How to Protect Your Business from Financial Fraud

Financial fraud costs UK businesses billions of pounds every year, and small businesses and sole traders are disproportionately targeted. Fraudsters know that smaller operations often lack the sophisticated security systems and dedicated compliance teams that larger companies have. One successful scam can devastate a sole trader's finances, and in the worst cases, put them out of business entirely.

I am Penny, your AI bookkeeper at Accounted, and part of my job is helping you keep your money safe. In this guide, I will walk you through the most common types of fraud targeting small businesses, how to spot them, and the practical steps you can take to protect yourself.

The Most Common Types of Fraud Targeting Small Businesses

Understanding the threats you face is the first step to protecting yourself. Here are the frauds I see most frequently:

Invoice Fraud

Invoice fraud is one of the most damaging scams because it exploits the normal process of paying bills. There are several variations:

Fake invoices: Fraudsters send invoices for goods or services you never ordered. They rely on busy business owners paying invoices without checking them carefully. The amounts are often small enough to avoid scrutiny — £50-£200 for "directory listings," "domain renewals," or "advertising services" you never signed up for.

Supplier impersonation: A fraudster poses as one of your genuine suppliers and sends an email asking you to update their bank details. The next time you pay a real invoice, the money goes to the fraudster's account instead. This is extremely common and can involve significant sums.

Mandate fraud: Similar to supplier impersonation, but targeting your regular payments. A fraudster contacts you claiming to be your landlord, utility provider, or HMRC, and asks you to change the account you pay into.

Phishing and Social Engineering

Phishing attacks use fake emails, texts, or phone calls to trick you into revealing sensitive information — passwords, bank details, personal data — or into clicking links that install malware on your devices.

HMRC impersonation is particularly prevalent. Fraudsters send emails or texts claiming you are owed a tax refund, or threatening penalties unless you click a link and provide your details immediately. HMRC has published guidance on recognising phishing emails that every business owner should read. For a detailed guide on spotting these scams, see my article on how to spot HMRC scam emails.

Payment Diversion Fraud

This involves intercepting a genuine payment and diverting it to a fraudulent account. Fraudsters might hack your email account and alter the bank details on invoices you send to clients, or they might intercept communications between you and a client to redirect payments.

Identity Theft

Fraudsters can use stolen business or personal information to open credit accounts, take out loans, or make purchases in your name. They might use your business name and address to set up fraudulent operations, leaving you to deal with the fallout.

How to Protect Your Business

Protection requires a combination of good habits, proper systems, and ongoing vigilance. Here are the key measures every small business should implement.

Verify Everything

Check invoices before paying: Never pay an invoice without verifying that you actually ordered the goods or services. Cross-reference invoices against purchase orders or agreements. If you do not recognise an invoice, do not pay it — contact the supplier directly using contact details you already have on file (not the ones on the suspicious invoice).

Verify bank detail changes: If a supplier asks you to change their payment details, always verify the request by calling them on a known phone number. Do not use the number in the email requesting the change — it might connect you to the fraudster. This single habit prevents the majority of invoice fraud.

Be sceptical of urgency: Fraudsters create urgency to prevent you from thinking clearly. "Your account will be closed," "Payment must be made today," "You will face legal action" — these pressure tactics are red flags. Legitimate organisations give you reasonable time to respond.

Secure Your Systems

Use strong, unique passwords: Every business account should have a unique password. Use a password manager to generate and store complex passwords. Never reuse passwords across multiple services.

Enable two-factor authentication (2FA): Turn on 2FA for every account that supports it — banking, email, accounting software, social media, cloud storage. This means that even if a fraudster obtains your password, they cannot access your account without the second factor.

Keep software updated: Software updates often include security patches for newly discovered vulnerabilities. Enable automatic updates on your devices, or check for updates weekly.

Use secure email: Consider using encrypted email for sensitive communications. At minimum, be cautious about what information you send by email — bank details, personal data, and financial documents should be sent securely.

Secure your Wi-Fi: If you work from home or a business premises, make sure your Wi-Fi network is password-protected and uses WPA3 (or at least WPA2) encryption. Avoid conducting business transactions on public Wi-Fi networks.

Protect Your Financial Data

Monitor your bank accounts daily: Check your business bank account every day for transactions you do not recognise. The sooner you spot unauthorised activity, the more likely you are to recover the funds. Most banking apps offer real-time notifications for transactions — enable them.

Reconcile regularly: Regular bank reconciliation — matching your accounting records to your bank statements — helps you spot discrepancies quickly. With Accounted, I reconcile transactions automatically and flag anything unusual.

Limit access to financial information: Only share bank details, login credentials, and financial data with people who genuinely need them. If you work with subcontractors or virtual assistants, give them the minimum access necessary.

Shred physical documents: Invoices, bank statements, tax documents, and any paperwork containing financial information should be shredded before disposal. Identity fraudsters can piece together enough information from discarded documents to cause serious harm.

Know the HMRC-Specific Risks

HMRC is one of the most impersonated organisations in the UK. Here are the key things to know:

• HMRC will never email you asking you to click a link to claim a refund
• HMRC will never send text messages asking for personal or financial information
• HMRC will never threaten immediate arrest or legal action by phone
• If in doubt, log into your HMRC online account directly (not via any link) to check for genuine communications
• Report suspected HMRC scams to phishing@hmrc.gov.uk

For a comprehensive guide to recognising and reporting HMRC scams, read my article on invoice fraud protection.

What to Do If You Are a Victim of Fraud

Despite your best precautions, fraud can still happen. If it does, act quickly:

1. Contact your bank immediately: Report the fraudulent transaction and ask them to attempt a recall. The faster you act, the better the chance of recovering your money. Most banks operate a 24-hour fraud hotline.

2. Report to Action Fraud: This is the UK's national reporting centre for fraud and cybercrime. Report online at actionfraud.police.uk or call 0300 123 2040. While recovery rates are low, reporting helps law enforcement identify patterns and pursue organised fraudsters.

3. Change your passwords: If any of your accounts may have been compromised, change the passwords immediately and enable 2FA if you have not already.

4. Inform your clients and suppliers: If your email has been hacked, let your contacts know so they can be vigilant about any suspicious communications appearing to come from you.

5. Check your credit report: If personal data has been stolen, monitor your credit report for any fraudulent applications for credit in your name. You can check for free through Experian, Equifax, or TransUnion.

6. Review your insurance: If you have cyber insurance or business insurance that covers fraud, contact your insurer to make a claim. Read more about what insurance cover you should have in my guide on business insurance for sole traders.

Building a Culture of Security

Fraud prevention is not a one-time exercise — it is an ongoing practice. Build these habits into your daily routine:

• Check your bank account every morning
• Verify any payment requests that seem unusual
• Keep your software and devices updated
• Back up your data regularly
• Review your security practices quarterly
• Stay informed about new scam techniques

If you employ staff or work with subcontractors, make sure they understand the risks too. A single employee clicking on a phishing link or paying a fraudulent invoice can compromise your entire business.

Let Me Help You Stay Safe

At Accounted, security is built into everything we do. I help you reconcile transactions automatically, flag unusual activity, and maintain clean financial records that make it easier to spot when something is wrong.

Sign up for Accounted and let me help you build a financial management system that keeps your money safe while reducing the admin burden of running your business. Because the best time to prevent fraud is before it happens.

Visit our pricing page to find the right plan for your business, and take the first step towards better financial security today.

Useful Resources

• HMRC Self Assessment guidance
• HMRC's guidance on self-employed expenses

Accounted makes bookkeeping simple — Penny categorises your transactions automatically so you don't have to. See how →