Once you cross 50 employees, your expense process (which worked fine with 20 people) will inevitably begin to creak. Submissions pile up, approvals get delayed, and you’re starting to suspect not every receipt is legitimate.
Between 50 and 250 headcount, you hit a dangerous inflection point. You’re too big to manually check everything, too small to have dedicated fraud resources or a full compliance team. What was annoying at 50 employees becomes genuinely risky at 150.
UK businesses collectively process around £51 billion in employee expenses annually – roughly £7,437 per employee. As you scale, that figure compounds. And with it, so do the risks. In 2026, those risks carry heavier consequences than ever before, from criminal liability under new fraud legislation to stricter HMRC penalties and operational disruption.
Let’s look at the six critical risks that intensify as you grow, and why addressing them now is more important than ever.
1. Processing costs spiral out of control
Manual expense processing costs an average of £46 per claim. At 50 employees submitting monthly expenses, that’s roughly £27,600 annually just in processing time. Scale to 200 employees, and you’re looking at over £110,000.
About 19% of all expense reports contain errors. Correcting a single erroneous claim costs an additional £41 and takes 18 minutes on average. When you’re processing thousands of claims, these costs accumulate to hundreds of thousands in lost productivity each year.
It’s a time sink for your business, all the way round. Your finance team will waste time chasing receipts and fixing spreadsheets. While employees across the business lose hours to expense submission instead of doing their actual jobs.
This administrative drag compounds as headcount grows, levying a productivity tax on your entire organisation.
2. Fraud becomes statistically inevitable
Research by the Association of Certified Fraud Examiners indicates that most businesses lose up to 5% of annual revenue to fraud, with expense reimbursement schemes being a primary contributor. The average expense fraud scheme goes undetected for 18 months and results in a median loss of £40,000.
In that 50-250 employee range, you no longer have the visibility you had at 30 people. But you likely don’t have sophisticated fraud detection tools yet. According to our own research, nearly half (47%) of employees admitted to having exaggerated or falsified their mileage claims.
At scale, you can’t personally review every claim. Managers are approving expenses from their teams without detailed scrutiny. The opportunity for inflation, duplication, and outright fabrication grows exponentially. And because most fraud goes undetected for over a year, the financial damage accumulates silently.
3. Criminal liability under new fraud legislation
Since 1 September 2025, UK companies face a new corporate criminal offence: failure to prevent fraud under the Economic Crime and Corporate Transparency Act 2023.
If you meet at least two of these criteria – over 250 employees, over £36 million turnover, or over £18 million in assets – you’re subject to strict liability. This means if an employee commits fraud that benefits your organisation (like deliberately inflating expenses to reduce taxable profit), your company can be prosecuted. Full stop.
The only defence is proving you had ‘reasonable procedures’ in place to prevent it. And crucially, the burden of proof sits with you. If fraud occurs, you’ll need to demonstrate that your anti-fraud procedures were both reasonable and effectively implemented.
The sanctions are severe: unlimited fines. Severe reputational damage. Potential exclusion from public procurement opportunities.
If you’re in the 100-250 employee range and you’re approaching these thresholds, the clock is ticking. Your existing expense policy and financial controls must be robust and genuinely operational.
4. HMRC penalties hit harder
HMRC has significantly strengthened its penalty regime for 2026. If poor expense management leads to tax underpayments, you can face penalties between 30% and 100% of the tax due, depending on whether HMRC deems the error a ‘lack of reasonable care’ or ‘deliberate and concealed’.
Improper record-keeping or missing receipts can result in HMRC denying VAT reclaims, directly affecting your cash flow. When you’re manually processing hundreds of expense claims monthly, the margin for error widens.
A few missing receipts here, some misclassified expenses there. It adds up. And HMRC is less forgiving than it used to be.
For growing companies, tax compliance isn’t just about getting your corporate tax return right. It’s about having the systems and controls to prove every expense claim is legitimate, properly categorised, and supported by documentation. At 150 employees, that’s difficult without automation.
5. Audit failures and financial reporting risks
With the major update to FRS 102 taking effect for periods starting on or after 1 January 2026, auditors are increasingly likely to flag manual or error-prone expense systems as a material weakness in internal controls.
Under-reported or misclassified expenses can distort key performance indicators like EBITDA, potentially triggering breaches of bank loan covenants.
This is particularly relevant given the new lease accounting rules under FRS 102, which replace operating lease expenses with depreciation and interest charges (fundamentally changing how EBITDA is calculated).
While these updates primarily focus on revenue recognition and lease accounting, they increase the importance of robust expense controls and accurate financial reporting across all areas.
If your expense data isn’t reliable, your financial statements aren’t reliable. And if your auditors don’t trust your controls, you’re looking at qualified opinions, increased audit fees, and difficult conversations with your board and investors.
6. People problems compound
Expenses are uniquely personal in accounting. They involve employees fronting their own money for business purposes, creating tangible financial pressure that affects morale, productivity, and retention.
When expense processing is slow and manual, reimbursements get delayed. For employees – especially lower-paid staff or frequent travellers – this creates financial stress. They’re essentially providing interest-free loans to the company (while waiting weeks for repayment).
This isn’t just an inconvenience. Delayed reimbursements can lead to increased staff turnover. In a tight labour market, losing good people over something as fixable as slow expense processing is inexcusable.
Operationally, there’ll be impacts too. Employees may stop spending money on legitimate business expenses if they face significant delays in being repaid. Client meetings get cancelled. Marketing initiatives stall. Business development grinds to a halt because people are reluctant to put things on their personal cards.
The operational cost of poor expense processes extends far beyond the finance team.
The solution: get ahead of the curve
The common thread through all six risks is this: manual, spreadsheet-based expense management doesn’t scale. What works at 30 employees breaks at 100. What breaks at 100 becomes dangerous at 200.
You don’t need to build these systems from scratch. Webexpenses helps you handle your entire expense process – mileage tracking, Expense Cards, and credit card reconciliation – all in one platform. We work with the systems you’ve got, not against them. Our platform integrates with all the main finance and accounting systems (or we can do a .csv file transfer if needed). Our customisation is flexible enough to grow as you do.
If you’re between 50 and 250 employees and recognising these risks in your own organisation, now is the time to act. The regulatory landscape is tightening, the financial costs are compounding, and the operational risks are real.
Book a demo to see how Webexpenses can help you build the ‘reasonable procedures’ you need to protect your business, reduce fraud, and free your team from expense admin.
