How Law Firms And Accountants Can Improve Data Security

Law firms and accountancy practices handle some of the most sensitive data in the business world. From financial records to confidential client communications and legal case files, the information they store is highly valuable, not just to clients, but to cybercriminals as well.

These professional services firms are increasingly targeted by cyber attacks because they often hold large volumes of regulated data but don’t always have enterprise-level cybersecurity in place. 

Improving data security requires a structured, consistent approach built around risk reduction, staff awareness, and the right technology. Here’s how IT support for accountants and law firms can significantly improve their data security posture.

1. Recognise why you’re a target

The first step is understanding the threat landscape.

Cybercriminals often target professional services because:

• They store financial and identity data (ideal for fraud)
• They handle confidential legal documents
• They are time-sensitive businesses (increasing pressure to pay ransom)
• They often have multiple external communication channels

For law firms, case files, client disputes, and contracts are particularly sensitive. For accountants, payroll data, tax records, and bank details are high-value targets.

This makes both sectors prime candidates for phishing attacks, ransomware, and business email compromise (BEC).

2. Strengthen email security 

Most successful cyber attacks still begin with email.

Law firms and accountants should implement:

• Advanced spam and phishing filtering
• Domain authentication 
• Attachment sandboxing (to detect malicious files before opening)
• Warning banners for external emails

BEC is especially dangerous in these industries. A single spoofed email requesting an ‘urgent payment change’ or ‘new bank details’ can result in significant financial loss.

A strong email security setup reduces this risk dramatically, but it must be actively monitored and regularly updated.

3. Enforce multi-factor authentication everywhere

Passwords alone are no longer enough.

Multi-Factor Authentication (MFA) should be mandatory for:

• Email systems (Microsoft 365 or Google Workspace)
• Accounting software (such as cloud bookkeeping platforms)
• Case management systems
• Remote access tools (VPNs or cloud desktops)

Even if credentials are stolen, MFA can prevent attackers from gaining access. In professional services, this is one of the simplest and most effective security upgrades available.

4. Secure client data with access controls

Not every employee needs access to every file. Implementing role-based access control ensures staff only see what they need to do their job. This reduces internal risk and limits damage if an account is compromised.

Best practice includes:

• Separating client folders by team or department
• Restricting admin access
• Regularly reviewing permissions
• Removing access immediately when staff leave

This is especially important in larger firms or multi-office practices.

5. Encrypt sensitive data (at rest and in transit)

Encryption ensures that even if data is intercepted or stolen, it cannot be read without the correct key.

Law firms and accountants should ensure:

• All laptops and devices are encrypted
• Cloud storage is encrypted
• Email attachments containing sensitive data are protected
• Secure file-sharing portals are used instead of email attachments where possible

This is increasingly important for GDPR compliance and client trust.

6. Keep systems and software updated

Outdated software is one of the most common entry points for cyber attacks.

Firms should ensure:

• Operating systems are automatically updated
• Accounting and legal software is patched regularly
• Firewall firmware is current
• Legacy systems are replaced or isolated

Many attacks exploit known vulnerabilities that already have fixes available. Delaying updates creates unnecessary risk.

7. Train staff to recognise threats

Human error remains one of the biggest cybersecurity vulnerabilities.

Regular training should cover:

• How to identify phishing emails
• How to verify payment requests
• Safe handling of client data
• Reporting suspicious activity

Staff should feel confident questioning unusual requests, even if they appear to come from senior colleagues or trusted clients. Short, regular training sessions are often more effective than one-off annual workshops.

8. Implement strong backup and recovery systems

Ransomware attacks can lock firms out of critical data entirely.

A strong backup strategy should include:

• Automated daily backups
• Offsite or cloud-based storage
• Immutable (tamper-proof) backups
• Regular recovery testing

Backups should not just exist; they should be tested. Many organisations only discover backup failures when it’s too late.

9. Monitor networks proactively

Rather than reacting to incidents, firms should actively monitor their systems.

This includes:

• 24/7 threat monitoring
• Firewall logging and alerts
• Suspicious login detection
• Endpoint protection across all devices

Managed IT support providers often deliver this as part of a wider cybersecurity service, helping smaller firms access enterprise-grade protection.

10. Consider cyber essentials certification

For law firms and accountants, Cyber Essentials (or Cyber Essentials Plus) is becoming increasingly important.

It helps demonstrate:

• A baseline level of cybersecurity
• Compliance with client expectations
• Reduced risk of common cyber threats

It can also be a requirement for working with certain public sector or larger corporate clients.

Data security is now a core business risk that affects reputation, compliance, and financial stability. The firms that take cybersecurity seriously are not only better protected but also more trusted by clients.