Accounts Payable
Part of Accounts payable software
Preventing duplicate supplier invoices
Stop a resent or re-entered supplier invoice becoming a second payable, and investigate possible duplicates before payment.
Before saving a supplier bill or preparing payment, check whether the charge is already recorded. Search by supplier, invoice reference, amount and source document, then decide whether the new arrival is a resend, replacement, credit or separate charge. A software warning is a prompt to investigate, not proof that every duplicate has been caught.
Key facts about duplicate invoice risks in Australian accounting
- Common cause of duplicate payments
- Resent or re-entered invoices without proper checks
- Amount alone is weak evidence of duplication
- Two genuine deliveries can cost the same
- Best practice: Always verify before payment
- Even if software flags a possible match
Check at intake
Give supplier invoices a defined arrival route. Review items that reach staff through other channels. The same invoice might be emailed to a manager and forwarded to an upload address. Record which copy became the bill, then attach or cross-reference later copies instead of creating another payable.
Before creating a bill, search draft, unpaid and paid records. Try supplier name variants, the supplier's invoice number, purchase order or contract reference, issue date and amount. Inspect the underlying document when a reference is incomplete. Amount alone is weak evidence: two genuine deliveries can cost the same.
| Similar-looking item | Check before deciding |
|---|---|
| Same document resent | Compare the invoice reference, dates, lines and file; link it to the existing bill where appropriate. |
| Revised invoice | Confirm whether it replaces the first invoice or adds another charge, and retain the correction trail. |
| Credit note | Identify the charge it adjusts and record it as a credit, rather than another positive payable. |
| Recurring charge | Compare the service period as well as supplier and amount. |
| Same invoice through two routes | Find which route created the payable and whether it was already paid. |
Handling similar-looking invoices: What to do in each case
- Same document resentCompare invoice reference, dates, lines and file; link to existing bill
- Revised invoiceConfirm if it replaces the first invoice or adds another charge; retain correction trail
- Credit noteIdentify the charge it adjusts and record as a credit, not a payable
- Recurring chargeCompare service period, supplier and amount to avoid duplication
- Same invoice through two routesDetermine which route created the payable and whether it was already paid
Review software prompts in context
Xero's Australian bill page describes automatic duplicate-bill flags. QuickBooks' Australian upload guidance says an uploaded bill may be matched to an existing transaction or used to create a new one. MYOB Business lets a user link an uploaded document to an existing bill instead of creating a new bill.
These are different controls. None guarantees that every resend or revised invoice will be recognised.
When a warning or possible match appears, inspect both records. A supplier may reuse a short reference for different branches or periods, while a replacement invoice may use a new reference for the same purchase.
Record why the second item was linked, held, corrected or accepted as a separate charge. Check the payable list afterwards: removing an upload does not establish that another payable elsewhere was removed.
Pros and cons of relying on software duplicate detection
- ProsAutomated flags help identify potential duplicates quickly; reduces manual effort
- ConsNo system guarantees every duplicate is caught; false positives occur with reused references
Check again before payment
Compare payment candidates with the approved bill list. Look for two unpaid bills representing one invoice, a charge already settled by card, or a payment sent but not yet visible in the bank feed. Hold uncertain items with an owner. Do not delete a bill solely because another has the same amount.
If two payables were recorded, establish which reflects the supplier's claim, whether either was paid or included in a reported period, and which approval applies. Ask the finance owner or accountant to choose a traceable correction. Recheck the supplier balance and affected payments afterwards. Keep the documents and reason for the correction so another reviewer can see how the charge was handled.
