Unpaid Subcontractor Invoice: What a Tradie Can Do Without Going Broke

You finished the job. You sent the invoice. Now it’s been 30, 60, 90 days and the builder or head contractor still hasn’t paid. This guide shows you the practical, cost-effective steps to recover an unpaid subcontractor invoice in Australia without burning through your profit margin.

Why subcontractors get stung

Subcontractors sit at the bottom of the payment chain. The head contractor gets paid by the principal, then pays you. If cash flow tightens or the head contractor goes under, you’re the last to know and the first to miss out.

Common reasons your invoice goes unpaid:

• Disputed work quality — the head contractor claims defects or incomplete work
• Cash flow problems — the builder hasn’t been paid by the client yet
• Variation disputes — disagreement over whether extra work was authorised
• Retention withheld — the contract allows the head contractor to hold back a percentage
• Insolvency — the builder enters administration or liquidation

Check your contract and invoice terms first

Before you take any action, confirm:

• Payment terms — when was payment due? Net 7, 14, 30 days?
• Retention clause — does the contract allow the head contractor to hold back 5-10% until practical completion?
• Dispute resolution clause — does the contract require mediation or adjudication before court?
• Scope of work — is there any legitimate basis to claim the work was defective or incomplete?

If you’re outside the payment period and there’s no valid reason to withhold payment, you’re entitled to recover the debt.

Send a polite payment reminder

Start with a short, professional email or text:

> “Hi [Name], invoice [number] for [amount] was due on [date]. Can you confirm when payment will be made? Let me know if there’s an issue I need to address.”

The head contractor may have overlooked the invoice or their accounts person is behind. Give them 7 days to respond.

Issue a letter of demand

If the reminder doesn’t work, escalate to a formal letter of demand. This written notice:

• States the amount owed and the original due date
• Cites the contract or invoice terms
• Gives a final deadline (typically 7-14 days)
• Warns of further action if payment is not received

A properly drafted letter of demand shows you’re serious and often prompts immediate payment. It also creates a paper trail if you need to take further steps.

ClaimDone generates and sends a letter of demand automatically for $97. You complete a 5-minute form, our Proprietary AI Engine drafts the letter citing the applicable Australian law, and we deliver it to the head contractor by email and registered post. Most disputes settle at this stage.

Use security of payment laws (if applicable)

If your work falls under building and construction security of payment legislation, you have a fast-track right to payment adjudication.

What is security of payment?

Security of payment laws exist in every Australian state and territory to protect subcontractors. They allow you to:

• Serve a payment claim on the head contractor
• Receive a payment schedule in response (typically within 10 business days)
• Apply for adjudication if the payment schedule is inadequate or not provided
• Get a binding determination within 10-15 business days

The process is designed to be fast and affordable compared to court. The head contractor must pay the adjudicated amount even if they later dispute it.

When security of payment applies

Security of payment laws generally apply to:

• Construction work (building, fitting out, demolition, repair)
• Related goods and services supplied in connection with construction work
• Contracts between head contractors and subcontractors
• Contracts between subcontractors and sub-subcontractors

They typically do not apply to:

• Residential building work where the client is an individual occupier (in most states)
• Mining or offshore oil and gas work (in some states)
• Work outside the definition of “construction work”

If your work qualifies, security of payment adjudication is often the fastest and cheapest way to recover an unpaid subcontractor invoice.

Lodge a tribunal claim

If security of payment doesn’t apply, or the amount is under the adjudication threshold, your next step is the relevant state tribunal:

• NSW: NSW Civil and Administrative Tribunal (NCAT)
• VIC: Victorian Civil and Administrative Tribunal (VCAT)
• QLD: Queensland Civil and Administrative Tribunal (QCAT)
• WA: Magistrates Court (small claims)
• SA: South Australian Civil and Administrative Tribunal (SACAT)
• TAS: Magistrates Court (small claims)
• ACT: ACT Civil and Administrative Tribunal (ACAT)
• NT: Local Court (small claims)

Tribunal filing fees are low (typically $50-$300 depending on the claim amount), and you don’t need a lawyer. You present your evidence — contract, invoice, proof of work completed, correspondence — and the tribunal makes a binding decision.

ClaimDone prepares tribunal applications for a flat fee. We generate the application form, statement of claim, and witness statement based on the evidence you upload. You file it yourself and save thousands in legal fees.

Consider a statutory demand (if the debtor is a company)

If the head contractor is a registered company (Pty Ltd or Ltd) and owes you $4,000 or more, you can serve a statutory demand under the Corporations Act.

A statutory demand gives the company 21 days to:

• Pay the debt in full, or
• Apply to set aside the demand, or
• Face presumption of insolvency and potential wind-up proceedings

This is one of the most powerful debt recovery tools in Australia. Most companies pay immediately rather than risk insolvency proceedings.

ClaimDone prepares statutory demands and supporting affidavits for $197. The process is strict — any error can invalidate the demand — so it’s worth getting it done properly the first time.

What if the head contractor goes into administration?

If the head contractor enters voluntary administration or liquidation, your options change:

• Lodge a proof of debt with the administrator or liquidator
• Check if you have a valid retention of title clause in your contract (allows you to reclaim unpaid goods)
• Consider a personal guarantee if the director personally guaranteed payment
• Write off the debt if there are no assets and no guarantee

Subcontractors are typically unsecured creditors, meaning you rank behind secured creditors (banks) and employees. If the company has no assets, you may recover nothing.

How Claim Done helps tradies recover unpaid invoices

Claim Done is built for subcontractors who need to recover money fast without legal fees eating into the amount owed.

Letter of demand — $97 We draft and send a formal letter of demand citing the contract, invoice terms, and applicable law. Most disputes settle at this stage.

Tribunal application — from $197 We prepare the full application pack for NCAT, VCAT, QCAT, or your state tribunal. You file it yourself and avoid lawyer fees.

Statutory demand — $197 If the head contractor is a company and owes $4,000+, we prepare the statutory demand and supporting affidavit for service.

All services are flat-fee, no subscription, and completed within 60 minutes of you uploading your evidence.

Final tips for subcontractors

• Act fast — the longer you wait, the harder it is to recover
• Keep records — save every email, text, photo, invoice, and contract variation
• Don’t do more work — if you’re not being paid, stop working until the debt is cleared
• Check the company status — search the ASIC register to see if the head contractor is still trading
• Get a deposit next time — 30-50% upfront protects you from non-payment

Start your letter of demand today

If a builder or head contractor owes you money, start with a letter of demand. It’s fast, affordable, and settles most disputes without tribunal or court.

ClaimDone generates and sends your letter of demand automatically for $97. Complete a 5-minute form, upload your invoice and contract, and we’ll handle the rest. Flat fee, no subscription, done in 60 minutes.

Start your letter of demand now.

Frequently Asked Questions

Can I recover an unpaid subcontractor invoice if I don't have a written contract?

Yes. Even without a written contract, you can recover payment based on the invoice, text messages, emails, or an implied agreement. Australian law recognises verbal contracts and quantum meruit claims (payment for work done). A letter of demand or tribunal claim can still succeed if you can prove the work was completed and the amount owed.

How long do I have to recover an unpaid invoice in Australia?

The limitation period for debt recovery is generally 6 years from the date the debt became due. However, the sooner you act, the better your chances of recovery. If the head contractor enters administration or liquidation, you may have only weeks to lodge a proof of debt.

What is the difference between a payment claim and a letter of demand?

A payment claim is a formal notice under security of payment legislation, triggering strict timeframes and adjudication rights. A letter of demand is a general debt recovery notice that can be used in any situation. If your work qualifies under security of payment laws, a payment claim is faster and more powerful. If not, start with a letter of demand.

Can I charge interest on an overdue subcontractor invoice?

Yes, if your contract or invoice terms include an interest clause, or if you rely on the penalty interest rate under relevant state legislation. Always include an interest clause in your terms and conditions to maximise recovery.

What happens if the head contractor disputes the quality of my work?

If the head contractor raises a genuine dispute about defects or incomplete work, you may need to negotiate a resolution or provide evidence that the work meets the contract standard. A tribunal or adjudicator will consider both sides. If the dispute is a delaying tactic with no real basis, a letter of demand or adjudication will usually succeed.