Is this invoice a duplicate? A review before payment

Applies to: General bookkeeping workflow for U.S. and Canadian businesses; illustrative controls, not tax or legal advice.

A supplier sends an invoice PDF, then sends it again with a slightly different file name. Your inbox now contains two documents. The bookkeeping question is whether there are two obligations. A short comparison before payment helps the team answer that question without relying on memory.

Compare the underlying transaction

Start with the supplier record already used in the books. Compare the invoice number, issue date, amount, currency, purchase reference and service period. A matching amount alone is weak evidence: monthly subscriptions and recurring deliveries often repeat the same value. A changed file name alone is also weak evidence that a charge is new.

The IRS recordkeeping guidance describes supporting documents such as invoices and receipts. Keep those documents connected to the entry you are reviewing. The comparison process below is an original operational checklist, rather than an IRS-prescribed procedure.

A practical exception checklist

• Search open and paid bills, including older supplier names or duplicate supplier records.
• Compare the purchase or delivery evidence with the charge.
• Check whether the later document replaces an earlier version, corrects it, or is only a reminder.
• Look for a payment reference and bank evidence before marking a bill paid.
• Assign an owner to contact the supplier through a known channel when the evidence is incomplete.
• Record the conclusion and link the supporting documents before releasing or correcting the item.

Example: two documents, one unanswered question

Imagine a business receives invoice INV-417 for $840 and, a week later, INV-417-R for the same amount. The suffix could indicate a replacement, but that has not been established. The reviewer finds that the first invoice is still open and both documents describe the same delivery. The team holds the second item for clarification and asks which document is valid. It does not invent a credit or assume a second delivery occurred.

A simple exception record can contain the two references, the amount, the reviewer, the supplier’s explanation and the approved action. This makes the decision easier to inspect during a later bookkeeping review.

Questions about duplicate invoices

Should matching amounts always be blocked?

No. Treat a match as a review signal. Recurring charges can have identical amounts but cover different periods.

Should I delete the second PDF?

Keep the evidence while resolving the issue. Follow the business’s approved recordkeeping process for corrected entries and superseded documents.

What if both items were already paid?

Document the two payments and ask the responsible reviewer to confirm the supplier balance and any agreed recovery. Do not record an assumed refund as received cash.

Prepared by The Solution Bridge. Sources checked 2026-10-02. Educational guidance; verify current product instructions and applicable requirements.

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