The 5 Most Common Reasons Subcontractors Don’t Get Paid

Not getting paid is one of the biggest threats to a subcontracting business. But non-payment rarely comes out of nowhere — there are patterns and recurring reasons that put subcontractors at risk. Understanding why subcontractors don’t get paid is the first step to protecting yourself. Here are the five most common reasons, and what you can do about each.

1. “Pay When Paid” Clauses and Upstream Cash Flow Problems

One of the most insidious practices in construction contracts is the “pay when paid” clause — a provision that says the head contractor doesn’t have to pay you until they’ve been paid by the developer or principal. In simple terms: the head contractor uses your unpaid invoice to prop up their own cash flow while they wait for money from above.

“Pay when paid” clauses are generally unenforceable in most Australian states under Security of Payment legislation. The law gives you a direct right to payment regardless of whether the head contractor has been paid. But many subcontractors don’t know this — and head contractors rely on that ignorance.

What to do: Serve a payment claim under the Security of Payment Act. The head contractor’s cash flow situation is their problem, not yours.

2. Disputed Variations

Verbal instructions are the lifeblood of construction sites — and the death of many subcontractor invoices. A site supervisor says “just run an extra circuit over there” or “can you do another coat on that wall?” You do the work. You invoice for it. The head contractor’s accounts team has never heard of it.

Variation disputes are one of the most common payment problems in construction, and they’re often entirely avoidable with good documentation practices. Text messages, emails, site diary entries, and photos of work in progress are all valuable evidence when a variation dispute ends up in adjudication.

What to do: Document all verbal instructions immediately. Follow up with a written confirmation email. And if the variation is disputed at invoice time, include it in your payment claim and take it to adjudication.

3. Invoice Timing and Reference Date Issues

Many subcontractors don’t understand when they’re entitled to invoice — and invoice at the wrong time, giving head contractors an easy excuse to reject or delay payment. Security of Payment legislation ties payment entitlements to “reference dates” — specific points in time when a progress payment becomes due. If you invoice before the reference date, the head contractor may legitimately refuse to process it.

What to do: Understand your contract’s reference dates. Invoice at the right time. And if you’re unsure, PayClaim can help you identify when your entitlement to payment arises.

4. Defect Claims Used as Leverage

Head contractors sometimes withhold payment citing alleged defects — even when those defects are minor, unsubstantiated, or have nothing to do with the work covered by the invoice. This is a common tactic to delay payment or force a discount.

Under Security of Payment law, a head contractor who wants to deduct for defects must specify the defect and the amount of the deduction in their payment schedule. They cannot simply claim “defects” as a blanket reason to withhold an invoice. And adjudicators regularly reject vague or unsubstantiated defect claims.

What to do: Request all defect claims in writing. Serve a payment claim. If defects are cited in the payment schedule, challenge them in adjudication with your own evidence of workmanship.

5. Builder Financial Difficulty or Insolvency

The uncomfortable truth: some subcontractors don’t get paid because the builder simply doesn’t have the money. Builder insolvency is a real risk in the Australian construction industry, particularly during periods of rising costs and thin margins. When a builder goes into voluntary administration or liquidation, subcontractors often become unsecured creditors — last in line to recover their money.

The best protection is speed. If you sense a builder is in financial difficulty — they’re slow to pay, making excuses, or there are rumours on the grapevine — act now. A Security of Payment adjudication determination obtained before insolvency may give you stronger recovery rights than an ordinary creditor claim.

What to do: Don’t wait. If a builder is showing signs of financial trouble, serve a payment claim immediately. PayClaim can have a claim lodged within 24 hours of you contacting us.

The Common Thread: Don’t Wait, Act Under the SOP Act

In every one of these scenarios, the solution is the same: don’t wait and hope. Use Australia’s Security of Payment laws to force a formal response and, if needed, get an independent adjudication decision. PayClaim makes this process fast, affordable, and straightforward for subcontractors and tradies across Australia.