Expense fraud: How to detect and prevent it in your organization
The right expense fraud prevention strategies can protect your business from costly employee misdeeds. Discover how to detect reimbursement fraud, tighten your processes, and safeguard your bottom line.
This article was originally published in May 2025 but has been refreshed and re-published with new content.
Expense fraud can be easy to miss because it often looks like a normal reimbursement request.
But when employees submit false, inflated, duplicate, or personal expenses as business costs, those seemingly small claims can quietly drain cash, create extra work for finance teams, and weaken trust in your controls.
Because the warning signs are often subtle, it can take time to spot a problem or to see who may be exploiting gaps in your process.
From inflated receipts to outright fictitious claims, there are many ways unscrupulous employees could skim a few dollars from your expense account.
Understanding the most common types of expense fraud and how to improve expense report fraud detection can help you to reduce cash leakage and strengthen your controls.
Key Takeaways
- Expense fraud can take many forms, including fake, inflated, duplicate, or mischaracterized claims, and small violations can add up over time.
- The most effective way to reduce risk is to combine clear policies, consistent oversight, and approval controls with tools that make suspicious activity easier to spot.
- Expense report software can strengthen prevention and detection efforts by automating reviews, improving visibility, and reducing manual work.
Here’s what we’ll cover:
What is expenses fraud?
Expense fraud happens when an employee intentionally submits false, inflated, duplicate, or personal expenses for reimbursement.
It is also known as reimbursement fraud, expense reimbursement fraud, or expense report fraud.
The Association of Certified Fraud Examiners (ACFE) defines an expense reimbursement scheme as a fraudulent claim for fictitious or inflated business expenses.
In other words, it’s when employees knowingly submit false spending claims or exaggerate the amount spent.
Expense fraud often involves relatively small sums, but if done repeatedly or spread across a large number of employees, the accumulated amount can have a big impact on your bottom line.
This type of fraud is more likely to happen if your employees can see vulnerabilities in your expense management procedures.
Any such loopholes are exposed when your system lacks oversight measures, such as appropriate and regular reviews of your company’s expense reports.
The ACFE has cited cases in which individuals exploited systemic flaws at major companies and multinationals, with the fraud going undetected for years.
In extreme cases, the cost can run to hundreds of millions of dollars.
What are the most common types of employee expense fraud?
The most common types of reimbursement fraud include submitting fictitious expenses, mischaracterizing expenses, inflating expenses, submitting the same expenses more than once, and colluding with vendors to commit fraud.
Employees may also take advantage of lax reimbursement rules to get away with submitting unsupported expenses.
Expense fraud usually shows up in a handful of repeatable patterns. Understanding those patterns makes it easier to spot reimbursement fraud before it becomes a costly habit.
| Type of expense | What it means | Example |
| Fictitious expenses | Employees submit a claim for something they never purchased. This may involve fake receipts created with software or blank receipts filled in manually. | An employee submits a receipt for a taxi ride that never happened. |
| Mischaracterized expenses | Employees submit a personal cost as if it were a legitimate business expense or mislabel an out-of-policy purchase. | An employee claims a dinner with friends as a client meeting. |
| Inflated expenses | A real business expense is altered, so the employee is reimbursed for more than they spent. | A handwritten receipt is changed from $10 to $100. |
| Duplicate submissions | The same receipt or transaction is submitted more than once, either deliberately or by exploiting weak review processes. | An employee submits the same hotel receipt in both a paper report and a digital expense claim. |
| Collusion with vendors | An employee works with a supplier or outside contact to submit false, inflated, or misleading charges for reimbursement. | A vendor issues an exaggerated invoice, and the employee receives part of the payment in return. |
| Abusing flexible rules | An employee takes advantage of exceptions in the expense process, such as claims approved without receipts or complete documentation. | An employee repeatedly submits unsupported expenses and relies on a convincing explanation to get reimbursed. |
How to detect expense fraud
Expense report fraud detection starts with looking for patterns that do not match normal business spending. Strong reviews combine policy checks, document checks, approval controls, and software alerts.
Regular audits
Conduct periodic reviews of expense reports to identify anomalies.
Start by checking that each expense is accompanied by a receipt, and cross-reference expense reports with travel schedules or meeting logs.
This confirms that there was good reason for the expense on the day in question.
Then verify the legitimacy of supporting documents by contacting vendors directly.
Common warning signs of expense report fraud are:
- Rounded figures that appear too neat or too frequent.
- Expenses that repeatedly fall just under approval thresholds.
- Vague descriptions such as “client meal” or “travel costs” with no supporting detail.
How does expense management software help with fraud detection?
Expense management software helps finance teams spot suspicious claims faster by automatically flagging duplicate submissions, policy violations, mismatched receipts, unusual timing, and other anomalies that are easy to miss in manual reviews.
Optical Character Recognition (OCR) tools can convert scanned or photographed receipts into searchable text, making it easier for the software to analyze expense data at scale.
When combined with machine learning and rule-based filters, the system can detect altered data, unusual claim frequencies, or vendor inconsistencies.
Advanced analytics can also reveal more subtle patterns, such as employees with consistently high claims or who repeatedly give preference to certain vendors.
Even if fraud isn’t confirmed, these insights can highlight areas that deserve a closer look.
How can you prevent expense reimbursement fraud?
The best way to reduce expense fraud is to make the rules clear, approvals consistent, and exceptions visible. Prevention works best when policy, process, and software reinforce each other.
Here are some proactive measures that can significantly reduce the risk of expense fraud:
Clear expense policies
Establish comprehensive guidelines outlining acceptable expenses and documentation requirements.
Be specific about receipt submission rules, spending limits and categories of reimbursable expenses.
Approval workflows
Implement a system of checks and balances for oversight, such as multi-level approval processes.
For example, you could require a manager’s approval for all expense reports.
For larger amounts, insist on a senior manager’s review. Ensure all approvals are documented and traceable.
Control of corporate cards
Build spending limits into the company credit cards you issue to employees.
Also, implement real-time monitoring capabilities that regularly review transactions for unusual activity.
Consider setting restrictions on certain types of purchases, such as entertainment or cash withdrawals.
And don’t forget to cancel the cards of departing employees.
Employee training
Educate staff on your expense policies and the potential consequences of fraud, such as disciplinary action, job loss, and even legal action.
Include training in ethical behavior as a part of your onboarding and employees’ ongoing professional development.
What to do if you detect expense fraud
If you detect employee expense fraud, respond consistently and professionally, by gathering evidence as part of an internal investigation, then confronting the employee and initiating the appropriate disciplinary action.
Having a clear process in place and reviewing it regularly helps protect your business, support fair treatment, and reduce legal risk.
1. Gather evidence
Collect all relevant documentation, including receipts, expense reports, and communication records.
Create copies of all evidence and keep them secure.
2. Conduct an internal investigation
Involve HR and legal teams to assess the situation in a professional manner.
The goal is to determine the extent of the fraud and who is responsible.
3. Confront the employee
Approach the individual professionally and present the evidence.
Allow them to explain whether there is a non-malicious reason for the anomalies.
4. Take disciplinary action
If you’re satisfied that the anomalies were intentional, refer to company policy to decide on the appropriate disciplinary measures.
These should reflect the severity of the fraud, indicating whether it warrants a formal warning, suspension, or termination of employment.
Your response should follow legal guidelines.
5. Review and strengthen policies
Analyze how the fraud occurred so you can update policies and controls to prevent future incidents.
For example, you might implement stricter approval limits or require more detailed documentation for certain expense types.
Final thoughts
Expense fraud often starts small, but its financial and cultural impact can quickly grow if left unchecked.
From mischaracterized expenses to duplicate submissions and more deliberate schemes, even routine reimbursements can become a source of unnecessary risk.
The good news is that you can reduce that risk with the right mix of clear policies, consistent oversight, employee training, and stronger approval controls.
When you pair those measures with modern expense management technology, it becomes much easier to spot issues early, enforce your rules fairly, and protect your bottom line as your business grows.
Just as importantly, stronger expense controls help build a culture of transparency and accountability across your organization.
That means less manual effort for finance teams, fewer gray areas for employees, and more confidence that your processes can scale.
Explore expense report software to see how automation can help you streamline reviews, strengthen controls, reduce fraud risk, and improve visibility into employee spending.
Expense fraud FAQs
The key difference between fraud and a mistake is intent. Expense fraud involves knowingly submitting false or misleading claims for personal gain, while an honest mistake is an unintentional error, such as choosing the wrong category, entering the wrong amount, or misunderstanding the policy.
Some of the most common warning signs of expense fraud include rounded amounts, duplicate claims, vague or incomplete descriptions, altered receipts, and repeated submissions that fall below approval limits. Expenses that do not match supporting documents, travel records, or business activity can also signal that a claim deserves closer review.
A simple example of expense fraud is submitting a personal dinner receipt and labeling it as a client meeting. Other examples include duplicate submissions, inflated totals, fake receipts, and claiming out-of-policy purchases as business expenses.
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