Subcontractor Demanding Payment Without Completing Work: Your Legal Response Options

You hired a subcontractor. They didn’t finish the job — or finished it badly. Now they’re demanding full payment anyway, threatening legal action if you don’t pay. This happens regularly in construction, trades, consulting, and service industries across Australia. You have legal defences, and you don’t have to pay for work that wasn’t done or wasn’t done properly.

This guide explains your rights when a subcontractor demands payment for incomplete work, what defences apply, and how to respond in writing to protect your position.

Why subcontractors demand payment for incomplete work

Subcontractors issue payment demands for several reasons:

• Cash flow pressure — they need money now, even if the job isn’t finished
• Dispute over scope — they believe the work is complete under their interpretation of the contract
• Poor project management — they’ve moved on to another job and want to close out your invoice
• Misunderstanding of milestones — they think a stage payment is due, even though deliverables aren’t met
• Intimidation tactic — hoping you’ll pay to avoid conflict or legal costs

A demand letter does not create an obligation to pay. You are entitled to dispute the amount, the quality, and the completion status.

Your legal defences when work is incomplete

Australian contract law gives you several defences when a subcontractor demands payment without completing the agreed work.

Incomplete performance

If the subcontractor has not finished the work described in the contract or purchase order, you are not obliged to pay the full amount. A party who fails to complete their contractual obligations cannot demand full payment.

You may owe payment for the fair value of work actually done, but not the contract price.

Defective work

If the work completed is defective, substandard, or does not meet the agreed specifications, you have a defence based on breach of contract. The subcontractor has failed to deliver what was promised.

You are entitled to:

• Withhold payment until defects are rectified
• Deduct the cost of fixing the defects from the amount owed
• Refuse payment entirely if the defects are so serious the work has no value

Set-off and counterclaim

If the subcontractor’s incomplete or defective work has caused you loss — additional costs to hire someone else, project delays, lost revenue — you can raise a set-off or counterclaim against their demand.

Example: The subcontractor claims $8,000. You had to pay another contractor $5,000 to finish the job. You can set off that $5,000, reducing what you owe to $3,000 (or potentially nothing, depending on the value of work actually completed).

No written contract or unclear scope

If there was no written contract, or the scope was vague, the subcontractor cannot simply demand an arbitrary amount. They must prove what work was agreed, what work was completed, and the reasonable value of that work. Without clear evidence, their claim is weak.

What NOT to do when you receive a payment demand

Before we get to the correct response, here’s what makes your position worse:

• Ignoring the letter — silence can be interpreted as acceptance or weakness
• Paying under pressure — once you pay, it’s very hard to get the money back
• Sending an angry, emotional reply — this can be used against you in court or tribunal
• Admitting the full amount is owed — even casually (“yeah I know I owe you, just give me time”)
• Making partial payments without a written agreement — this can be seen as acknowledging the debt

You need a written response that is clear, factual, and legally defensible.

How to respond to a subcontractor’s payment demand

A proper response does four things:

1. Acknowledges receipt of the demand
2. Disputes the amount claimed and explains why
3. Sets out your defences — incomplete work, defects, set-off
4. States your position on what (if anything) you believe is owed

What to include in your response

Identify the contract or agreement — refer to the purchase order, quote, email chain, or verbal agreement that formed the contract.

List what was agreed vs what was delivered — be specific. “You were contracted to install 12 downlights. Only 8 were installed, and 3 of those are flickering.”

Describe defects or incomplete items — use plain language, attach photos or inspection reports if available.

State your calculation — if you believe some payment is owed, say how much and why. If you believe nothing is owed, say that clearly.

Invite them to rectify or negotiate — you’re being reasonable, not just refusing to pay.

Set a deadline for their response — typically 14 days.

Example structure

> “I refer to your letter of demand dated [date] claiming $[amount]. > > I dispute this claim. The contract required [describe scope]. You have completed [describe what was done], which does not satisfy the contract. > > Specifically: > – [List incomplete items] > – [List defects] > > I have incurred $[amount] in costs to rectify these defects / complete the work. > > I am prepared to pay $[amount] in full and final settlement, representing the fair value of work actually completed to an acceptable standard. > > Alternatively, you may return to site and complete the work in accordance with the contract by [date]. > > Please confirm your position within 14 days.”

This approach is firm but professional. It shows you’ve considered the claim seriously and you’re not simply refusing to pay out of spite.

When you might owe something (and when you don’t)

You likely owe a fair value amount if:

• The subcontractor did some work, even if incomplete
• That work has some value to you
• There’s no serious defect that makes the work worthless

You may owe nothing if:

• The work is so defective it has to be completely redone
• The subcontractor abandoned the job without notice
• You’ve already paid more than the value of work completed
• The subcontractor breached a fundamental term (e.g., used non-compliant materials)

You should pay the full amount if:

• The work is actually complete and compliant
• Your complaint is about minor cosmetic issues
• You’re withholding payment for reasons unrelated to the contract

Be honest in your assessment. Courts and tribunals can see through bad-faith refusals to pay.

What happens after you send your response

The subcontractor will either accept your position and negotiate a reduced amount or return to finish the work, reject your position and escalate to tribunal or court, or do nothing — in which case the matter may quietly close.

If they escalate to a tribunal (VCAT, NCAT, QCAT, etc.), your written response becomes critical evidence. It shows you disputed the claim early, you had legitimate reasons, and you were willing to negotiate. Tribunals typically favour parties who communicate clearly and in writing.

How ClaimDone helps you respond to unfair payment demands

ClaimDone’s Legal Response service generates a professionally formatted response to any payment demand, letter of demand, or legal threat — tailored to your situation.

You upload the demand letter, describe what actually happened, and our Proprietary AI Engine drafts a response that disputes the amount claimed with specific reference to the contract and the facts, sets out your defences (incomplete work, defects, set-off), calculates what (if anything) you believe is owed, invites negotiation or rectification, and protects your position if the matter goes to tribunal.

The response is generated in 60 minutes, delivered as a PDF and Word document, ready to send by email or post. Fixed fee: $97. No subscription. Australia-wide.

If the matter escalates to tribunal, ClaimDone can also prepare your Tribunal Response and Defence Pack with all the evidence, submissions, and witness statements you need.

Final checklist: Responding to a subcontractor payment demand

• [ ] Do not ignore the letter
• [ ] Do not pay the full amount if the work is incomplete or defective
• [ ] Gather evidence: contract, emails, photos, quotes for rectification
• [ ] Calculate what you actually owe (if anything)
• [ ] Send a written response disputing the claim and setting out your defences
• [ ] Keep copies of everything
• [ ] Set a deadline for their reply
• [ ] Be prepared to negotiate or defend in tribunal if needed

You are not obliged to pay for work that wasn’t done. Respond clearly, factually, and in writing — and protect your position from the start. Generate a Legal Response to a payment demand through ClaimDone in under an hour.

Frequently Asked Questions

Can a subcontractor sue me if I don't pay for incomplete work?

Yes, they can file a claim in a tribunal or court. However, if the work is genuinely incomplete or defective, you have strong defences. A written response disputing the claim early strengthens your position and often leads to negotiation rather than litigation.

Do I have to pay anything if the subcontractor didn't finish the job?

You may owe the fair value of work actually completed to an acceptable standard. You don’t owe the full contract price, and you can deduct the cost of defects or completion by another contractor.

What if there was no written contract with the subcontractor?

A verbal agreement or email exchange can still form a binding contract. However, without clear written terms, the subcontractor must prove what was agreed and what was delivered. This makes their claim harder to enforce, and your defences stronger.

How long do I have to respond to a payment demand?

There’s no strict legal deadline, but responding within 14 days shows you’re taking the claim seriously. Ignoring the letter can weaken your position if the matter goes to tribunal, as it may appear you had no defence.

Can I withhold payment until defects are fixed?

Yes. If the work is defective or incomplete, you are entitled to withhold payment until the subcontractor rectifies the defects or you deduct the cost of fixing them yourself. Document everything and communicate your position in writing.