Security of Payments on Government & Defence Projects: Your Rights, Your Process, and How to Get Paid
Security of Payments on
Government & Defence Projects
Your rights, your process, and how to get paid. A practical guide for contractors, subcontractors, and commercial managers working across Commonwealth and State Government infrastructure.
The Invoice That Doesn't Get Paid
You've mobilised your team, completed quality work, and submitted a well-prepared progress claim. Then silence. Or worse — a payment schedule comes back disputing half your claim with minimal justification.
Payment disputes are one of the most damaging — and most preventable — challenges facing contractors delivering Commonwealth, Defence, and State Government infrastructure. The problem isn't always bad faith. Often it's process failures: unclear contract terms, poor documentation, missed timeframes, or a head contractor applying unlawful assessment practices under pressure from their own principal.
Whether you're running a facilities upgrade for a Commonwealth agency, a construction package on a Defence base, or a civil works subcontract under a Tier 1 head contractor, knowing your rights under Security of Payment legislation — and having systems to back those rights up — is not optional. It's the difference between getting paid and not.
"Most payment disputes we see weren't inevitable. They were the result of preventable gaps in documentation, process, or early escalation. Get the foundations right and the disputes largely don't happen."
Security of Payment Legislation — By State
Security of Payment (SOP) legislation exists in every Australian state and territory. It gives contractors, subcontractors, and suppliers the right to make progress claims and pursue rapid adjudication when payment is withheld, disputed, or not scheduled — without going to court. Know which Act applies to your project.
Key Agencies — What to Know
Working with government clients involves navigating agency-specific procurement frameworks, approval workflows, and contract vehicles. Each has its own internal processes that affect payment timelines. Here's what every commercial manager and project manager needs to understand about Australia's major government client organisations.
Contracts under ASDEFCON and DPPI. Strict documentation, NV1/NV2 clearance requirements, and mandatory HOTO completion protocols. Payment claims must be precisely substantiated against contracted milestones. Internal approval chains can be lengthy — plan ahead. Defence contracting →
High-security facilities with strict access and documentation protocols. Progress claims must clearly tie to contracted scope and approved security protocols. Existing relationships are a major advantage for framework and standing offer arrangements. DFAT procurement →
Complex multi-stage delivery across laboratory and specialist research facilities. Internal approval workflows can extend payment timelines significantly. Understand the internal approval chain before submitting each claim — early engagement with FM leads avoids delays. CSIRO procurement →
Large-scale infrastructure under GC21 and MW21 contract conditions. Strict payment schedule timeframes — missing these voids entitlements. RIW accreditation is mandatory. Monitor Infrastructure NSW pipeline for early EOI opportunities. TfNSW suppliers →
High-volume repeat works across residential and base facilities. Disputes most often arise from informal scope creep — establish formal variation registers from day one. DHA suppliers →
Secure facility fitouts with live operational environments. Claims can compound quickly in time-sensitive environments. Lead with clear, well-documented progress claims and keep the variation register current. ABF procurement →
Security-cleared facility works with operationally sensitive environments. Maintain meticulous site records and daily signed day sheets — these are your primary commercial evidence in this sector. AFP procurement →
Customised principal-supply contracts. Operational continuity clauses create grey areas around delays and disruptions. RIW accreditation is a mandatory qualifier — lead with it in all outreach and documentation.
Subcontract payment obligations flow from the head contract. Ensure your subcontract preserves full SOP rights — back-to-back arrangements can inadvertently waive entitlements. Review before you sign. Register on AusTender →
Significant subcontract packages with variation and delay cost management at the core. Variation management and proactive record keeping are the primary commercial risk areas.
Common Contracts in Defence & Commonwealth Projects
These are the contract vehicles and standard forms you'll encounter most frequently across government infrastructure delivery. Understanding their payment provisions before you sign is essential.
How Early Engagement Recovered a Disputed Claim
The following case illustrates how proactive involvement — before a dispute escalates — can change the outcome entirely.
The situation: A subcontractor engaged Secure SME after receiving a payment schedule from a Tier 1 head contractor that unlawfully reduced their progress claim assessment. The reduction was applied without adequate substantiation, and verbal instructions given on site had not been followed up in writing — creating a documentation gap the head contractor was exploiting.
What we did: We immediately reviewed the subcontract terms, the claim, and the payment schedule response in detail. We identified the specific provisions the head contractor had failed to comply with, and the agreements — both written and verbal — that supported the full claim value. We assisted the subcontractor in preparing a formal, substantiated response that clearly referenced the applicable contract provisions and the work completed, backed by site records and day sheets.
The key moves: We back-briefed all verbal instructions in writing, confirmed the scope agreements in place, and demonstrated through contemporaneous records that the work had been completed as instructed. We also ensured the response was lodged within the correct SOP timeframes — preserving adjudication rights if the dispute had escalated.
The head contractor, faced with a well-structured and legally grounded response, revised their position. No adjudication was necessary.
The SOP Claims Process — Step by Step
Use this as the basis for your team's internal SOP. The process applies whether you're contracting directly with a government agency or working as a subcontractor under a Tier 1 head contractor. Every stage has strict timeframes — missing them can forfeit your rights.
Prevention Is Better Than Adjudication
Most disputes we encounter were preventable. The contractors who avoid them consistently do the same things: they document everything, they claim regularly, they follow up verbals in writing, and their site teams understand the commercial basics. Here are the foundations every project needs from day one.
Day sheets are your single most important piece of commercial evidence. Have them signed by the client or head contractor representative on the day — not at the end of the week or month. An unsigned day sheet is almost worthless in a dispute. If getting a signature is difficult, send a same-day email confirming what was done.
Delayed claiming delays cash flow and creates disputes. Claim monthly at a minimum — consistently on the same date each month as required under your contract. Monthly claims build a documented progress record and make disputes much harder to sustain. Late or infrequent claims invite pushback.
If a superintendent, project manager, or site manager gives you a verbal instruction to carry out work, send a same-day email confirming it: "As discussed today, we will proceed with [scope] as instructed by [name]. Please confirm." This converts a verbal instruction into a written record that is very difficult to later dispute.
Every change to scope — however minor — must be logged in a variation register from the moment you become aware of it. Include the date, nature of change, who instructed it, and estimated value. Don't wait until project end to rationalise variations. By then, memories fade and records are incomplete.
Before mobilisation, confirm in writing: the correct form of progress claims, the reference date, how claims should be submitted and to whom, and the expected timeframe for payment schedule responses. Getting this clarity upfront prevents avoidable disputes later.
Under SOP legislation, timeframes are strict and unforgiving. In NSW, the respondent has 10 business days to issue a payment schedule. Miss your window to respond to a disputed schedule and you can forfeit adjudication rights. Brief your whole team on critical project dates — not just your commercial manager.
Back-to-back subcontract arrangements can inadvertently limit or waive your SOP entitlements if payment terms are poorly drafted. Have subcontract payment clauses reviewed before execution — not after a dispute arises. The cost of a review is negligible compared to the cost of a disputed claim.
Your site managers and project engineers are first to know when a commercial issue is emerging. Equip them with the basics: how to document daily work, when to escalate, what constitutes a direction to vary scope, and how to handle a verbal instruction. A brief annual training session pays for itself many times over.
Talk to Secure SME — Before and After
We work with contractors, subcontractors, and commercial teams across Defence, Commonwealth, and State Government projects. Whether you want to build better processes before a problem emerges, or resolve a dispute that's already underway, we can help.
Build a clear, practical claims SOP for your business — tailored to your contract framework, project environment, and team structure.
Progress claim templates, variation notice drafts, back-brief email formats, and payment schedule response frameworks — ready to use on your next project.
Hands-on support preparing and lodging progress claims, reviewing payment schedule responses, and preparing adjudication applications where needed.
Practical training for project managers, site managers, and commercial teams on SOP rights, variation management, and daily documentation — delivered on-site or remotely.
Experienced, security-cleared commercial managers and project managers embedded into your team for the duration of a project. Full capability — without the permanent overhead.
Review of subcontract payment terms and back-to-back provisions before execution — ensuring your SOP rights are preserved and key obligations are understood.
Talk to Us Before a Dispute Becomes a Crisis
Whether you're setting up a new project, managing an existing one, or already in a payment dispute — Secure SME is ready to help.
