What the Act is for
The Building and Construction Industry Security of Payment Act 1999 (NSW) exists to keep cash moving down the contracting chain. Construction is done on credit: subcontractors buy materials and pay their crews, then wait to be paid for work already in the ground. The Act stops that wait from becoming a weapon. It gives anyone who carries out construction work, or supplies related goods and services, under a construction contract a statutory entitlement to a progress payment s 8, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026) — an entitlement that exists regardless of what the contract says, and one you cannot sign away s 34, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026).
The trade-off for that strong right is a strict process. The Act runs on short, defined windows, and a deadline you miss can forfeit a right you would otherwise have. That is why every timeframe on these pages links to the section it comes from and carries an “as of” date, and why the day-counts that drive real deadlines must be confirmed against the current Act text before you rely on them.
Who and what it covers
The Act applies to a construction contract: an arrangement under which one party undertakes to carry out construction work, or to supply related goods and services, for another party. “Construction work” is defined broadly — building, structural work, civil works, fit-out, demolition and more s 5, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026) — and “related goods and services” pulls in materials, plant hire, and professional services such as design and engineering s 6, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026).
It covers commercial construction in NSW. A few things sit outside it — notably certain contracts for residential building work done on a home the other party lives in, and some finance and loan arrangements s 7, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026). If you are a subcontractor or a head contractor on a commercial project, you are almost certainly within the Act. If you are unsure whether your contract qualifies, that is a question for a construction lawyer before you serve anything.
The right to progress payments
The core of the Act is a single, powerful entitlement: from each reference date, a person who has carried out construction work under the contract is entitled to a progress payment s 8, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026). The amount is worked out under the contract, or — if the contract does not provide a method — on the basis of the value of the work actually carried out s 9, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026), valued under the Act’s rules s 10, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026). The date the payment becomes due is set by the contract or, failing that, by the Act s 11, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026).
Because the entitlement is statutory, a “pay when paid” clause — the classic device that made a subcontractor wait until the head contractor was paid from above — has no effect s 12, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026). The money is owed to you on the statutory timetable, not on someone else’s.
The terms you need to know
The Act is built on a handful of defined terms. Get these straight and the rest follows:
- Claimant and respondent
- The claimant is the party owed money and making the claim (you, the subbie or contractor). The respondent is the party who owes it and receives the claim (the head contractor or principal above you).
- Reference date
- The date on and from which you may make a payment claim for work up to that date, set by the contract or supplied by the Act if the contract is silent s 8, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026). Each reference date supports one payment claim.
- Payment claim
- The document you serve on the respondent to ask to be paid. It must identify the work, state the claimed amount, and be served in accordance with the Act s 13, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026).
- Payment schedule
- The respondent’s reply. It must identify the payment claim, state the amount the respondent proposes to pay, and, where that is less than claimed, say why s 14, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026).
- Adjudication
- The fast statutory dispute process. An independent adjudicator decides how much is payable on a payment claim, and the determination is enforceable s 17, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026).
The sequence, step by step
Every progress payment follows the same statutory path:
- Reference date arrives. You become entitled to make a claim for the work done up to it s 8, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026).
- You serve a payment claim. It must meet the content and service rules s 13, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026).
- The respondent replies with a payment schedule. They state what they will pay and why, within the statutory time s 14, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026).
- Payment falls due. The scheduled — or, if no schedule was served, the claimed — amount becomes payable s 11, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026).
- Adjudication, if it is short or unpaid. You apply for adjudication within the statutory window s 17, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026).
Consequences for a respondent
The Act puts the pressure on the respondent. A respondent who receives a payment claim and does not serve a payment schedule within the statutory time becomes liable to pay the full claimed amount on the due date s 14, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026). If they still do not pay, the claimant can recover that amount as a debt in court s 15, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026) or take it to adjudication s 17, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026). On top of recovery, an unpaid claimant may gain a statutory right to suspend work until payment is made s 27, Building and Construction Industry Security of Payment Act 1999 (NSW) (as of 8 July 2026). Because the schedule deadline is the hinge that opens all of this, it is the single most important date to track.
On timeframes: the exact number of days at each step is set by the Act and can be shortened by your contract. The guides and calculators in this cluster show and cite each one, but any date that will drive a real action on a live claim must be confirmed against the current Act text with a construction lawyer. TODO: counsel-verify all day-counts before go-live.
Once you know the shape of the regime, the practical guides take each step in turn — how to serve a compliant payment claim, what to do about a short or missing payment schedule, how adjudication works, and how retention money is protected. Start from the Security of Payment pillar guide to see the whole cluster.