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How to prevent accounts payable fraud schemes

How to prevent accounts payable fraud schemes

Emily Taylor
Contributing writer, BILL
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Concerned about accounts payable fraud? You're not alone. According to J.P. Morgan, at least 71% percent of companies fell victim to payments fraud via email in 2022.

However, by developing clear strategies and using modern technology to implement AP best practices, you can safeguard your organization against potential fraud schemes. Here's how.

Key takeaways

Accounts payable fraud can come from both external sources, such as vendors, and internal sources, like employees.

Common examples of accounts payable fraud include business email compromise, payment-related change requests, and check theft or tampering.

Implementing strong fraud prevention measures and using AP automation solutions can significantly reduce the risk of fraud.

What is accounts payable fraud?

Accounts payable fraud (AP fraud) refers to any fraudulent financial activity that targets or exploits an organization's accounts payable system. This can include internal fraud committed by employees, external fraud by vendors or cybercriminals, or a combination of both. 

External accounts payable fraud

External accounts payable fraud involves fraudulent activities perpetrated by entities outside the organization. Examples include business email compromise, payment-related change requests, gift card scams, phishing scams, phony invoices, and check theft or tampering. These schemes can result in financial losses and can damage vendor relationships.

Internal accounts payable fraud

Internal AP fraud occurs when employees engage in fraudulent activities related to accounts payable processes. Common examples of internal fraud include check theft and tampering, colluding with suppliers, submitting false expense reports, altering invoices, setting up fake vendors, and using cards for personal gain. Internal fraud poses a significant risk due to employees' access to sensitive financial information.

What increases the risk of AP fraud?

Several factors can increase the risk of accounts payable fraud within an organization. Here are a few of the most common mistakes to avoid.

Relying too much on trust

Trusting employees is essential for a harmonious work environment. However, relying too heavily on trust can create opportunities for fraud. Financial troubles or the allure of easy money may tempt even the most trustworthy individuals to engage in fraudulent activities. Implementing fraud controls, such as regular audits and oversight, can help mitigate this risk.

Weak signature controls

In organizations where manual sign-off processes are used, such as rubber stamps or "wet signatures," there is a higher risk of fraud. Stamps can be easily misused or lost, while signatures can be forged or altered over time. To reduce this risk, implement stronger signature controls, such as digital signatures or multi-level approval processes that require more than one set of eyes on contracts and invoices.

Lack of separation of duties

Having the same individual or group responsible for multiple key duties within the accounts payable process can increase the risk of fraud. Instead, implementing clear roles and responsibilities can prevent individual employees from having too much control over financial transactions, making it harder for them to commit and conceal fraudulent activities.

Control gaps

Control gaps often let fraud go undetected for extended periods of time. Failing to conduct regular checks and reviews of financial processes can create opportunities for fraudsters to exploit weaknesses in the system. To close those control gaps and help prevent fraud, establish a clear chain of command, conduct internal audits, and implement a regular schedule for reconciling accounts.

Lack of automation in accounts payable processes

Manual accounts payable processes are not only inefficient and time-consuming but also increase the risk of fraud. Physical invoices and documents are easier to forge or alter, making it harder to detect fraudulent activities. Implementing automated accounts payable systems can streamline processes, improve accuracy, and provide instant visibility into financial transactions.

AP fraud red flags

Common types of accounts payable fraud

Below is a list of AP fraud methods you're most likely to encounter. By being aware of these common types of AP fraud, such as check fraud, and taking proactive steps to prevent and detect them, you can help safeguard your financial assets and reputation.

Check theft and tampering: Fraudsters may steal checks and alter the payee or amount to redirect funds into their own accounts. To prevent check fraud and other billing schemes, businesses rely on strong internal controls, such as requiring dual signatures on checks and conducting regular audits of accounts payable transactions.

Submitting false expense reports: Employees may inflate expenses or submit reimbursement requests for personal expenses, leading to financial loss for the company through expense reimbursement fraud. To mitigate this risk, establish clear expense policies and procedures, conduct regular audits of expense reports, and use expense management software to track and monitor spend.

Altering invoices: Fraudsters may alter invoices to artificially inflate amounts or redirect funds into illegitimate accounts. Be sure to verify invoices against purchase orders, conduct regular audits of invoices, and implement segregation of duties to ensure that multiple employees are involved in the invoice approval process.

Setting up fake vendors: Fraudsters may create fictitious vendors and submit false invoices for products or services that were never delivered. For better fraud detection and prevention, conduct due diligence on new vendors, verify vendor information before making payments, and implement vendor management processes to flag fraudulent invoices and monitor vendor activity.

Using cards for personal gain: Employees may use corporate cards for personal gain by making unauthorized purchases or cash withdrawals. Businesses can benefit from establishing clear card-usage policies, monitoring card transactions regularly, and conducting periodic reviews of card activity to prevent this type of fraud.

How to detect accounts payable fraud

Organizations can use tools like Benford's Law to identify anomalies that may indicate fraudulent activity. Monitoring financial transactions closely and conducting regular audits can uncover potential fraud schemes.

What is Benford’s Law?

Benford's Law is a mathematical principle that states that in many sets of numerical data, the leading digit is more likely to be small (1, 2, or 3) rather than large (7, 8, or 9). This law has been used as a tool to detect anomalies in financial data, including detecting AP fraud. By analyzing the distribution of leading digits in invoice amounts, organizations can identify potentially fraudulent transactions that do not conform to the expected pattern outlined by Benford's Law.

7 tips to prevent accounts payable fraud

While it's important to detect AP fraud, it's far better to prevent it. This list of actionable, common-sense measures can help improve accounts payable fraud prevention.

1. Implement strong internal controls

Address fraud prevention by implementing internal policies and procedures that make fraud a lot harder to achieve. These include proper segregation of duties, dual authorization for payments, and regular reconciliation of accounts.

2. Train employees on fraud awareness

Educate your employees on the common types of AP fraud and how to recognize red flags. Encourage them to report any suspicious activity immediately.

3. Stay up to date on fraud prevention techniques

Fraudsters are constantly evolving their tactics, so being proactive in learning about new fraud schemes can help you stay ahead. Companies that specialize in fraud awareness training can also provide resources for fraud prevention.

4. Verify changes in vendor information

Always verify any changes in vendor information, such as bank account details or contact information, through multiple channels. Never rely solely on email communication for such sensitive information.

5. Conduct regular audits

Regular audits of AP processes can help detect any irregularities or inconsistencies that could indicate fraud. Consider hiring a third-party auditor for an unbiased review in detecting accounts payable fraud.

6. Encourage a culture of transparency and accountability

Encourage open communication and reporting of any potential fraud risks, and ensure that employees understand the consequences of engaging in fraudulent activities.

7. Use automation and machine learning

Implement AP automation tools that use machine learning and AI to flag suspicious activities, such as duplicate invoices, duplicate payments, or vendor changes. These tools can streamline the AP process while providing an added layer of security.

Ready to safeguard your business with automation?

Implementing AP automation solutions can streamline invoice processing, reduce errors, and enhance fraud-prevention measures. BILL Accounts Payable offers advanced features to safeguard your finances and improve AP efficiency.

That's why Clif Family, makers of Clif bars, moved to BILL Accounts Payable—an email scam triggered the company to transition away from outdated manual processes.

Tired of playing detective? At Enlightened Equipment, the finance team often needed to hunt down purchases that weren't accounted for, sometimes requiring them to question their employees. The BILL platform gave them the visibility and documentation they needed.

Learn more about BILL Accounts Payable here.

Accounts payable fraud FAQs

Here are quick and easy answers to a few of the most common questions about AP fraud.

What are the red flags of accounts payable fraud?

There are several indicators of potential accounts payable fraud in a company. These include unusual vendor behavior like sudden changes in details without verification, receiving duplicate invoices, missing or altered documentation, and unexplained discrepancies in records. Promptly identifying and addressing these red flags can help prevent accounts payable fraud.

What to do if you find evidence of accounts payable fraud?

If you find evidence of fraud, take immediate action to mitigate damage and prevent further losses. Be sure to document any evidence, notify management, investigate the fraud, and enhance your internal controls to prevent future occurrences. Proactive measures can protect the company from financial losses and reputational damage.

How is accounts payable fraud calculated?

Calculating the financial impact includes the obvious losses from fraudulent payments as well as recovery costs and reputational damage. By understanding the risks and taking preventative measures, businesses can protect their assets and reputations.

Author
Emily Taylor
Contributing writer, BILL
With a background in finance and over a decade of experience in business writing, Emily simplifies complex finance topics to help businesses streamline operations, manage cash flow, and make smarter financial decisions.
Author
Emily Taylor
Contributing writer, BILL
With a background in finance and over a decade of experience in business writing, Emily simplifies complex finance topics to help businesses streamline operations, manage cash flow, and make smarter financial decisions.
Get more from BILL
Subscribe to finance insights and thought leadership content delivered straight to your inbox.
By continuing, you agree to BILL's Terms of Service and Privacy Notice.

Frequently asked questions

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Software Comparison

BILL Spend & Expense
Best for AI expense automation
4.5 on G2
  • Smart corporate cards with real-time tracking, flexible limits, and instant visibility into every transaction across your team [1]
  • Unlimited free virtual cards with unique numbers for each vendor or subscription—freeze, delete, or set custom limits instantly to prevent overcharges and reduce fraud risk [5]
  • AI-powered auto-categorization and receipt matching that connects card transactions and expenses into a single reconciliation workflow [1]
  • Customizable budgets with spend controls based on merchant, amount, receipt requirements, and configurable approval workflows [3]
  • Auto-freeze on cards with incomplete transactions, ensuring receipts and documentation are captured before additional spend is approved [1]
  • Up to 7x points on restaurants, 5x on hotels, 2x on recurring software, and 1.5x on all other purchases (rates shown are for weekly or daily billing cycle; rates vary by billing frequency) [2]
  • Two-way sync with QuickBooks, NetSuite, Sage Intacct, Xero, and Microsoft Dynamics; additional integrations with Acumatica, Slack, and HRIS platforms [1]

Pros

  • $0/user/month with all features included—no paid tier to unlock [4]
  • Merchant controls and auto-freeze cards at no extra cost [1]
  • Credit lines that don't fluctuate daily based on bank balance [4]
  • All ERP integrations (NetSuite, Sage Intacct, Xero) included free [1]

Cons

  • 12-month holding period before rewards can be redeemed [2]
  • Category reward multipliers cap at $5,000/month per category [2]
  • Less established in global, enterprise-scale expense programs with multi-country regulatory requirements

BILL Spend & Expense pairs corporate cards with AI-powered expense management and budget controls in a single platform at no cost—teams aren't paying per user or upgrading to unlock features that competitors gate behind paid tiers.

Merchant-level spend controls and auto-freeze on incomplete transactions give admins granular oversight without manual policing, and two-way ERP integrations are included free where Ramp and Brex charge for NetSuite and Sage Intacct access. The main trade-off is an initial 12-month rewards holding period before accumulated points can be redeemed. [1][2][3][4]

Commonly compared to: Ramp and Brex (for card-first expense management), and SAP Concur (for enterprise expense programs).

Pricing
$0/user/month with no annual fee
Integrations
Two-way sync with QuickBooks, NetSuite, Sage Intacct, Xero, and Microsoft
Ideal company size
SMB to mid-market
SAP Concur
Best for large enterprises
4 on G2
  • AI-powered receipt capture via ExpenseIt on the SAP Concur mobile app, with smart matching that combines credit card charges and e-receipts into expense reports automatically [7]
  • Configurable approval workflows with built-in audit rules that flag policy exceptions, plus optional Intelligent Audit and Verify add-ons for automated compliance checks [6][7]
  • Modular product suite: Concur Expense, Concur Travel, and Concur Invoice are separate products that can be purchased individually or together, so organizations can start with expense management and add capabilities over time [6]
  • Bank card feed integrations that import corporate card transactions directly into expense reports for automatic reconciliation [6]
  • Joule, SAP's AI assistant, for expense report review, spend analysis, and cost estimation [6]
  • Budget tracking and monitoring tools that give finance teams visibility into spend against departmental or project-level budgets [6]
  • Support for global operations with multi-currency expense reporting and country-specific tax and regulatory compliance tools [6]
  • Pro: 300+ pre-built integrations including native SAP ERP sync [7][8]
  • Pro: Global coverage with multi-currency and regulatory compliance tools [6]
  • Pro: Modular—add travel or invoice management without switching platforms [6]
  • Pro: AI-powered receipt capture and smart matching via ExpenseIt [7]
  • Con: Quote-based pricing; no published rates on the website [6]
  • Con: No corporate card offering; relies on bank card feed integrations [6]
  • Con: Implementation can be complex for smaller organizations [6]
  • Con: Live support requires purchasing the User Support Desk service [6]

SAP Concur is the incumbent in expense management software, with the largest partner ecosystem and broadest global footprint on this list. Its modular approach gives large organizations flexibility to start with expense management and layer on travel or invoice capabilities independently.

The trade-off is complexity—pricing is opaque, there's no corporate card offering, and smaller teams may find the platform more than they need. Organizations already in the SAP ecosystem will get the most value from native S/4HANA integration. [6][7][8]

Commonly compared to: BILL (for SMB expense management), and Coupa (for enterprise spend management).

Pricing
Quote-based
Integrations
QuickBooks, Xero, Sage,TSheets, Gusto, & most business credit cards.
Ideal Company Size
Mid-market to enterprise
Ramp
Best for a broad spend platform
4.8 on G2
  • Corporate cards with customizable spend controls by merchant, category, employee, or department, plus unlimited virtual and physical cards [9][10]
  • AI-powered receipt matching, transaction coding, and memo suggestions that auto-populate as soon as a card is swiped [9]
  • Policy agent that reviews every expense against company policy, auto-approves compliant transactions, and escalates only exceptions with full audit trail [9]
  • Expense submission via SMS, Slack, or Microsoft Teams in addition to web and mobile app [9]
  • Reimbursements for out-of-pocket expenses paid to employees' bank accounts in 1–2 business days [9]
  • Real-time spend reporting with custom dashboards, natural-language queries, and proactive overspend alerts [9]
  • Broader spend platform that includes AP automation, procurement, vendor management, and treasury alongside expense management [9]

Pros

  • Free plan includes corporate cards, expenses, and bill pay [11]
  • AI policy agent reviews 100% of expenses automatically [9]
  • Submit expenses via SMS, Slack, or Teams—no app required [9]
  • Broader spend platform covers AP, procurement, and vendor management [9]

Cons

  • Budget tracking requires Ramp Plus at $15/user/month [11]
  • NetSuite, Sage Intacct, and Dynamics integrations require a paid plan [11]
  • HRIS syncs and auto-lock cards require a paid plan [11]
  • Credit limits fluctuate daily based on connected bank balance [12]

Ramp's strength is breadth—it's not just an expense tool but a full spend management platform that includes AP automation, procurement, and vendor management alongside expenses. The AI policy agent is a differentiator, reviewing every transaction against company rules rather than relying on manual manager approvals.

The trade-off is that several features mid-market teams rely on—budget tracking, ERP integrations beyond QuickBooks and Xero, and HRIS syncs—require upgrading to Ramp Plus at $15/user/month plus a platform fee. [9][11]

Commonly compared to: Brex and BILL (for corporate cards and expense management), and SAP Concur (for enterprise expense programs).

Pricing
$0/user/month
Integrations
QuickBooks, NetSuite, Xero, Sage Intacct, Slack, & 100+ accounting tools.
Ideal Company Size
Startups to mid-market
Brex
Best for global teams
4.8 on G2
  • Corporate cards with customizable spend limits by role, department, or category, plus auto-approve for in-policy expenses and auto-decline for out-of-policy spend [13][14]
  • AI-powered expense reviews that auto-approve compliant transactions and surface only exceptions for human review, with clear visibility into why a transaction is flagged [13]
  • Auto-generated receipts and memos with OCR that matches receipts in any language or currency, plus automatic GL coding by department, project, and entity [13]
  • Live Budgets that let department heads set top-level budgets, provision spend to individuals or teams, and track usage in real time with anomaly detection [13]
  • Global reimbursements in 70+ countries in employees' local currency, with subsidiaries able to issue reimbursements from local bank accounts [13]
  • Expense submission and approval via Slack and WhatsApp, with in-app commenting on individual transactions [13]
  • Broader financial platform that includes bill pay, business banking with up to 3.68% yield, and treasury alongside expense management [14]

Pros

  • Free plan includes corporate cards, expenses, bill pay, and travel [15]
  • AI expense reviews with 99% average policy compliance rate [14]
  • Global reimbursements in 70+ countries in local currency [13]
  • Live Budgets with real-time tracking and anomaly detection [13]

Cons

  • Live Budgets require Premium at $12/user/month [15]
  • HRIS syncs and customizable ERP integrations require a paid plan [15]
  • Credit limits fluctuate daily based on connected bank balance [16]
  • Multiple expense policies and dynamic review chains require Premium [15]

Brex positions itself as a full financial stack for startups—cards, expenses, banking, and treasury in one platform. The AI expense reviews and 99% average compliance rate (per Brex's internal metrics) are notable, and the global reimbursement coverage across 70+ countries is broader than most competitors on this list.

Like Ramp, Brex gates budget management and HRIS integrations behind a paid tier, and credit limits fluctuate daily based on your bank balance. Teams that need predictable spending power or are past the startup stage may find the pricing structure adds up. [13][14][15]

Commonly compared to: Ramp and BILL (for corporate cards and expense management), and SAP Concur (for enterprise expense programs).

Pricing
$0/user/month
Integrations
NetSuite, QuickBooks, Workday,SAP Concur, Slack, & global banking portals.
Ideal Company Size
Startups to mid-market
Expensify
Best for simple reimbursements
4.5 on G2
  • SmartScan receipt capture by photo, email forwarding (receipts@expensify.com), or text message; auto-extracts transaction details and categorizes expenses [17]
  • Bring-your-own-card support: link existing corporate cards from 10,000+ banks globally for automatic reconciliation without switching card providers [17]
  • Expensify Visa Commercial Card with cash back on US purchases; cash back first offsets the Expensify subscription cost, then flows to the company's bank account [17]
  • Concierge AI for automated expense categorization, policy violation flagging, rule enforcement, and error reduction [17]
  • Global reimbursements for employees and independent contractors in their local currency [17]
  • Chat-based collaboration directly on individual expenses to resolve questions in real time rather than through email follow-ups [17]
  • 45+ integrations including QuickBooks, NetSuite, Sage Intacct, Xero, Workday, and Gusto [17]

Pros

  • Bring-your-own-card from 10,000+ banks globally [17]
  • Expensify Card cash back can offset the subscription cost [17]
  • SmartScan receipt capture by photo, email, or text message [17]
  • 45+ integrations including major ERPs and payroll systems [17]

Cons

  • No free plan; starts at $5/user/month [18]
  • Pricing structure varies by card spend volume [18]
  • Budget management, advanced approvals, and expense policies require Collect or Control plans [17]
  • No department-level budget management on par with card-first platforms

Expensify's strength is accessibility—it has the lowest barrier to entry for teams that just need to start tracking expenses and submitting receipts. The bring-your-own-card support from 10,000+ banks means companies don't have to switch card providers, and the SmartScan receipt capture (by photo, email, or text) is one of the more flexible input methods on this list.

The trade-off is that several features mid-market teams expect—budget management, advanced approvals, and expense policies—require upgrading to the Collect or Control plans, and spend controls are primarily limited to the Expensify Card rather than extending across all connected cards. [17][18]

Commonly compared to: Zoho Expense (for budget-friendly expense management), and BILL and Ramp (for integrated cards and expenses).

Pricing
From $5/user/month
Integrations
QuickBooks, Xero, Sage, TSheets, Gusto, & most business credit cards.
Ideal Company Size
Small to mid-market
Zoho Expense
Best for budget-conscious teams
4.5 on G2
  • Autoscan receipt capture with OCR that auto-categorizes and itemizes each expense, plus the ability to split or tag expenses across departments, projects, or cost centers [19][20]
  • Automated per diem calculations with pre-defined rules based on country, location, and trip details for regional compliance [20]
  • Corporate card management with real-time feeds that automatically match transactions to uploaded receipts for faster reconciliation [20]
  • Mileage tracking with four input methods across Android, iPhone, and Apple Watch [20]
  • Configurable approval workflows, expense policies, and audit rules with detailed audit trails for compliance [19][20]
  • Custom modules, workflow automation, webhooks, and configurable UI elements for businesses that need tailored expense processes [19]
  • Active-user pricing model: only employees who actually create expenses are charged, so admins and approvers who don't submit reports are free [21]

Pros

  • Free plan available for up to 3 users with core expense tracking [21]
  • Active-user pricing—admins and approvers aren't charged [21]
  • Automated per diem calculations by country and location [20]
  • Deep customization with custom modules and workflow automation [19]

Cons

  • Corporate card feeds and multi-level approvals require Standard plan [21]
  • Deepest value requires the broader Zoho ecosystem (Books, People, CRM) [19]
  • No corporate card offering; relies on connecting existing cards [20]
  • Travel booking, per diem, and live budgets require Premium plan [21]

Zoho Expense offers unusually deep customization at a low price point—custom modules, workflow automation, webhooks, and configurable UI elements that most competitors don't expose. The active-user pricing model is genuinely cost-effective for companies where only a portion of employees submit expenses regularly.

The trade-off is that there's no corporate card offering—you'll need to connect your existing cards—and the platform delivers its deepest value when used alongside other Zoho products like Zoho Books and Zoho People. [19][20][21]

Commonly compared to: Expensify (for budget-friendly expense management), and SAP Concur (for global compliance and customization).

Pricing
Free (3 users); from $4/user/month
Integrations
Zoho Books, QuickBooks, Xero, Sage, Microsoft Dynamics, & Google Workspace.
Ideal Company Size
Small to mid-market