Expense Reimbursement Fraud: Four Common Schemes

Expense reimbursement fraud is an employee claiming money back for costs that were personal, inflated, invented or already paid. The four schemes are mischaracterized, overstated, fictitious and duplicate expense claims. Each one leaves a different trace, so the tests differ: receipt review, vendor checks, duplicate matching and tying approved claims to the payments that actually left the bank.

Mischaracterized expense claims for personal costs

A mischaracterized expense is a real purchase, with a real receipt, that was personal rather than business. The receipt is genuine, which is what makes this scheme hard to catch. A family dinner becomes a client meal, a holiday hotel becomes a conference stay, and a home printer becomes office equipment.

The receipt alone rarely gives this away. The context does. Look at the date, the place and the pattern of claims around it:

• Weekend and holiday dates on meals and travel, when the person had no recorded business that day.
• Locations near the employee's home or a holiday destination, with no client or meeting nearby.
• Meals for a group claimed as a client meeting, with no attendee names or with names nobody can confirm.
• Items that suit personal use, such as electronics, gift cards, clothing or groceries, on a general expense line.

Ask for the business purpose on every claim and check it against something independent: a calendar entry, a client file, a sales visit report. A purpose written as "client meeting" with no client name is the weakest kind of support.

Corporate cards change the shape of this scheme without removing it. When an employee pays with a company card, the personal cost goes straight to the business and the claim becomes a coding entry rather than a reimbursement. The review questions are the same, but the money never passes through the employee's own account.

Overstated expense claims and altered receipts

An overstated expense is a real business cost claimed for more than it actually cost. The trip happened and the taxi was taken, but the claim shows a higher figure. This usually happens through an altered receipt, a handwritten receipt with no printed total, or a claim for the full fare when part of it was refunded.

The tests for overstatement compare the claim with an outside record of the true cost:

• Card statement lines for the same purchase, where the employee paid with a personal or company card. The amount on the statement is the real cost.
• Typical prices for the same item, such as mileage rates, standard hotel rates in that city or a regular taxi fare between two addresses.
• Edited digital receipts, where fonts, spacing or alignment differ around the total, or where the file's creation date is after the purchase.
• Rounded or handwritten totals, which are common on overstated claims because they are easier to change.

Mileage is a frequent target. A claim for 140 miles for a trip that a map puts at 60 is an overstatement even if the trip was real. Ask for start and end addresses on every mileage line and check a sample against a route.

Are fictitious expense receipts easy to spot?

Fictitious expense receipts are not always easy to spot, because templates and editing tools make convincing fakes simple to produce. They are easier to catch when the reviewer tests the vendor rather than the paper. A receipt from a business that cannot be found, has no phone number or shares the employee's address is a strong sign.

A fictitious expense is a cost that never happened. Some are entirely invented receipts. Others are real receipts taken from someone else, such as a stranger's restaurant bill or a colleague's discarded slip.

Tests on the vendor behind the receipt

• Look the vendor up. Confirm the business exists at the address on the receipt.
• Compare receipt numbers across claims from the same vendor. Sequential receipt numbers weeks apart suggest a pad of blanks rather than a busy shop.
• Match the vendor to the employee. An address, phone number or bank account shared with the employee points toward a vendor they control.
• Check the payment method. A receipt marked "cash" for a large amount has nothing to tie it to a statement.

When an employee sets up a vendor they control and bills the business through payables rather than through expense claims, the scheme becomes a fake-vendor problem. The red flags overlap with other forms of embezzlement, which the guide to signs of embezzlement in a small business brings together.

Duplicate expense reimbursement across claims and cards

Duplicate reimbursement is one cost paid back twice. It happens when the same receipt goes into two claims, when a cost is charged to a company card and then also claimed as a personal expense, or when an original receipt and its scanned copy are submitted months apart. Each payment looks valid on its own.

Duplicates are the scheme best suited to matching tests, because the evidence is the same data appearing twice. Match on:

• Vendor, amount and date across all claims from the same person.
• The same amount and vendor within a few weeks, which catches resubmission with a changed date.
• Expense claims against company card lines, for the same vendor and amount, to find costs paid both ways.
• Receipt image hashes or file names, where the expense tool keeps the original files.

An example claim test sheet

The sheet below is an example. The claims, amounts and outcomes are illustrative, not drawn from any real business.

Read across the results, not just down the amounts. One overstated taxi fare could be a mistake. A person with a query in four out of five sampled claims has a pattern, and the next step is a wider review of everything they have claimed.

A checklist of tests by scheme

• Mischaracterized: business purpose stated, attendee names, date against calendar, location against work.
• Overstated: claim against card statement, mileage against route, receipt edited or handwritten.
• Fictitious: vendor exists, receipt numbering, vendor details against employee details.
• Duplicate: vendor, amount and date matched across claims and against card lines.

Testing reimbursement payments in the bank statements

Reimbursement payments in the bank statements are the final check, because a claim can be approved correctly and still be paid wrongly. The test ties each approved claim to one payment out of the bank, to the right person, for the approved amount. Any payment without an approved claim, or paid twice, is an exception.

Work from both directions:

1. From claims to the bank. Take the approved claims for a period and find each payment on the statement. Confirm amount, date and payee.
2. From the bank to claims. Take every reimbursement payment on the statement, including transfers labelled as expenses, and find the claim that approved it.
3. Compare payees. Confirm that the bank account receiving each reimbursement belongs to the employee who made the claim.
4. List the leftovers. Payments with no claim and claims paid twice are the items to investigate.

Step 3 matters more than it seems. An employee who can change payee bank details in the expense system can send someone else's reimbursements to their own account. The same weakness is exploited from outside the business when an attacker sends a fake request to change bank details, which the post on business email compromise payment fraud explains.

Matching claims to payments is the same kind of work as matching invoices to bank lines. The post on automated invoice reconciliation covers how matching rules handle partial payments and many-to-one matches. When the statements arrive as PDFs, PreciseBankFlow can read every payment line, confirm each statement foots and flag payments with the same payee and amount on close dates, which is where double reimbursement shows up.

When is a bad expense claim an error rather than reimbursement fraud?

A bad expense claim is usually an error when it is isolated, small, easy to explain and corrected without argument once raised. People attach the wrong receipt, misread a policy or claim a cost already covered by a per diem. Fraud is more likely when the problems repeat, favor the claimant and resist simple explanation.

Honest causes worth ruling out first:

• Unclear policy, such as no written limit on meals or no rule on alcohol.
• Card and claim confusion, where a new employee does not realize a company card charge is already paid.
• Currency conversion, which can make a foreign receipt look overstated against a claim in home currency.
• Lost receipts replaced with a written note, which policies often allow up to a small amount.

When not to escalate

Do not treat one queried claim as an investigation. Ask the employee to explain or correct it, record the answer and move on. Escalate when the same person shows several kinds of problem, when explanations change or when the total over a year is material.

A weak policy also invites errors that look like fraud. A written expense policy with clear limits, required attendee names and a second approver for the approver's own claims removes most of the ambiguity. It also makes the real schemes stand out, because a person who breaks a clear rule repeatedly has much less room to call it a mistake.