Your clients trust you with some of their most sensitive information: financial records, personal details, payroll data, tax documentation and, in some cases, access to banking or cloud accounting systems. That makes cybersecurity part of the service you provide, not simply an IT issue in the background.

For a busy accountancy practice, the greatest danger is rarely one dramatic technical failure. Risk builds through everyday decisions: a convincing email, an old user account, an unexpected login prompt, an untested backup or a supplier with more access than they need.

Here are seven areas every accountancy firm should review, along with practical questions to ask.

1. Phishing that arrives at the busiest possible moment

Attackers know that urgency changes behaviour. A message that appears to come from a client, senior partner, software provider or HMRC can be especially persuasive near payroll runs, filing deadlines or periods of heavy client activity. The aim may be to steal a password, obtain a session approval, redirect a payment or deliver malicious software.

Review: Can staff recognise unusual urgency, unexpected attachments, changed payment instructions and requests to bypass normal procedures? Do they know exactly how, and where, to report a suspicious message?

2. Weak or inconsistent account protection

Cloud systems make collaboration easier, but a stolen login can give an attacker access from anywhere. Multi-factor authentication materially strengthens an account, yet protection may be inconsistent across email, cloud accounting, document portals, remote access and administrator accounts. Shared accounts also make it difficult to establish who did what.

Review: Is multi-factor authentication enforced for every user and every important service? Are administrator privileges limited? Does each person have a named account?

3. Fraudulent payment or bank-detail changes

A compromised mailbox can be used to monitor genuine conversations and insert a believable request at precisely the right time. Because the message may appear inside a real email chain, it can look more credible than a conventional phishing email.

Review: Is every new or changed payment instruction verified through a separate, trusted channel? Are staff empowered to pause an urgent request, even when it appears to come from a senior person or important client?

4. Excess access and forgotten accounts

People change roles, contractors finish projects and employees leave. If access is not reviewed promptly, old accounts and excessive permissions create avoidable routes into client data. The same principle applies internally: not everyone needs access to every client folder, mailbox or finance system.

Review: Is there a documented joiner, mover and leaver process? Are access rights reviewed regularly and removed immediately when no longer required?

5. Sensitive information shared through the wrong channel

Emailing spreadsheets and identification documents may feel convenient, but convenience can lead to misaddressed messages, uncontrolled copies and unclear retention. Personal cloud storage or consumer messaging tools can create further blind spots.

Review: Does the firm provide a simple, approved way to exchange confidential information? Do staff understand which channels are acceptable, and is sensitive information protected during transfer and storage?

6. Backups that have never been tested

Having a backup is not the same as being able to recover. A ransomware incident, accidental deletion or system failure becomes far more disruptive when recovery times, responsibilities and dependencies have never been tested. For accountancy firms, timing matters: several days without access can collide with payroll and statutory deadlines.

Review: Are backups protected from the same compromise as live systems? When was a full restoration last tested? Does the practice know which systems must return first?

7. Annual training that does not change behaviour

A once-a-year course may satisfy a calendar reminder, but threats and working habits change continuously. Effective awareness is short, relevant and reinforced. It should help staff practise decisions, report mistakes quickly and learn from realistic simulations without creating a culture of blame.

Review: Can the firm show whether training has reduced risky behaviour? Are higher-risk users given appropriate support? Do leaders receive clear reporting rather than completion rates alone?

A practical first step

Cyber Essentials is another practical step accountancy firms can take to strengthen their security and demonstrate that protecting client information is taken seriously. The UK government-backed certification provides a clear framework for addressing common cyber threats, covering important controls such as secure system configuration, access management, malware protection, firewalls and security updates.

Achieving certification can help reassure existing clients, support conversations with prospective clients and strengthen your position when completing supplier questionnaires, tendering for work or reviewing cyber insurance requirements. It also gives your firm a valuable opportunity to identify weaknesses before they become incidents. Ashdown Solutions can guide you through the Cyber Essentials process, help you understand what needs to change and support you in working towards certification without unnecessary complexity.

Read more about Cyber Essentials and how Ashdown Solutions can help your firm.

If you would prefer to discuss cybersecurity, Cyber Essentials or wider IT support for your practice, contact Ashdown Solutions.