Expense Claims Are the Most Common Source of Employee Fraud in UK SMEs

More than one in five UK workers admit they have fiddled their expenses. That figure comes from a Travelodge-commissioned survey of British employees, and while it has been cited for years, nothing in the fraud landscape suggests the number has gone down. If anything, it has become easier.

Employee expense fraud UK small business owners face is not a niche problem. According to the Association of Certified Fraud Examiners (ACFE), organisations lose around 5% of annual revenue to fraud, and expense reimbursement abuse is consistently among the most reported categories. For a small business turning over £500,000, that could mean £25,000 quietly leaving through the back door.

The hard part is that expense fraud rarely announces itself. It hides in the detail: a receipt that looks real, a mileage claim that is a little high, a duplicate submission that slips through because you approved one batch on a Tuesday and another on a Friday. By the time most SME owners notice, it has been going on for months.

Why Expense Claims Are So Vulnerable to Fraud

Expense claims sit in a blind spot in most small businesses. They come in too frequently and in too many formats for a busy owner or bookkeeper to scrutinise carefully. They feel low-stakes compared to payroll or supplier invoices. And there is often a social dynamic at play: challenging a team member's expense claim feels accusatory, so borderline submissions get waved through.

The result is a system that fraudsters, whether habitual or opportunistic, learn to exploit quickly.

The trust gap in SMEs

Small businesses tend to run on trust. That is one of their strengths. But in an expense context, trust without any verification mechanism is an open door. Staff who would never consider taking money from the till will sometimes convince themselves that rounding up a mileage claim or submitting a personal meal is a minor perk rather than fraud.

That thinking is widespread. Research carried out among finance workers in the US and UK found that 30% had noticed an increase in expense fraud following the widespread availability of AI image tools. The social permission to fudge a receipt has not gone away; the tools to do it convincingly have just got cheaper and easier to use.

The scale of the problem

Expense fraud is not a problem reserved for large corporates. ACFE data shows that small businesses (under 100 employees) actually suffer a higher median loss per fraud incident than larger organisations, precisely because they have fewer controls in place. The median loss across all occupational fraud cases is $145,000. In smaller organisations, losses can consume a meaningful share of annual profit.

In one reported example, expense management platform Ramp flagged over $1 million in potentially fraudulent expense submissions within 90 days of deploying AI-based detection across its customer base. That figure covers a range of businesses, but it illustrates the scale of what automated systems catch that manual review routinely misses.

The Most Common Expense Fraud Schemes in UK SMEs

Not all expense fraud looks the same. The most common schemes in UK small businesses fall into a few predictable patterns, and knowing what to look for is the first step to catching it.

Inflated receipts

This is the most common form. An employee spends £18 on a client lunch, alters the receipt to show £38, and submits it. With printed receipts, this might involve a basic edit. With AI tools, a convincing fake receipt can now be generated in minutes, complete with the correct logo, VAT number format, and itemised layout of a real restaurant.

The red flags are subtle: VAT numbers that do not match the registered details for the supplier, totals that do not add up across line items, or the same supplier appearing repeatedly with slightly different formatting each time.

Duplicate claims

An employee submits the same receipt twice, sometimes weeks apart in different expense batches, banking on the fact that no one is cross-referencing across reporting periods. This is one of the oldest tricks in the book, and it still works in businesses that process expenses manually or in silos.

Duplicate detection is straightforward when automated: match on supplier name, amount, date, and VAT number. Doing it manually across dozens of submissions per month is where the cracks appear.

Personal expenses submitted as business

Grocery shopping submitted as a team lunch. A personal Amazon order listed as office supplies. A family weekend trip with the hotel receipt put through as a client visit. These claims are harder to spot because the receipts are genuine. The fraud is in the categorisation, not the document itself.

This scheme relies on the reviewer not knowing what the employee was actually doing on that date, or on the submission volume being high enough that individual items do not get scrutinised.

Mileage padding

Mileage fraud is the one category that UK workers have historically been most casual about. Rounding up a 14-mile trip to 20 miles feels trivial. Done monthly across a team, it adds up fast. Automated mileage verification, which cross-references claimed distances against mapping data and postcode records, catches padding that would be invisible in a manual review.

Receiptflow's **automated receipt** verification flags duplicates, statistical anomalies, and inconsistencies before they become compliance issues. If your business is still processing expense claims manually, it is worth seeing what automated checks look like in practice. Try Receiptflow free.

How to Prevent Employee Expense Fraud in Your Small Business

Prevention does not require an aggressive audit culture or expensive compliance consultants. Most of the practical measures are straightforward to put in place and send a clear signal to staff that submissions are being checked.

Set a clear expenses policy

A written policy is the foundation. It should define what is and is not an allowable expense, set per-category limits, require original receipts for any claim above a set threshold (say, £10), and specify the submission window. Many small businesses operate without a formal policy, which means employees have no clear boundary to stay within and no reason to believe their claims will be scrutinised.

Separate submission and approval

Wherever possible, the person submitting expenses should not be the person approving them. This sounds obvious, but in small teams it is common for a line manager to approve their own expense claims or for submissions to go directly to an owner who is too busy to look carefully. A basic two-step process, submit to bookkeeper, approve by director, removes the easiest loophole.

Use automated receipt verification

Manual review has a ceiling. You can check every tenth claim carefully or every claim quickly. Neither approach catches organised abuse reliably. Automated systems check every submission against a consistent set of rules: duplicate detection across the full submission history, VAT number validation, statistical anomaly flagging for amounts that sit outside normal ranges for that supplier or category, and pattern detection for repeat offenders.

This is not about distrusting your team. It is about removing the ambiguity that lets borderline behaviour continue unchallenged. When staff know that claims go through an automated check, the casual fudging tends to stop on its own.

Review expense patterns, not just individual claims

A single inflated receipt might pass a casual review. A pattern of inflated receipts from the same employee, in the same category, always just below the receipt-required threshold, is far harder to explain. Reviewing at the pattern level, rather than claim by claim, catches the schemes that are designed to stay under the radar.

What to Do If You Suspect Expense Fraud

If you identify a suspicious pattern, do not confront the employee immediately. Document what you have found: dates, amounts, specific receipts, and any cross-referencing you have done. Where possible, pull together a clear timeline.

For amounts above a few hundred pounds, it is worth taking brief advice from an employment solicitor before acting, both to protect your legal position and to make sure any disciplinary process follows a fair procedure. ACAS guidance on gross misconduct and summary dismissal applies here.

For smaller amounts, a private conversation, supported by the documented evidence, is usually sufficient. The goal is not always prosecution. Often it is stopping the behaviour, recovering what you can, and tightening your controls so it cannot happen again.

Automated Detection Is Now Within Reach of Small Businesses

For most of the history of expense fraud, automated detection was the preserve of large enterprises with dedicated finance teams and expensive software. That has changed. Receipt scanning and verification tools designed for small businesses now include the same core detection logic: duplicate matching, anomaly scoring, VAT validation, and pattern analysis.

The practical impact is significant. A small business processing 200 expense claims a month cannot manually cross-reference every submission against every previous one. An automated system does it in seconds, every time, without the social awkwardness of having to challenge a colleague face to face.

Expense fraud is often described as a low-priority risk for small businesses, something to worry about once you have scaled. The ACFE data suggests the opposite: it is precisely at the small business stage, when controls are informal and trust is high, that fraud takes hold most easily and does the most damage relative to the size of the organisation.

Knowing what to look for on the receipt itself is a useful first line of defence before automated checks even come into play.

Receiptflow's automated receipt verification flags duplicates, statistical anomalies, and inconsistencies before they become compliance issues. See how it works.