Proposals · Glossary
What is a final invoice?
A final invoice is the last invoice on a job. It bills whatever is still owed after any deposit and progress invoices, plus or minus agreed variations, and closes the account once paid. It should show the contract price, everything already invoiced and paid, and the balance now due.
On a job billed in stages, the final invoice is where small differences pile up: a variation nobody wrote down, a deposit credited twice, an allowance that came in over budget. A clear reconciliation on the page prevents most of the arguments.
Indunil Asanka · Co-founder
4 min read · Published
| Line | Amount |
|---|---|
| Contract price | $12,000.00 |
| Approved variation: extra post and footing | $660.00 |
| Less deposit invoice INV-0112, paid | minus $2,400.00 |
| Less progress invoice INV-0118, paid | minus $6,000.00 |
| Balance due on this final invoice | $4,260.00 |
| GST included in the balance | $387.27 |
What the final invoice must reconcile
A final invoice is a summary of the whole job, not only a request for the last payment. It restates the agreed contract price, adds or subtracts approved variations and allowance adjustments, lists every earlier invoice by number with what was paid against it, and shows the balance. If the job is subject to GST, the invoice must still meet the tax invoice rules on its own: the ATO lists what an Australian tax invoice must include, and from $1,000 that includes the buyer's identity or ABN. The amounts must add up exactly, because the client will check them against their own payments.
How it differs from deposit and progress invoices
A deposit invoice asks for money before work starts. A progress invoice bills a completed stage, often against a schedule in the contract. The final invoice bills completion. In building work, state laws often tie the final payment to practical completion, and many contracts allow a retention amount to be held for a defects period, which then gets its own release invoice later. Queensland's QBCC Act, for example, limits the deposit a builder may take under a domestic building contract, so check your contract and your state's rules before issuing the final invoice.
When to send it
Send the final invoice when the work is complete as the contract defines it, not when the last tradesperson leaves. If there is a handover, inspection or sign off, send it straight after. Sending it with a short completion summary, photos or a handover document helps the client approve it quickly. If any item is still outstanding, either hold the invoice or deduct a fair amount and say what will trigger the remainder, rather than billing in full and arguing later.
Common mistakes
The most common mistake is billing the contract price again instead of the balance, which reads as a demand to pay twice. The second is leaving variations off because they were agreed verbally. The third is forgetting to credit a deposit taken through a different payment method. The fourth is changing the GST treatment at the end of a job, which makes the earlier invoices and the final one inconsistent.
Where it shows up in the product
When a client accepts a proposal that has a deposit, the proposals module creates an issued deposit invoice due that day and a draft balance invoice, which is the natural starting point for the final invoice. Edit the draft to reflect variations, then issue it. Without a deposit, acceptance creates one issued invoice due in 14 days. Every issued invoice is emailed to the signer, and the pay link offers Stripe Checkout when the owner has connected Stripe on a paid plan.
Questions people ask
Is a final invoice the same as a balance invoice?
In practice they are usually the same thing: the invoice that bills the remaining balance once a deposit or progress payments have been taken. Some businesses use balance invoice for a two stage job and final invoice for a multi stage one. What matters is that it reconciles the full price against everything already paid.
Can a final invoice be more than the quote?
Yes, if the contract allows it and the extra cost is explained, for example approved variations or allowances that came in over budget. Each addition should be listed with a reference to the agreement that permits it. An unexplained increase on the final invoice is the most common cause of payment disputes.
What if the client disputes one line on the final invoice?
Ask the client to pay the undisputed amount while the line is discussed, and confirm that in writing. Then resolve the disputed item with evidence: the variation request, photos, receipts or the original quote. Issuing a credit note for any agreed reduction keeps the original invoice and the record intact.
Should retention be on the final invoice?
If the contract allows a retention, show it on the final invoice as an amount held, so the balance due is clear, and state when it will be released. The release is then billed later on its own invoice, after the defects period, referring back to the final invoice and the contract clause that set the retention.
How long should a client have to pay a final invoice?
Use the payment term in the contract. Where none is set, 7 to 14 days is common for small jobs. In the UK, business payments with no agreed date are late after 30 days, and in Australia many building contracts set their own final payment terms, so check the contract before setting a due date.
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Step by step in the builder: Send a proposal and get paid, then Set invoice reminders.
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