can claim for work done at defined intervals tied to a “reference date” under the contract.
- The right to a timely response — the party being claimed against must issue a payment schedule within the statutory deadline if it intends to pay less than claimed, or nothing at all.
- The right to recover an undisputed or unanswered amount as a debt — enforceable through the courts like any other debt, without needing to prove the underlying merits of the work again.
- The right to fast, interim adjudication — a statutory dispute resolution process for genuinely disputed claims, decided far more quickly than litigation.
- The right to suspend work — in most states, an unpaid claimant can suspend the works after giving notice, if a scheduled or adjudicated amount goes unpaid.
How Security of Payment works — payment claims and payment schedules
The mechanics run on a strict timeline. A contractor serves a payment claim, referencing the Act, for work carried out up to a reference date. The respondent then has a set number of business days to issue a payment schedule, stating how much it proposes to pay and, if less than claimed, its reasons for the shortfall.
This timeline is unforgiving by design. Miss the deadline for a payment schedule, and in most states the full claimed amount becomes payable as a statutory debt, a consequence that exists specifically to stop payment claims being ignored or quietly sat on.
| Step | Who acts | Typical timeframe |
|---|---|---|
| Payment claim served | Claimant | On or after the reference date |
| Payment schedule due | Respondent | ~10 business days |
| Adjudication application (if disputed) | Claimant | ~10-20 business days after the schedule or its due date |
| Adjudication response | Respondent | ~5-10 business days after receiving the application |
| Adjudication determination | Adjudicator | ~10 business days after accepting the application |
What happens if a payment claim isn’t answered
If the respondent doesn’t issue a payment schedule within the statutory timeframe, the consequence in most Australian states is severe and immediate: the full amount claimed becomes a debt due and payable, regardless of whether the work was actually completed to that value. The claimant can then recover it as a straightforward debt through the courts, without having to re-litigate the merits of the claim.
Even where a payment schedule is issued, if the scheduled amount, or none of it, isn’t actually paid by the due date, the claimant generally has the right to apply for adjudication or, in some circumstances, to sue for the unpaid scheduled amount directly, both routes exist precisely so an unpaid claimant isn’t left with no practical remedy.
Adjudication under the Security of Payment Act
When a payment claim is genuinely disputed, a payment schedule is issued for a lower amount, or none is issued at all, the claimant can apply for adjudication, a fast, statutory process that determines how much, if anything, is actually payable, usually within a matter of weeks rather than the months or years a court case can take.
Adjudication is deliberately an interim remedy — it decides who gets paid now, not who is ultimately right under the contract, and either party can still pursue a final resolution through litigation or arbitration later. This “pay now, argue later” approach is exactly what keeps cash moving down the contracting chain during a project, rather than tied up in a dispute that might otherwise run for its full duration.
Who can use Security of Payment rights
SOP rights are available to head contractors, subcontractors and suppliers on eligible construction contracts, right down the contracting chain — a specialist trade subcontractor several tiers below the head contractor has exactly the same statutory rights as the head contractor does against the client, under their own contract.
Each Act carves out some exclusions, and the detail varies by state, some residential owner-occupier building contracts, for example, are treated differently or excluded outright in several jurisdictions. Because eligibility genuinely depends on the type of contract and the state the work is in, it’s worth checking the current position under the relevant Act rather than assuming coverage applies uniformly everywhere.
Security of Payment vs the underlying contract
SOP is often confused with the contract itself, or with the adjudication process it enables, but each is a distinct layer:
- SOP vs the contract — the contract sets out the agreed payment terms; SOP legislation exists on top of it as a statutory minimum that can’t be contracted out of, even if the contract tries to say otherwise.
- SOP vs adjudication — SOP is the broader statutory scheme; adjudication is the specific dispute resolution process it creates for disputed payment claims.
- SOP vs litigation — SOP adjudication is fast and interim; litigation or arbitration is slower but finally determines the parties’ actual contractual rights, and can still follow an adjudication if either side wants a final answer.
Common mistakes with Security of Payment claims
Most SOP disputes trace back to a handful of avoidable errors rather than a genuine disagreement about the work.
- Not referencing the relevant Act on a payment claim, which can affect whether it’s treated as a valid statutory payment claim rather than an ordinary invoice.
- Missing the payment schedule deadline, which can make the full claimed amount payable regardless of the work’s actual value.
- Claiming against the wrong reference date, or before one has arisen under the contract.
- Assuming SOP rights don’t apply because the contract is silent or says otherwise — the statutory rights generally exist regardless.
- Letting a dispute drift instead of applying for adjudication within the statutory window, which is time-limited and unforgiving if missed.
How My Trade Hub helps with Security of Payment
My Trade Hub’s invoicing module builds every progress claim from the same measured Bill of Quantities and schedule of values used to prepare the original estimate, so the amount claimed is always traceable back to real, itemised progress rather than a round-number guess.
Because retention, previous payments and approved variations are tracked automatically against that same record, you have a clear, defensible history to point to the moment a payment claim is questioned, exactly the kind of evidence that matters if a dispute ever needs to go to adjudication.
Frequently asked questions
What does Security of Payment mean?
Security of Payment (SOP) refers to Australian state and territory legislation that gives contractors, subcontractors and suppliers a statutory right to be paid for construction work carried out, with strict deadlines for responding to a payment claim and a fast adjudication process if it’s disputed.
Does Security of Payment apply in every Australian state?
Yes, every state and territory has its own Security of Payment Act, and each gives broadly similar rights, though the specific timeframes, forms and exclusions differ, so it’s worth checking the current Act for the state the work is carried out in.
What happens if I don’t respond to a payment claim in time?
In most states, if you don’t issue a payment schedule within the statutory deadline, the full amount claimed becomes a debt due and payable, regardless of whether the work was actually worth that much. Missing the deadline is one of the most costly mistakes a respondent can make.
Can I contract out of Security of Payment rights?
No, generally not. SOP legislation is designed to override any contract term that tries to exclude or reduce these statutory rights, so the protections apply regardless of what the contract says.
What is the difference between Security of Payment and adjudication?
Security of Payment is the overall statutory scheme protecting a contractor’s right to progressive payment; adjudication is the specific fast, interim dispute resolution process that the Act creates for resolving a genuinely disputed payment claim.
Do homeowners have to respond to a payment claim under Security of Payment?
It depends on the state and the type of contract — several states exclude or treat certain owner-occupier residential building contracts differently under their Security of Payment Act, so check the specific exclusions that apply where the work is being done.
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