---
title: "How do accounts payable teams detect fake invoices?"
description: "Practical checks AP teams use to detect fake invoices: three-way matching, vendor master controls, duplicate checks, anomaly review and verifying bank details."
url: https://realpayee.com/answers/how-do-accounts-payable-teams-detect-fake-invoices
canonical: https://realpayee.com/answers/how-do-accounts-payable-teams-detect-fake-invoices
date_published: 2026-10-05
date_modified: 2026-10-05
author: RealPayee
---

# How do accounts payable teams detect fake invoices?

> AP teams catch fake invoices by refusing to pay anything that does not match a known vendor, an approved purchase order and a confirmed receipt (three-way matching), and by checking for duplicates, unusual amounts, new bank details and unfamiliar senders. The most damaging fakes reuse a real vendor, so any invoice that comes with new payment details should trigger out-of-band verification.

Most of this works with your existing ERP rules. The part software helps most with is consistent verification and records.

_Published 2026-10-05 · Updated 2026-10-05 · By RealPayee_

## Checks that catch most fake invoices

- **Known vendor only.** Invoices from vendors not in the vendor master file go through onboarding first. See the [vendor onboarding checklist](https://realpayee.com/blog/vendor-onboarding-checklist).
- **Three-way match.** Invoice, purchase order and goods or services receipt must agree.
- **Duplicate detection.** Same amount, same vendor, similar invoice number or date.
- **Bank details unchanged.** Any invoice showing different bank details from the vendor master file is a red flag, not an update.
- **Sender check.** Compare the sender domain and reply-to with the vendor's usual addresses.
- **Approval by the budget owner**, separate from the person entering the invoice ([segregation of duties](https://realpayee.com/blog/segregation-of-duties-accounts-payable)).

## Patterns worth reviewing monthly

- New vendors with round-number invoices and no purchase order.
- Vendors whose bank details changed in the last 90 days.
- Invoices just under approval thresholds.
- Payments to accounts in a different name or country from the vendor.

## Frequently asked questions

### Can AI detect fake invoices?

Anomaly detection can flag unusual invoices, and some AP suites include it. In the AFP 2026 survey only 17% of organizations used AI against payments fraud. Detection still needs a verification step before payment.

### What should happen when an invoice has new bank details?

Do not pay to the new details. Treat it as a bank change request and verify it with the vendor's known contact first. See [how to verify a vendor bank account change](https://realpayee.com/answers/how-to-verify-a-vendor-bank-account-change).

## Sources

- [AFP: 2026 Payments Fraud and Control Survey press release](https://www.financialprofessionals.org/about/learn-more/press-releases/Details/over-75-percent-of-us-firms-experienced-payments-fraud-in-2025-while-ai-adoption-for-fraud-mitigation-lags)

## Related

- [Vendor fraud: types, examples and how to prevent it](https://realpayee.com/vendor-fraud) - What vendor fraud is, the most common schemes (vendor impersonation, fake bank changes, fake invoices) and the controls that stop them. (markdown: https://realpayee.com/vendor-fraud.md)
- [Accounts payable segregation of duties: a practical matrix](https://realpayee.com/blog/segregation-of-duties-accounts-payable) - How to segregate duties in accounts payable, with a role matrix, small-team workarounds and the gap segregation of duties does not close: impersonation. (markdown: https://realpayee.com/blog/segregation-of-duties-accounts-payable.md)
- [Vendor onboarding checklist: a fraud-safe process for AP](https://realpayee.com/blog/vendor-onboarding-checklist) - A step-by-step vendor onboarding process and checklist for AP teams: what to collect, how to verify bank details, who approves, and what to log for audit. (markdown: https://realpayee.com/blog/vendor-onboarding-checklist.md)
- [What is a vendor bank change request scam?](https://realpayee.com/answers/what-is-a-vendor-bank-change-request-scam) - How the vendor bank change request scam works, why it succeeds, warning signs and the controls that stop it. (markdown: https://realpayee.com/answers/what-is-a-vendor-bank-change-request-scam.md)

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