--- title: Seven Red Flags and Prevention Tips for Detecting Accounts Payable Fraud url: https://www.medius.com/blog/seven-red-flags-and-prevention-tips-for-detecting-accounts-payable-fraud/ updated: 2025-03-07T06:15:25Z --- [Back to Blog](https://www.medius.com/blog/) Accounts Payable 8.15.2023 # Seven Red Flags and Prevention Tips for Detecting Accounts Payable Fraud If you feel like you’ve been hearing more and more about financial scams recently, there’s a reason: accounts payable fraud is a [growing threat](https://www.medius.com/blog/occupational-fraud-is-on-the-rise/ "Occupational fraud is on the rise"). Fraud can take many shapes – like invoice fraud, check fraud, vendor fraud, ACH fraud, and billing schemes. And, the list keeps growing with fraud attacks occurring from both [inside](https://www.medius.com/blog/occupational-fraud-is-on-the-rise/ "Occupational fraud is on the rise") and outside sources. Research from Ardent Partners in 2022 reveals that 38% fell victim to a business payment fraud attack in the past year. [Download Report](https://www.medius.com/resources/guides-reports/ardent-partners-2022-report/ "Ardent Partners 2022 Report") So, what's the solution? Arm yourself with knowledge. Identifying red flags in accounts payable is an empowering defense to safeguard your business from fraud. In this blog, we’ll explore seven common red flags that could alert your team of possible AP fraud and give you helpful prevention tips. ![pennant flag icon](https://www.medius.com/media/o1vf0mfl/flag-pennant-fill-red.svg)Red Flag #1: ## Unexplained vendor payment increases. If you notice a sudden or unexplained payment increase to a specific vendor but no apparent rise in goods or services, you might be looking at a billing scheme fraud. It’s a telltale sign that could indicate an attempt to siphon funds by colluding with a vendor or setting up a fictitious vendor account. **Prevention tips:** A [digital invoice system](https://www.medius.com/solutions/medius-accounts-payable-automation/ "Medius Accounts Payable Automation") can help automate and raise red flags automatically if something is off. Additionally, regularly conduct vendor audits to validate the legitimacy of vendors and the services they provide. Always double-check that payments align with the goods or services received, and stay in touch with your procurement team to ensure that all purchases are properly authorized. ![pennant flag icon](https://www.medius.com/media/o1vf0mfl/flag-pennant-fill-red.svg)Red Flag #2: ## Extraordinarily large payments to one vendor. Another red flag to watch out for is disproportionately large payment(s) to a single vendor. Fraudsters use this tactic to funnel funds to a fake vendor – or sometimes, the supplier and fraudster are conspiring together, and is known as a kickback scheme with the fraudster getting a “kickback” or portion of the funds for arranging and executing the set up. **Prevention tips:** It’s a good idea to have a multi-level approval process in place so that high-value transactions go through several levels of authorization, where different people in your organization will carefully review and verify them. With the help of [accounts payable automation software](https://www.medius.com/solutions/medius-accounts-payable-automation/ "Medius Accounts Payable Automation"), you can easily set up these parameters. This way, if something seems off, your team will be automatically notified. Interested in detecting accounts payable fraud before it occurs? Check out our Accounts Deceivable podcast. [Listen Now](https://www.medius.com/medius-podcast-series/ "Medius Podcast Series") [!\[Accounts Deceivable Podcast Series\](https://www.medius.com/media/frxbcx0d/accounts-deceivable-3.png?rmode=max&width=372&height=0&v=1d957adba886540)](https://www.medius.com/medius-podcast-series/) ![pennant flag icon](https://www.medius.com/media/o1vf0mfl/flag-pennant-fill-red.svg)Red Flag #3: ## Unusually large purchases on an employee’s company-issued credit card. Your team will definitely raise an eyebrow and your [AI-backed AP software](https://www.medius.com/solutions/medius-accounts-payable-automation/ "Medius Accounts Payable Automation") a flag if an employee with a company-issued credit card suddenly has an excessive purchase that wasn’t authorized or submits false expenses and claims –or reimbursement fraud– for purchases that don’t exist or fall outside company travel and expense policies. **Prevention tips:** With regular, detailed reconciliation of employee credit card expenses and [detection technology](https://www.medius.com/solutions/medius-accounts-payable-automation/ "Medius Accounts Payable Automation") to identify unusual patterns, you can stay ahead of unruly employees. Encourage everyone in your organization to report suspicious activities and strictly adhere to company credit card policies and implement a whistleblower process to protect anyone from potential retaliation. ![pennant flag icon](https://www.medius.com/media/o1vf0mfl/flag-pennant-fill-red.svg)Red Flag #4: ## Payments just under the authorization amount. A sly, common trick fraudsters use is keeping payments just below the threshold that requires higher-level authorization, helping them avoid scrutiny while stealing money. **Prevention tips:** Don’t let them fool you. Implement randomized checks or set up reports in your [AP automation software](https://www.medius.com/blog/ap-automation-benefits/ "Top 10 Benefits of Accounts Payable Automation") for payments below the authorization threshold. ![pennant flag icon](https://www.medius.com/media/o1vf0mfl/flag-pennant-fill-red.svg)Red Flag #5: ## Duplicate invoices. Double trouble in invoice fraud. Receiving multiple invoices for the same goods or services is a glaring indicator of potential AP fraud or a messy invoice process. Fraudsters might exploit this loophole to submit [duplicate invoices](https://www.medius.com/blog/duplicate-invoices/ "Duplicate invoices: What are they and how to prevent them") for payment, pocketing the excess funds. **Prevention tips:** Enforce a [robust, automated invoice-matching process](https://www.medius.com/solutions/medius-accounts-payable-automation/invoice-capture/ "Invoice Capture") where received invoices are cross-referenced with purchase orders and delivery receipts. With detailed approval setups for each invoice, duplicate invoices are immediately caught. [!\[fraud\](https://www.medius.com/media/r4gl0keg/ach-wire-transfer-business-fraud-electronic-fraud-prevention.jpeg?rmode=max&width=372&height=0&v=1d9172a5d66e530)](https://www.medius.com/medius-podcast-series/) Are you still fighting invoice fraud with one arm tied behind your back? Register for our Medius & AP Association Fighting Invoice Fraud webinar to give your AP team the best chance at fighting email and invoice fraud. We’ll explore all the red flags and what you can do to stay ahead. [Register Now](https://www.medius.com/resources/events-and-webinars/medius-apa-fighting-invoice-fraud/ "Register for webinar: Medius & APA - Fighting invoice fraud") ![pennant flag icon](https://www.medius.com/media/o1vf0mfl/flag-pennant-fill-red.svg)Red Flag #6: ## Unusual patterns in payment amounts. If you notice any anomalies or anything strange in payment amounts, like unexpected fluctuations, it could be a sign of fraud. **Prevention tips:** Use data analytics and monitoring tools to spot any weird payment patterns. [Automated systems](https://www.medius.com/solutions/medius-accounts-payable-automation/ "Medius Accounts Payable Automation") – and modern artificial intelligence – can highlight suspicious transactions for manual review and let you look at payment history overview for any window of time, allowing quick action when things don't add up. ![pennant flag icon](https://www.medius.com/media/o1vf0mfl/flag-pennant-fill-red.svg)Red Flag #7: ## Random spike in payments. Your red flag radar will go off if, suddenly, payments skyrocket, especially during off-peak periods. Fraudsters might exploit less busy times to push through unauthorized payments. **Prevention tips:** You can ward off fraudsters with a system that standardizes payments through a single channel – allowing you to set limits, easily monitor dashboards for sudden increases, and send automated alerts to your team. Since the pandemic, invoice fraud cases have seen a whopping 75% increase. But don't worry; with knowledge, policies, procedures, and [accounts payable automation software](https://www.medius.com/solutions/medius-accounts-payable-automation/ "Medius Accounts Payable Automation"), your AP team can be your first line of defense against fraud. You’ll not only be able to spot red flags —you’ll end fraud before it even happens. ## How Medius can help. Medius AP Automation Software and Medius Fraud & Risk Detection offer the ultimate protection for your organization's finances. Check out how you can harness the power of the latest AI and Machine Learning techniques to monitor risk events in your accounts payable process. [Get in touch](https://www.medius.com/contact-us/ "Contact Us") #### The Financial Professional Census Explore hurdles facing finance professionals today and learn how to overcome them in our research-backed Financial Professional Census report. [Get the report](https://www.medius.com/resources/guides-reports/financial-professional-census-report-2024/ "Financial Professional Census Report 2024") #### Ardent Partners' State of AP in 2026 AI is changing what AP teams can do, and fast. Get leading analysts at Ardent Partners' take on where the industry is headed. [Get the report](https://www.medius.com/resources/guides-reports/ardent-partners-state-of-ap/ "Ardent Partners State of AP") #### Webinar: Preparing for agentic AI in AP In this webinar with SSON, see how leading finance teams are moving from automation to autonomous AP, with real governance built in. [Watch the webinar](https://www.medius.com/resources/events-and-webinars/through-trust-and-governance-sson/ "Through trust and governance SSON") #### Discover accounts payable benchmarks Learn the efficiency metrics that matter for AP teams and the benchmarks derived from thousands of Medius customers around the globe. [Get the report](https://www.medius.com/resources/guides-reports/ap-benchmark-report/ "AP Benchmark Report") #### Watch a demo Get a first-hand look at Medius AP Automation, Analytics, and Pay with our 13-minute product demo. [Watch now](https://www.medius.com/watch-a-demo/#recorded "Watch a demo") ## Related Posts [8.10.2026 Accounts Payable Top finance and accounting conferences and events in 2026](https://www.medius.com/blog/top-finance-and-accounting-conferences-events/) [8.10.2026 AP Automation Best AP automation software for e-invoicing compliance](https://www.medius.com/blog/best-ap-automation-software-for-e-invoicing-compliance/) [8.7.2026 AP Automation Why manufacturing invoice matching creates so many exceptions](https://www.medius.com/blog/why-manufacturing-invoice-matching-creates-so-many-exceptions/) [8.6.2026 AP Automation Why global expansion creates AP complexity faster than expected](https://www.medius.com/blog/why-global-expansion-creates-ap-complexity-faster-than-expected/) [8.6.2026 AP Automation How can manufacturers improve invoice matching and PO matching?](https://www.medius.com/blog/how-can-manufacturers-improve-invoice-matching-and-po-matching/) [8.6.2026 AP Automation What happens when invoice matching fails in manufacturing?](https://www.medius.com/blog/what-happens-when-invoice-matching-fails-in-manufacturing/) Previous Next [View All Posts](https://www.medius.com/blog/) ## Ready to transform your AP? 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