Supplier Invoice Is Wrong: What AP Should Check Before Asking for a Credit Note or Replacement Invoice
Published August 2026 by Solarc Labs
Start with the exact invoice, not the number someone copied into a spreadsheet
Before contacting the supplier, preserve the exact source PDF or invoice record and identify the disputed field: supplier identity, invoice number, date, line amount, total, tax, duplicate reference or another concrete mismatch. Compare the source document with the supporting evidence your process actually uses. An extracted value is a review aid, not ground truth. If OCR, parsing or manual entry introduced the mismatch, asking the supplier to correct a valid invoice creates a new problem instead of fixing the first one.
Separate a source-document error from an internal approval question
Not every held invoice is wrong. Sometimes the invoice is internally awaiting evidence, ownership or approval. Sometimes the supplier document itself contains the incorrect amount or tax. Keep those states separate so the supplier is only asked to change a document when the source invoice actually needs correction. For UK VAT specifically, HMRC says that when VAT on an invoice received is too high or too low, the customer should go back to the supplier for a replacement invoice. HMRC guidance also uses credit and debit notes to document genuine corrections or changes to previously issued invoices.
Ask for one specific correction and show the evidence behind it
A useful discrepancy message identifies the invoice, the exact field or amount in question, what your evidence shows and the requested next step. Depending on the situation, that may be a corrected or replacement invoice, a credit note, confirmation that a possible duplicate should be cancelled, or an explanation that resolves the exception. Do not bury the discrepancy in a long generic complaint. The supplier should be able to see what you believe is wrong and what document or answer would allow your review to continue.
Do not edit the supplier invoice to make your records look right
The safer accounting trail is to preserve the original document and the supplier-issued correction. HMRC guidance on VAT records requires credit or debit notes to retain identifying information and the reason for the change, and its error-correction guidance directs customers back to suppliers when VAT on a received invoice is incorrect. Keep the original invoice, the discrepancy evidence, the supplier response and the corrected document together so a later reviewer can reconstruct what happened.
Payment treatment is a policy and contract decision, not an extraction rule
Whether your team pays an undisputed portion, pauses the whole invoice or follows another route can depend on contract terms, accounting policy, tax treatment and internal controls. An invoice-review tool should not invent those rights from the document. Escalate material commercial or tax questions to the responsible finance or professional owner. InvoiceGuard can focus a reviewer on extracted fields and deterministic exceptions while retaining the exact PDF. It does not decide contractual liability, alter supplier invoices, post accounting entries, issue credit notes or make tax determinations.
Close the loop only after the corrected evidence is reviewed
When a replacement invoice, credit note or explanation arrives, review that new evidence rather than marking the original exception resolved merely because the supplier replied. Record the final human decision and retain the source trail. That turns a vague “invoice problem” into a reproducible process: source invoice, exact discrepancy, supporting evidence, correction request, supplier response, corrected document and final review.
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