How to Protect Your Business From Online Fraud

Online fraud isn't just a problem for big corporations. If you're a sole trader or small business owner, you're actually more likely to be targeted — precisely because fraudsters know you probably don't have a dedicated IT security team or a compliance department watching your back. You're running everything yourself, you're busy, and you're more likely to click a dodgy link at the end of a long day when your guard is down.

The numbers are sobering. UK businesses lose billions of pounds to fraud every year, and a significant chunk of that falls on smaller operators. The good news is that most online fraud relies on relatively simple tricks, and protecting yourself doesn't require a degree in cybersecurity. It requires awareness, a few good habits, and the right tools.

Understanding the Main Threats

Before you can protect yourself, it helps to know what you're protecting against. Here are the most common types of online fraud that affect sole traders and small businesses:

Phishing emails. These are fake emails designed to look like they come from a trusted source — your bank, HMRC, a payment provider, or even a client. They typically ask you to click a link and enter sensitive information, or they contain an attachment that installs malware on your device. Phishing is by far the most common type of online fraud, and it's getting increasingly sophisticated.

Invoice fraud. A fraudster intercepts or mimics a genuine invoice, changing the bank details to their own account. If you pay the invoice without verifying the details, the money goes straight to the criminal. This is particularly dangerous for businesses that regularly receive invoices by email.

CEO fraud / impersonation. The fraudster pretends to be someone you trust — a client, supplier, or even your accountant — and asks you to make an urgent payment or share sensitive information. The urgency is always the giveaway.

Payment card fraud. If you take card payments, you're potentially vulnerable to fraudulent transactions made with stolen card details. Chargebacks from these transactions come out of your pocket.

Account takeover. A fraudster gains access to one of your business accounts — email, banking, social media, accounting software — and uses it to steal money or information. This usually happens through weak passwords, reused credentials, or successful phishing attacks.

Malware and ransomware. Malicious software installed on your device can steal data, log keystrokes, or lock you out of your files until you pay a ransom. It often arrives through email attachments or compromised websites.

For a deeper dive into phishing specifically, have a look at our guide on how to spot a phishing email and protect your business.

Securing Your Email

Your email account is the gateway to almost everything else. If a fraudster gets into your email, they can reset passwords for your bank accounts, your accounting software, your payment processors — the lot. Securing your email is not optional; it's the foundation of your entire digital security.

Start with a strong, unique password. Don't reuse a password from any other account. Use a passphrase — something long and memorable — rather than a short, complex string of characters. "CottageByTheSea&RainOnMyFace" is stronger and easier to remember than "P@55w0rd!".

Then turn on two-factor authentication (2FA). This means that even if someone gets your password, they can't log in without a second form of verification — usually a code from an app on your phone. Most email providers offer this, and there's really no good reason not to use it. We've written a full guide on setting up two-factor authentication for your business accounts if you'd like a step-by-step walkthrough.

Be extremely cautious with email attachments and links. If you receive an unexpected email asking you to click a link or open an attachment, verify it independently before doing anything. Pick up the phone and call the sender using a number you already have — not the one in the email.

Protecting Your Financial Accounts

Your business bank account and any payment processing accounts need the highest level of protection you can give them.

• Use separate passwords for every financial account. A password manager makes this manageable.
• Enable 2FA on every account that supports it. Banking apps typically require this already, but check your other financial tools too.
• Review transactions regularly. Don't just glance at the balance — look at individual transactions. The sooner you spot something suspicious, the better your chances of recovering the money.
• Set up transaction alerts. Most banks let you configure notifications for payments above a certain amount, international transfers, or new payee additions.
• Be wary of changing bank details. If a supplier or client emails to say their bank details have changed, always verify this by phone using a known number before making a payment. This single habit can prevent invoice fraud, which is one of the most damaging scams out there.

If you use Accounted for your bookkeeping, your bank feed gives you a real-time view of transactions coming in and out. Penny can flag unusual transactions or unexpected changes in spending patterns, giving you an early warning if something doesn't look right.

Keeping Your Devices Secure

Your laptop, phone, and tablet are all potential entry points for fraudsters. A few basic steps go a long way:

• Keep your operating system and software up to date. Updates often include security patches for newly discovered vulnerabilities. Enable automatic updates wherever possible.
• Install reputable antivirus software. Even on a Mac. The myth that Macs don't get viruses hasn't been true for years.
• Don't install software from untrusted sources. Stick to official app stores and the developer's own website.
• Use a screen lock. Set your devices to lock after a short period of inactivity, and use a strong PIN or biometric authentication (fingerprint or face recognition).
• Encrypt your hard drive. Both Windows (BitLocker) and macOS (FileVault) offer built-in encryption. If your device is stolen, encryption prevents the thief from accessing your data.
• Be cautious on public Wi-Fi. Avoid accessing sensitive accounts (banking, email) on public networks. If you need to, use a VPN (Virtual Private Network) to encrypt your connection.

Invoice and Payment Security

Invoice fraud is particularly nasty because it exploits trust. You think you're paying a legitimate supplier, but the money ends up in a criminal's account. By the time you realise, it's often too late to recover the funds.

Here are practical steps to protect yourself:

• Verify bank details independently. If you receive an invoice with bank details — especially if they've changed — call the supplier on a known number to confirm before paying.
• Use Confirmation of Payee. When setting up a new payment through your bank, the Confirmation of Payee service checks whether the account name matches the name on the payment. If it doesn't match, think twice.
• Be suspicious of urgency. Fraudulent invoices and payment requests often stress urgency — "pay immediately" or "your account will be suspended". Legitimate businesses rarely operate this way.
• Send invoices securely. If you send invoices to clients, consider using your accounting software's built-in invoicing rather than emailing PDF invoices that could be intercepted and altered.
• Reconcile regularly. Match your bank transactions to your invoices and receipts regularly. If a payment went somewhere unexpected, you'll catch it sooner. Accounted's bank reconciliation makes this quick and straightforward.

Training Yourself (and Anyone Who Helps You)

If you have a virtual assistant, a bookkeeper, or anyone else who accesses your business systems, they need to understand the basics of online fraud prevention too. You're only as secure as your weakest link.

Even if it's just you, it's worth staying informed. Fraudsters constantly evolve their techniques, and what looked obviously fake two years ago can look convincingly real today. A few ways to stay sharp:

• Follow Action Fraud (the UK's national reporting centre for fraud) for alerts about current scams.
• Check the NCSC website (National Cyber Security Centre) for guidance tailored to small businesses.
• Be sceptical by default. If something feels off — an unexpected email, a request that seems unusual, a deal that seems too good — trust your instincts and verify before acting.

For a broader view of digital security for your business, our guide on cyber security for sole traders covers the essentials in more detail.

What to Do If You're a Victim

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

1. Contact your bank immediately. If you've made a payment to a fraudster, your bank may be able to recall it or freeze the recipient's account. Time is critical.
2. Change your passwords. If you suspect an account has been compromised, change the password immediately and enable 2FA if you haven't already.
3. Report it to Action Fraud. You can file a report online at actionfraud.police.uk or call 0300 123 2040. This creates a crime reference number and feeds intelligence to law enforcement.
4. Report phishing emails to the NCSC. Forward suspicious emails to report@phishing.gov.uk.
5. Check for further damage. If one account has been compromised, check all your other accounts. Fraudsters often try to exploit access to one system to breach others.
6. Inform your clients and suppliers if necessary. If your email has been hacked, there's a risk that fraudulent messages have been sent from your account. Let your contacts know so they don't fall victim too.
7. Review and improve your security. After the dust settles, take stock of what happened and what you can do to prevent it in future.

Building Good Habits

Online fraud protection isn't a one-off project — it's an ongoing habit. The most effective defences are the ones you practise consistently:

• Check your bank transactions weekly (or more often if you process a lot of payments)
• Keep your software updated
• Use strong, unique passwords with a password manager
• Enable 2FA on every account that offers it
• Verify any request that involves money or sensitive information
• Back up your data regularly
• Stay informed about current scam techniques

None of these things take much time individually, but together they create a solid defence against the vast majority of online fraud. And when your financial records are well-organised — with all your transactions properly categorised and reconciled — you're far more likely to spot something amiss before it becomes a serious problem.

Related reading:

• Cyber Security for Sole Traders
• How to Spot a Phishing Email and Protect Your Business
• Password Managers — A Business Guide

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Accounted helps UK sole traders stay on top of their bookkeeping and tax. Start your free 30-day trial at getaccounted.co.uk.

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