The final invoice is the one the client is most likely to push back on. Once the deliverable has been handed over, leverage flips — they have what they came for and you have a receivable. Suddenly there are “minor concerns” that did not exist a fortnight ago, or simply silence where there used to be daily emails.
This pattern is so consistent across Australian project-based work that the legal framework around it is genuinely well-developed. You have stronger rights than the client is hoping you will exercise.
Why final invoices get disputed
Three patterns dominate. The client decides post-delivery that the price was too high and uses the final invoice as the only remaining lever to renegotiate. The client experiences cash-flow stress and triages payments to suppliers who can suspend service ahead of suppliers who cannot. The client invents disputes that should have been raised during the project, knowing that vague late-stage complaints can buy time. None of these survive a properly drafted Letter of Demand.
The right legal step
A Letter of Demand identifies the engagement, the scope agreed, the work delivered, the acceptance evidence (sign-offs, go-live, access granted, follow-on usage), the invoice particulars, and the legal basis for the debt under contract and applicable consumer or commercial law. It names the specific tribunal or court that will be invoked next and gives 14 days. The document is calibrated to remove the late-dispute defence by addressing the most common pretexts directly.
What Claim Done delivers
- Engagement, scope and delivery history captured precisely
- Acceptance evidence catalogued and referenced
- Citation of contractual and statutory bases including ACL services guarantees where relevant
- 14-day deadline with the specific tribunal or court named
- Drafted and sent on professional legal letterhead, flat $79
Common client pushbacks and why they fail
- “There are defects.” Defects must be specific, particularised in writing, and raised within a reasonable time — not at the final-invoice stage.
- “We never accepted it.” Use of the deliverable is acceptance for almost all practical purposes — live websites, distributed reports, deployed code speak for themselves.
- “Scope changed.” Variations are documented in writing or they do not exist. Late claims of scope creep do not defeat a final invoice.
- “Take a discount.” Discounts are negotiated, not unilaterally imposed at refusal time.
Next escalation if the demand is ignored
For most final invoices the next step is the small claims tribunal in your state (NCAT in NSW, VCAT in Victoria, QCAT in Queensland and equivalents) for amounts under the cap. Tribunal Application drafting and lodgement is $79 with Claim Done. For mid-size debts the Magistrates Court is the appropriate venue. For corporate clients and debts over $4,000, a Statutory Demand under section 459E of the Corporations Act 2001 is dramatically more powerful — a 21-day clock that creates a presumption of insolvency if unmet. A Final Demand ($79) is the short bridge step. The whole sequence is designed to be navigable without retainers or open-ended legal fees.