Expense Reimbursement Fraud: Catching Inflated & Fake Claims

Every fraud case I've worked has a moment where the numbers looked fine and the story didn't. Expense reimbursement fraud is one of the clearest examples of that gap. It rarely announces itself with a missing receipt or an obviously fake vendor. More often, the paperwork checks out completely — the invoice is real, the purchase happened, the amount matches — and the fraud is buried underneath, in the reason the expense exists at all. As a forensic accountant, I've learned that expense reimbursement fraud is less about catching bad math and more about catching bad motive, and that distinction changes how a company has to look at its own expense reports.

How Expense Reimbursement Fraud Hides in Plain Sight

One case has stuck with me because it never should have grown as large as it did. An employee started using his personal credit card to cover very large manufacturing purchases on behalf of his employer, then submitting those charges for reimbursement. On paper, everything was legitimate. The purchases were real, the invoices matched, the reimbursements lined up dollar for dollar with actual company spend. Nothing was coded as fraud, no fake vendors were involved, no receipts were fabricated. The problem wasn't the transaction — it was the motive behind it.

He was routing tens of thousands of dollars of company spend through his own card purely to rack up personal credit card reward points. Because the underlying expenses were genuine, the scheme never tripped the usual alarms. No one asked the one question that would have unraveled it immediately: why is a frontline employee personally floating major manufacturing costs in the first place? Once he realized no one was asking, the purchases got bigger and more frequent. Eventually the company was, in effect, subsidizing his personal travel and perks through its own supply chain, one reimbursement at a time.

Expense fraud doesn't always look like theft. Sometimes it looks like convenience, or "just getting points" — until someone finally asks why the process exists at all.

I should note that in this case, I was on the receiving side of those payments, not the one investigating the scheme, so I never had visibility into how it was ultimately resolved or what the final total came to. Not every case like this gets a tidy ending you get to see — but the mechanics of how it grew are exactly what makes it worth studying.

The Most Common Face of Expense Reimbursement Fraud

That manufacturing case is memorable because of how unusual the motive was, but the version of expense reimbursement fraud I see most often is much more ordinary. In small businesses, it frequently starts with the owner. When an owner routinely runs personal travel, meals, or entertainment through the company, it sets a quiet precedent — nobody has to say it out loud, but employees take their cues from what leadership does, not what the policy manual says. Once that line between personal and business spending blurs at the top, enforcing clean practices anywhere else in the company becomes nearly impossible.

In larger organizations, the same impulse shows up dressed differently: a personal meal gets logged as a client meeting, a family trip becomes a "conference," a household subscription gets slipped into the software budget where nobody looks closely. Across companies of every size, travel and entertainment is by far the most abused category. It's flexible, it's subjective, and it's easy to rationalize — which makes it the perfect place for personal spending to hide inside otherwise legitimate business activity.

Where Expense Review Processes Fall Short

When I look at how most companies review expenses, the mistake is almost always the same: they audit totals instead of behavior. A typical approval workflow checks whether the amount looks reasonable, whether a receipt is attached, and whether the category matches the chart of accounts. None of that actually tells you whether the expense was legitimate to begin with.

What gets missed is the nature of the spending. Why is an employee submitting three "client lunches" a week? Why doesn't a manager's travel schedule line up with what their job actually requires? Why does a subscription line keep creeping upward in a category that should be flat and predictable? A review process built around volume and formatting lets personal charges slide through because they look completely normal on paper. The real failure is auditing numbers instead of patterns — and patterns are exactly where every expense reimbursement scheme lives. This is the same blind spot that shows up across other kinds of fraud, and it's worth reviewing the most common red flags of financial fraud to see how often it repeats.

A Practical Fix That Actually Works

Fixing this doesn't require an overhaul of the accounting system. It requires changing what gets asked during review. Based on the schemes I've investigated, here's what closes the gap:

1. Require a genuine second set of eyes on travel and entertainment spend — not a rubber-stamp approval, but someone who actually looks at the nature of the expense, not just the total.
2. Review expenses by employee, not by transaction. Looking at a month or a quarter of one person's spending at a time is what makes a pattern visible; reviewing transactions one at a time hides it.
3. Compare spending to job duties. If a role doesn't call for travel, conferences, or client entertainment, those categories should be close to nonexistent for that employee — and if they're not, that's a flag on its own.
4. Require that business expenses be business-initiated. Anything the company didn't specifically ask for should come with a justification attached before it's reimbursed.
5. Hold owners to the same standard as everyone else. Tone at the top drives behavior throughout the organization, so the rules can't bend for leadership without bending for everyone.

What makes this approach work is the shift in the underlying question. Instead of asking "does the receipt exist," the review starts asking "does this make sense for this person, in this role, right now." Once expenses are reviewed in context instead of isolation, schemes stop hiding — and honest employees feel protected by a fair process instead of policed by a suspicious one. Building that kind of review into daily operations is really a question of internal controls done well, not just a finance team habit.

When to Bring in a Forensic Accountant

Most companies don't discover expense reimbursement fraud through a dramatic tip — they discover it because a pattern finally looks strange enough that someone digs in. By the time that happens, the scheme has often been running for months or years, and untangling exactly what was legitimate spend versus what was personal abuse requires more than a spreadsheet review. That's where formal fraud investigations come in — tracing every reimbursement back to its underlying purpose, establishing a timeline of how the behavior escalated, and building documentation that holds up if the matter goes further than an internal conversation.

The companies that catch this early aren't the ones with the strictest expense policies on paper — they're the ones willing to ask uncomfortable questions about spending patterns before those patterns become habits. If something about your company's expense reports doesn't quite add up, or you simply want a second, trained set of eyes on your review process before a small scheme becomes a large one, contact us. I'd rather help you catch this at the "why does this exist" stage than the "how big did this get" stage.