Manual preparation • Australia
Additional invoice after the original was issued
Fictional worked example only. These are not real customer invoices, site revenue or payments.
When this pack helps
Your original invoice correctly describes the original work. Afterwards, a customer approves an additional visit or an extra purchase. You need to prepare a separate document without billing the original work twice.
This is a manual preparation record, not an invoice, credit note, payment receipt or permission to charge. If the original amount was wrong, use the appropriate correction process instead. Resolve uncertain approval, tax treatment and document requirements before sending anything.
1. KEEP THE ISSUED RECORD SEPARATE
Record the original invoice reference, issue date, customer code, billed scope and location of the issued file. Keep that issued file unchanged. An issued label does not prove the customer received or paid it.
Choose a distinct reference for any additional document and check your own register for conflicts. ABN Invoice does not automatically reconcile this worksheet with your account or check whether another document used the same reference.
2. REVIEW EVERY PROPOSED EXTRA
For each item, retain its work/purchase reference, date, description, customer approval reference and agreed amount. Match it against the original invoice and other issued records.
Separate these outcomes:
- Included in an earlier invoice: do not add that amount again.
- Approval or prior-billing history unclear: hold the item for investigation.
- Same customer, genuinely additional, agreed and not previously billed: consider it for the separate document after checking the source records.
Use consistent currency and tax basis throughout. No GST treatment, markup or payment deadline is inferred by this pack.
3. FILLED FICTIONAL EXAMPLE — AUD, NO GST AUTOMATICALLY ADDED
Customer code: DEMO-C1
Original invoice: DEMO-101, issued 20 October 2026, original total A$300.00.
Original scope: booked care visits, including the visit coded BASE-01.
Keep original issued file: DEMO-101-issued.pdf. Payment status: not established by this example.
Proposed additional reference: DEMO-102. This reference is illustrative, not an automatically reserved number.
| Reference | Proposed item | Amount | Approval evidence entered | Previously billed? | Review outcome |
|---|---|---|---|---|---|
| ADD-01 | Additional visit on 22 October | 30.00 | Fictional approval AP-21 | No, after manual register check | Consider for additional document |
| ADD-02 | Extra supplies purchased on 22 October | 24.00 | Fictional approval AP-22 | No, after manual register check | Consider for additional document |
| BASE-01 | Visit already included in DEMO-101 | 60.00 | Original booking | Yes | Exclude from additional document |
| HOLD-01 | Extra key trip | 16.00 | Unknown | No entered prior charge | Hold; no approval established |
Additional-only amount to review: A$30.00 + A$24.00 = A$54.00.
Original invoice remains A$300.00. Do not turn DEMO-102 into A$354.00.
Excluded already-billed proposal: A$60.00. Held proposal: A$16.00.
These figures do not establish the customer's balance due, payment status or tax liability. A fictional approval reference is not evidence for a real customer.
4. PREPARE THE CUSTOMER DOCUMENT MANUALLY
Open the original ABN Invoice tool at https://abninvoice.com.au/#app.
Start a separate document with the appropriate distinct reference, customer details, dates, reviewed additional lines and your independently confirmed tax/payment choices. Include a factual original-invoice reference where useful; it is context, not a second charge for the original amount.
Review the preview and export the PDF or image yourself. Keep both issued files and the review/approval evidence together. This pack does not read history, copy a document, import records, send email, collect money or update paid status automatically.
5. CUSTOMER MESSAGE — REPLACE ALL PLACEHOLDERS
Subject: [New reference] — additional agreed items for [booking reference]
Hello [customer],
Attached is [new reference] for the additional items agreed on [approval date/reference]: [brief descriptions]. The amount on this additional document is [amount, currency and confirmed tax basis].
Your original invoice [original reference] remains unchanged. The original work has not been added again to this document. [Explain any relevant relationship to the original document without stating an unverified payment status.]
Please check the details and let me know if anything differs from our agreement.
[Name / business]
SOURCE AND PRODUCT BOUNDARIES
An Australian supplier's public policy describes a separate invoice for added services and miscellaneous costs: https://www.hairypoppinspetsitting.com.au/terms-and-conditions.
A US provider's FAQ independently addresses additional invoices after a pet-sitting service period: https://www.kmpetsitting.com/faq.
Sources establish a real workflow, not endorsement, representative Australian demand, a universal fee, legal advice or a standard payment deadline. All worked amounts, references and messages above were independently prepared and are fictional.
Existing related tools: /approved-expense-invoice-coverage-checker-australia for expense coverage; /invoice-after-expense-approval-australia for a pre-send draft; /save-original-invoice-before-correction-australia for an erroneous original. This pack focuses on a correct original plus genuinely later work.
Prepared 26 October 2026. This is a manual preparation resource; it does not prove an invoice was issued or paid.
Keep a preparation copy
Try the invoice tool nowRelated records
Sources and review
Hairy Poppins supplier policy · KMPETSITTING FAQ (United States)
Reviewed 26 October 2026. Sources describe supplier practices, not endorsement or representative Australian search demand. Fictional amounts are independently prepared. ABN Invoice formats user-entered records and does not establish tax treatment, approval, delivery or payment.