Contractor Didn’t Sign Agreement: Can You Enforce Payment?

You engaged an independent contractor. They did the work. You sent invoices. Now they’re refusing to pay—or claiming there was never any agreement because they never signed anything.

Under Australian contract law, a signature is not required for a contract to be enforceable. If you can prove the essential terms were agreed and the contractor acted on them, you likely have a binding contract.

Do you need a signed contract for it to be enforceable?

No. A contract is formed when there is:

• Offer — one party proposes terms
• Acceptance — the other party agrees
• Consideration — something of value is exchanged
• Intention to create legal relations — both parties intended to be bound

A signature is evidence of acceptance, but not the only evidence. If a contractor started work, sent invoices, accepted payment, or confirmed agreement via email, those actions can prove acceptance.

The question is not “Did they sign?” but “Did they agree and act on the terms?”

How unsigned contracts are proven

Australian courts regularly enforce unsigned contracts based on the parties’ conduct.

Evidence that proves an unsigned contract

Emails or text messages — written communication where the contractor acknowledged the terms, agreed to a rate, or confirmed the scope of work.

Invoices — if the contractor sent invoices reflecting the agreed rate or payment terms, that’s strong evidence they accepted those terms.

Conduct — if the contractor performed the work as described, that’s acceptance by performance.

Payment history — if you’ve paid the contractor previously under the same terms without dispute, that establishes a pattern of agreement.

Quotes or proposals — if the contractor provided a quote and you accepted it, or vice versa, that exchange can form a binding contract.

What if the terms were only discussed verbally?

Verbal contracts are legally binding in Australia. The challenge is proving what was agreed. If you have follow-up emails summarising the conversation, text messages confirming rates or deadlines, invoices that match what was discussed, or witnesses who heard the conversation, you can still enforce the agreement.

The standard of proof is balance of probabilities—more likely than not that the terms were agreed.

What if the contractor disputes the payment terms?

If a contractor claims they never agreed to your payment terms, you need evidence that contradicts their claim.

Common contractor defences and how to counter them

“I never agreed to those rates” — counter with emails where they quoted that rate, invoices they sent using that rate, or prior payments they accepted without objection.

“There was no agreement at all” — counter with the fact they performed the work, sent invoices, or communicated about the project as if a contract existed.

“The terms were unclear” — counter with contemporaneous documents (emails, quotes, invoices) showing both parties operated under the same understanding.

“I was going to negotiate but never got around to it” — counter with the fact they continued working without raising any objection, which implies acceptance.

If the essential terms (who, what, how much, when) are clear enough for the contract to be performed, courts will typically enforce it.

How to enforce payment when there’s no signed agreement

If a contractor refuses to pay or claims there was no agreement, follow this process:

Step 1: Gather your evidence

Collect everything that proves the agreement:

• All emails, texts, or messages between you and the contractor
• Invoices you sent or they sent
• Quotes, proposals, or scope-of-work documents
• Records of work performed (timesheets, deliverables, project files)
• Payment records showing prior transactions under the same terms
• Any written acknowledgment of the debt

Step 2: Send a letter of demand

A letter of demand is a formal written notice requiring payment within a set timeframe (typically 7-14 days). It should state the amount owed, cite the agreement and supporting evidence, reference the work performed and invoices issued, and warn of legal action if payment is not made.

ClaimDone generates a letter of demand automatically based on the evidence you upload. The Proprietary AI Engine analyses your emails, invoices, and conduct evidence to draft a legally precise letter—and sends it to the contractor on your behalf.

Step 3: File in the relevant tribunal if they don’t pay

If the contractor ignores your letter of demand, you can file a claim in your state’s tribunal (VCAT, NCAT, QCAT, etc.). For amounts under $10,000, most states offer a small claims process.

You will need to prove an agreement existed via the evidence above, the contractor breached it by not paying, and the amount you’re owed.

Tribunals are designed for self-represented parties. You do not need a lawyer, but you do need organised evidence.

What if you want to avoid this situation in future?

The best way to avoid disputes over unsigned contracts is to make acceptance clear and documented from the start.

Best practices for independent contractor agreements

Send a written agreement before work starts — even a simple one-page document covering rate, scope, payment terms, and termination rights.

Require written acceptance — ask the contractor to reply “I accept these terms” via email, or use an electronic signature tool.

Confirm terms in the first invoice — include a line like “Payment terms as agreed: $X per hour, net 14 days.”

Keep a paper trail — save every email, quote, and message that touches on the terms of engagement.

Use ClaimDone’s Independent Contractor Agreement service — upload the project details, and the Proprietary AI Engine generates a compliant agreement covering payment terms, IP ownership, confidentiality, and termination rights. It’s formatted for signing and costs $97 flat.

How ClaimDone helps when a contractor didn’t sign an agreement

If you’re owed money by a contractor who claims there was no agreement, ClaimDone can help you enforce payment:

Letter of Demand — upload your emails, invoices, and any evidence of the agreement. ClaimDone’s Proprietary AI Engine drafts a letter citing the principles of contract formation and the evidence proving the terms. The letter is sent automatically to the contractor via registered post and email. $79 flat fee.

Independent Contractor Agreement — for future engagements, generate a compliant contractor agreement in minutes. The system tailors it to your project, includes payment terms, IP clauses, and confidentiality provisions, and formats it for signing. $97 flat fee.

Both services are completed within 60 minutes. No subscription. Australia-wide.

Final thoughts: unsigned doesn’t mean unenforceable

A contractor’s refusal to sign an agreement—or their later claim that no agreement existed—does not erase the contract if you can prove the terms through conduct, emails, and invoices.

If you did the work, sent the invoices, and the contractor accepted the benefit of your services, you likely have a contract. The key is evidence. Gather it, organise it, and enforce it.

Enforce your payment terms with ClaimDone

If a contractor didn’t sign an agreement but owes you money, ClaimDone’s AI-powered letter of demand service gets you paid fast. Upload your evidence, and we’ll draft and send a legally precise demand letter within 60 minutes.

Start your letter of demand now — $79 flat fee, no subscription, Australia-wide.

Frequently Asked Questions

Can I enforce a contract if the contractor never signed it?

Yes. Australian contract law does not require a signature if you can prove agreement through conduct, emails, invoices, or other evidence. If the contractor performed the work or accepted payment under the terms, that demonstrates acceptance.

What evidence do I need to prove an unsigned contract?

Emails or messages discussing the terms, invoices reflecting the agreed rate, records of work performed, payment history, quotes or proposals, and any written acknowledgment of the agreement. The more contemporaneous documentation you have, the stronger your case.

What if the contractor claims they never agreed to my payment terms?

You counter their claim with evidence: emails where they quoted rates, invoices they sent using those rates, prior payments they accepted without objection, or the fact they continued working without raising any dispute. Courts assess the balance of probabilities.

Can I take a contractor to tribunal without a signed contract?

Yes. Tribunals like VCAT, NCAT, and QCAT regularly hear disputes over unsigned contracts. You will need to prove the agreement existed through evidence of conduct, communication, and performance. Organised documentation is critical.

How do I avoid this problem in future contractor engagements?

Send a written agreement before work starts, require written acceptance via email or e-signature, confirm terms in your first invoice, and keep all communication documented. ClaimDone’s Independent Contractor Agreement service generates a compliant agreement in minutes for $97.