Should this supplier invoice be entered twice?
Enter it twice only if the two invoices represent separate, verified charges. Compare the supplier, invoice reference, date, amount and currency, then check the purchase order, delivery records and ledger. If you cannot explain the difference, hold the invoice for review before posting or paying it.
What Makes an Invoice a Duplicate?
A duplicate invoice is a second copy or entry for a charge already recorded. A supplier might resend an invoice as a payment reminder, or the same document might reach both the purchasing team and the accounts inbox. A genuine second bill, by contrast, covers a separate delivery, service period or contract milestone.
When reviewing duplicate supplier invoices in the UAE, use matching amounts as a reason to check, not a reason to reject a bill. Two monthly service charges can have identical totals. Equally, a different invoice number does not prove a new charge: a supplier may reissue a bill with a new reference.
| What you find | What it could mean | What to check next |
| Same supplier, reference and amount; different email dates | The same invoice was resent | Find the existing ledger entry and check its payment status. |
| Same supplier and amount; different delivery notes | Two legitimate deliveries | Match each invoice to a separate goods receipt. |
| Different reference; same work and service period | A revised bill or a possible duplicate | Ask the supplier whether the new invoice replaces the first. |
| Same reference; different amount or currency | A correction, data-entry error or conflicting version | Compare the source documents and ask which version is valid. |
Supplier Invoice Review Checklist
1. Search the ledger before creating a new entry
Compare the supplier’s legal name or vendor ID, invoice reference, invoice date, total and currency. Search for minor reference variations too: INV-0042 and INV0042 may be the same invoice entered differently.
Check whether the supplier has more than one vendor record. A duplicate invoice check may miss an earlier entry if it sits under a different spelling or account. Look at posted invoices, pending approvals and scheduled payments.
2. Match the charge to the work or delivery
Compare the invoice with the purchase order, delivery note, goods receipt, service period or approved milestone. Check quantities and line items as well as the total.
A purchase order can cover several deliveries, so the same purchase order number alone does not establish duplication. Look for evidence of what was delivered or completed and what has already been billed against the order.
3. Put unclear invoices on hold
If you cannot verify a separate charge, flag the invoice before posting it or releasing payment. Record why it is on hold and assign someone to follow up before the payment due date.
Ask the authorised buyer, project manager or accounts lead to confirm the underlying charge. If you need the supplier’s explanation, contact them through details already held in your vendor records or otherwise independently verified. For a revised bill, ask for written confirmation of which invoice remains payable.
4. Record the decision and follow through
Save both versions, the supporting records, the reviewer’s name, the date and the reason for the decision. If a new invoice replaces an earlier one, link the two references so someone reviewing the ledger later can follow what happened.
- Already posted but unpaid: Notify accounts payable, check whether either entry is in a payment run, and ask the authorised reviewer to approve any correction.
- Already paid: Verify whether two payments actually left the bank. If they did, give finance the invoice and payment references so it can confirm the overpayment with the supplier and agree how to recover it. Keep the item open until the resolution is documented.
Three Hypothetical Examples
Example 1: An Invoice Resent by Email
A cleaning supplier sends invoice CL-118 for AED 2,400 on Monday and resends it on Thursday. The reference, service period and amount match an entry already in the ledger. The bookkeeper links the second email to that entry and checks whether payment is pending. No second bill is posted.
Example 2: Two Genuine Bills for Different Deliveries
A packaging supplier issues two AED 3,000 invoices against the same purchase order. The warehouse confirms two separate deliveries, each with its own goods receipt. After checking the quantities and confirming neither delivery has already been billed, accounts payable processes both invoices.
Example 3: A Revised Invoice with a New Reference
An IT contractor sends IT-226-R after issuing IT-226. Both describe the same work, but the revised version includes a different total. The reviewer holds payment and asks the supplier which invoice is payable. If the first is already posted, the reviewer escalates the correction and links both documents to the decision.
Frequently Asked Questions
1. Do identical invoice amounts mean one is a duplicate?
No. Recurring services and repeat deliveries can have identical prices. Check the service periods, delivery records and ledger entries.
2. Can two invoices use the same purchase order?
Yes. One order may cover multiple deliveries or milestones. Match each bill to the specific charge and review what has already been invoiced.
3. What if the supplier sends the same invoice with a new number?
Hold it for review if the underlying charge appears unchanged. Ask whether the new invoice replaces the first or covers separate work.
4. What should I do if a duplicate has already been paid?
Confirm both bank payments, escalate the issue to finance and contact the supplier through a verified channel. Retain the payment evidence and track the agreed resolution.
5. Should I delete a duplicate invoice from the inbox?
Keep it linked to the original entry or review record. That trail helps colleagues understand why the second copy was not posted or paid.
