Estimated reading time: 7 minutes
Accountancy firms hold some of the most valuable information a cybercriminal could target.
Client financial records, payroll information, personal data, tax documents, banking details and access to cloud accounting platforms can all make an accountancy practice an attractive target for phishing, ransomware, account takeover and other cyber attacks.
For accountants, cyber security therefore isn't simply an IT issue. A successful attack can disrupt your ability to work, expose confidential client information, create regulatory concerns and damage the trust clients place in your firm. Our IT support for accountants is designed around these security, continuity and day-to-day support requirements.
As an IT support provider working with accountancy practices, we often see the same security gaps appearing. The encouraging part is that many of them can be addressed without making IT unnecessarily complicated.
Good security starts with getting the fundamentals right and making sure those protections continue to work as your firm, staff and technology change.
Why Are Accountancy Firms Attractive Targets?
Accountants occupy a particularly sensitive position because they don't just hold their own business information. They may have access to financial and personal information belonging to dozens or hundreds of clients.
Staff also regularly receive invoices, spreadsheets, tax documents, payroll files and requests involving money or confidential information. That makes it easier for a convincing phishing email or fraudulent request to blend into normal working activity.
Accountancy practices increasingly depend on cloud services too, including Microsoft 365, accounting software, payroll platforms, document management systems and client portals. Each system needs appropriate access controls and security.
Rather than relying on one security product to protect everything, firms need several layers of protection working together.
1. Multi-Factor Authentication Is Essential
Passwords alone are no longer sufficient protection for important business accounts.
Multi-factor authentication (MFA) requires an additional form of verification when someone signs in. This can significantly reduce the likelihood of a stolen or compromised password being enough to access an account.
For an accountancy firm, MFA should be prioritised for email, Microsoft 365 or Google Workspace, accounting and payroll platforms, cloud storage, remote access systems and administrator accounts.
It is also important to review how MFA is configured. Simply having it enabled somewhere within the organisation doesn't necessarily mean every important account is protected.
2. Keep Systems Patched and Supported
Cybercriminals frequently exploit known vulnerabilities in software and operating systems. Once a vulnerability has been identified and a security update released, leaving that update unapplied can create an unnecessary opportunity for attackers.
Computers, servers, accounting applications, browsers and other business-critical software should therefore be kept supported and regularly updated.
For a growing accountancy practice, relying on individual employees to install updates when they remember isn't a particularly reliable strategy. Centralised patch management allows updates to be monitored and managed across the organisation.
Vulnerability scanning can provide another useful layer of visibility. Rather than waiting for a problem to appear, scanning tools can identify known vulnerabilities, missing patches and potentially insecure configurations across systems and devices.
The result is a clearer picture of where weaknesses exist and which issues should be prioritised.
3. Make Sure Your Backups Can Actually Be Recovered
Accountancy firms depend heavily on the availability and integrity of their data.
Backups provide an important safety net against ransomware, accidental deletion, hardware failure and other forms of data loss, but simply having a backup system isn't enough.
You need to know what is being backed up, how frequently backups run, where copies are stored and how quickly important information could be restored.
Backups should also be appropriately separated and protected so that an attacker who compromises your main environment cannot simply encrypt or delete the backups as well.
Most importantly, restoration should be tested.
A successful backup notification tells you that data was copied. A successful restore test tells you that you can actually get it back.
4. Train Staff to Recognise Phishing and Fraud
Your team works with email every day, which means employees are inevitably exposed to phishing attempts.
For an accountancy practice, these attacks can be particularly convincing. An email might appear to come from a client asking about a tax payment, a colleague sharing a document, Microsoft asking someone to sign in again, or a supplier providing new banking information.
Security awareness training helps staff recognise suspicious requests and understand what to do when something doesn't look right.
Phishing simulation exercises can complement that training by sending safe, controlled examples of phishing emails to employees. This gives firms an opportunity to identify where additional training may be needed without waiting for a genuine attack.
The objective shouldn't be to catch employees out. It should be to make spotting and reporting suspicious activity part of normal working behaviour.
5. Protect Every Device That Accesses Client Data
A firm's security is only as strong as the devices allowed to access its systems.
Desktop computers in the office are only part of the picture. Laptops, home-working devices, mobile phones and tablets may all access email, files or cloud applications containing client information.
Modern endpoint protection can help detect malware, ransomware and suspicious activity, but devices also need appropriate configuration, updates and access controls.
Remote and hybrid working makes this increasingly important. A laptop used away from the office still needs the same level of attention as a computer sitting on a desk inside the practice.
6. Control Who Can Access What
Not every member of an accountancy practice needs access to every client, system or piece of information.
The principle of least privilege means giving people the access they genuinely need to perform their role rather than providing broad access simply because it is convenient.
Permissions should also change when someone's responsibilities change.
When an employee joins, moves role or leaves the firm, there should be a clear process for creating, modifying and removing access. Dormant accounts belonging to former staff should not remain active indefinitely.
Administrator accounts deserve particular attention. They should be limited, protected with MFA and, wherever practical, separated from accounts used for ordinary day-to-day work.
7. Strengthen Email Security
Email is one of the most important security areas for an accountancy firm because it sits at the centre of communication with clients, suppliers and colleagues. Finance teams in particular should have clear processes for identifying phishing, invoice fraud and impersonation attempts. Read our guide to email security for finance teams for practical steps to reduce these risks.
Technical controls can help filter malicious messages, identify suspicious links and attachments and reduce impersonation attempts before they reach an employee.
Email authentication technologies such as SPF, DKIM and DMARC can also help protect your domain from certain forms of spoofing and impersonation.
Technology cannot eliminate every fraudulent email, however, which is why process matters too.
Requests to change supplier bank details, unusual payment instructions and unexpected requests involving confidential information should have clear verification procedures. A convincing email address or familiar display name should never be the only evidence that a sensitive request is genuine.
8. Know Which Devices Belong to Your Firm
You cannot properly secure devices you don't know exist.
Maintaining an accurate asset register helps an accountancy practice understand which laptops, desktops, mobiles and other devices are being used, who they are assigned to and whether they remain appropriately protected.
This becomes especially important as equipment moves between employees or staff work remotely.
The end of a device's life also needs to be managed properly. Simply putting an old laptop in a cupboard or disposing of it without securely removing the data can create an unnecessary information-security risk.
A clear retirement process should ensure business data is securely erased and equipment is disposed of appropriately.
9. Monitor Security Rather Than Waiting for Something to Go Wrong
Good cyber security isn't something that can be configured once and then forgotten.
Systems change, employees join and leave, new devices appear, software becomes outdated and attackers continually change their techniques.
Proactive IT support should therefore include monitoring and regular review, rather than simply waiting for someone to report a problem.
That might include monitoring endpoint protection, checking backup status, reviewing patching, investigating unusual login activity and periodically reviewing users, devices and permissions.
The aim is to identify warning signs and weaknesses before they turn into significant incidents.
10. Have a Plan for When Something Does Go Wrong
Even well-protected organisations need to prepare for the possibility of an incident.
If an employee's Microsoft 365 account was compromised tomorrow, would everyone know what to do? What if ransomware affected several computers? What if an important system became unavailable during a payroll or tax deadline?
An incident response and disaster recovery plan provides clear actions rather than requiring decisions to be made under pressure. If you don't already have one in place, our guide to building a disaster recovery plan for a small business explains the practical steps involved.
It should identify who needs to be contacted, which systems should be prioritised, how affected accounts or devices can be isolated and how important services and data will be recovered.
For a small accountancy practice, this doesn't need to become an enormous corporate document. A concise, tested plan that people understand is far more useful than a complicated plan nobody reads.
Cyber Security Is About Resilience, Not Just Technology
Strong IT security isn't achieved by purchasing one product or ticking a compliance box.
For accountancy firms, it comes from combining appropriate technology with sensible processes, informed employees and ongoing management.
MFA, patching, secure backups, endpoint protection and email security provide important technical layers. Access controls, staff awareness, asset management, monitoring and recovery planning help ensure those protections continue to work in practice.
Together, they make it substantially harder for a single mistake, compromised password or vulnerable device to become a major business incident.
Frequently Asked Questions
What IT security does an accountancy firm need?
The exact requirements depend on the size and structure of the practice, but the foundations should normally include multi-factor authentication, managed updates and patching, endpoint protection, secure backups, email security, controlled user permissions and security awareness training. These measures should be monitored and reviewed rather than simply installed once.
Why are accountants targeted by cybercriminals?
Accountancy practices hold valuable financial and personal information and regularly communicate about payments, tax, payroll and confidential documents. Attackers can exploit this combination of sensitive data and financial communication through phishing, account compromise, ransomware and impersonation fraud.
Is Microsoft 365 secure enough for an accountancy firm?
Microsoft 365 provides extensive security capabilities, but the security of an organisation's environment depends heavily on how those capabilities are configured and managed. MFA, administrator permissions, device security, email protection, monitoring and user access all need appropriate configuration.
Do accountancy firms need cyber security training?
Staff security awareness is an important part of protecting an accountancy practice. Employees regularly receive documents, links and financial requests by email, making them a frequent target for phishing and impersonation attacks. Regular awareness training and controlled phishing simulations can help employees recognise and report suspicious activity.
How often should an accountancy firm's IT security be reviewed?
Security should be monitored continuously, with more formal reviews carried out periodically and whenever there is a significant change to staff, systems, locations or working practices. User accounts, permissions, devices, patching and backup arrangements should all form part of the review.
Can an external IT support company manage cyber security for accountants?
Yes. An IT support provider can manage many of the day-to-day security requirements of an accountancy practice, including patching, endpoint protection, Microsoft 365 security, backups, user access, monitoring and security awareness. The important thing is choosing a provider that understands both the technology and the way your practice operates.
IT Support and Cyber Security for Accountancy Firms
For accountancy practices, reliable IT and cyber security ultimately support the same thing: the ability to work securely, protect client information and keep the firm operating without unnecessary disruption.
At Telanova, we provide IT support for accountants and accountancy firms across Berkshire, helping practices manage their technology securely and proactively.
Our Bracknell-based team supports businesses throughout the local area, including Bracknell, Wokingham, Reading and Ascot.
We can help review your current setup, identify gaps and put practical protections in place across Microsoft 365, devices, email, backups, access controls and day-to-day IT support.
If you're unsure whether your current IT environment provides the level of protection your practice needs, speak to Telanova on 01344 989 530 or explore our IT support for accountants service to find out how we can help.
