What counts as employee expense fraud?

Employee expense fraud is any deliberate misuse of company funds through the expense-reimbursement or corporate-card process. The five most common forms in small businesses are duplicate billing, personal purchases disguised as business expenses, inflated or altered receipts, fictitious vendors, and mischaracterized expenses. The ACFE reports a median loss of $40,000 per expense-reimbursement fraud case.

How much do small businesses actually lose to expense fraud?

The ACFE's 2024 Report to the Nations puts occupational-fraud losses at a median of 5% of annual revenue, and small businesses (under 100 employees) lose a median of $150,000 per fraud case — more than large companies. Expense-reimbursement fraud specifically runs a median of 24 months before it's detected.

Why does monthly review miss most expense fraud?

Memory and volume. Thirty days after the fact, no one can remember whether a dinner was really with a client or whether a Sunday gas charge lines up with a delivery run. And reviewing 400+ line items at month-end is when pattern recognition breaks down. Nightly review catches the same transactions while receipts and calendar entries are still fresh.

What's the fastest way to catch duplicate billing?

Match every corporate-card charge against submitted reimbursement requests by employee, amount, and date (within a 7-day window). When the same amount from the same employee appears on both the card statement and in an expense report in the same week, it's a duplicate. Automated nightly audits surface duplicates the morning after the second submission lands.

Do I need dedicated software, or can a small business do this with a spreadsheet?

A spreadsheet works — sort transactions by employee and amount, flag round numbers, list every new merchant, cross-check card charges against reimbursement requests. The reason most small businesses eventually move to nightly automated audits isn't that the spreadsheet doesn't work; it's that the spreadsheet only works when someone actually opens it. A tool that runs at 3 AM every morning turns 'I'll review it Saturday' into 'I already saw it Tuesday.'

The Small Business Guide to Preventing Employee Expense Fraud

Small businesses under 100 employees lose a median of $150,000 per expense-fraud case, according to the ACFE — more than large enterprises. Expense-reimbursement fraud runs a median of 24 months before it's detected. This guide covers the five schemes that account for most of that loss, the specific patterns that give each one away, and why nightly monitoring catches them faster than monthly reviews.

The five schemes

Duplicate billing — the same expense claimed twice, usually once on a card and once as a reimbursement
Personal purchases disguised as business expenses
Inflated or altered receipts
Fictitious vendors and phantom expenses
Mischaracterized expenses — real charges mislabeled to fit a business category

Every scheme has the same weakness: it blends into normal spend and only reveals itself in pattern over time. Monthly review can't see patterns; nightly review is built for them.