IT Support for Accountants: A 2026 Security & Compliance Checklist for UK Firms

Why IT Security Is Now a Core Compliance Requirement for UK Accounting Firms

Accounting firms sit at the intersection of sensitive personal data, financial records, and regulatory obligations. That makes them a prime target for cybercriminals — and a firm focus for regulators. With HMRC's Making Tax Digital programme continuing to expand, GDPR enforcement intensifying, and threats like ransomware evolving rapidly, the bar for IT security in accountancy practices has never been higher.

This checklist is designed for partners, office managers, and managing directors at UK accounting firms who want a clear, practical picture of where they stand — and what needs to change before problems arise.

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1. Conduct a Formal IT Audit for Your Accounting Firm

Before you can fix vulnerabilities, you need to know they exist. An IT audit for accounting firms should cover:

• Hardware inventory — which devices connect to your network, who owns them, and whether they're still receiving security updates
• Software licensing and versions — outdated software is one of the most common entry points for attackers
• Access control review — who has access to what, and whether any former employees still have active credentials
• Data storage and backup — where client financial data lives, how frequently it's backed up, and whether backups are tested

At Coreitech, we recommend scheduling a structured IT audit at least once a year — ideally ahead of a new tax year when systems are under the most strain.

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2. Strengthen Your GDPR Compliance Posture

GDPR compliance for accounting firms is not a one-time exercise. The ICO has made clear that ongoing accountability is expected, not just initial sign-off.

Key actions for 2026:

• Review your data retention policies. Are you holding client data longer than necessary? Under GDPR, you must be able to justify retention periods.
• Update your privacy notices. If your firm has adopted new software or changed how you process data in the last 12 months, your notices may be out of date.
• Document your lawful basis for processing. For accounting firms, this is often a contractual necessity or legal obligation — but it must be recorded.
• Ensure data processor agreements are in place. Every cloud platform, payroll provider, or third-party tool you use that handles personal data needs a signed Data Processing Agreement (DPA).
• Test your breach response procedure. The ICO requires notification within 72 hours of becoming aware of a qualifying breach. Does your team know what to do?

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3. Secure Your Accountancy Practice Against Cyber Threats

Cyber security for accountancy practices deserves dedicated attention. The National Cyber Security Centre (NCSC) consistently identifies professional services firms — including accountants — as high-value targets due to the volume of sensitive financial data they hold.

Implement these controls as a baseline:

• Multi-factor authentication (MFA) on all systems, including email, cloud platforms, and accounting software portals. This single step prevents the majority of credential-based attacks.
• Email filtering and anti-phishing tools. Phishing remains the number one attack vector. Invest in a solution that goes beyond basic spam filtering.
• Endpoint detection and response (EDR). Traditional antivirus is no longer sufficient. EDR tools monitor behaviour across devices in real time.
• Privileged access management. Staff should only have access to the data and systems they need for their specific role — no more.
• DNS filtering. This blocks access to malicious websites before a connection is even established, providing a crucial layer of protection.

If your firm achieves Cyber Essentials certification, you demonstrate to clients and insurers that you meet a government-backed baseline for cyber security. For firms handling higher volumes of sensitive data, Cyber Essentials Plus offers an independently verified level of assurance.

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4. Review Your Accounting Software Support and Integrations

Accounting software support in the UK has become increasingly complex as firms adopt cloud-based tools, integrate third-party apps, and work across multiple platforms simultaneously. Common issues that create security and compliance risks include:

• Unmanaged integrations between platforms like Xero, QuickBooks, or Sage and third-party apps that haven't been vetted
• Shared login credentials used by multiple members of staff — a common workaround that undermines accountability and audit trails
• Automatic updates disabled to avoid workflow disruption, leaving known vulnerabilities unpatched
• No offboarding process for software platforms when staff leave

Ensure your IT provider has experience with the specific platforms your practice relies on. Generic IT support is not sufficient when accountancy-specific workflows and compliance requirements are involved.

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5. Establish a Resilient Backup and Disaster Recovery Strategy

For an accounting firm, data loss is not just an operational inconvenience — it's a regulatory and reputational risk. Your backup strategy should follow the 3-2-1 rule: three copies of data, on two different media types, with one stored offsite or in the cloud.

Beyond backups, consider:

• Recovery time objectives (RTO): How quickly do you need to be back up and running after an incident?
• Recovery point objectives (RPO): How much data can you afford to lose? An hour's worth? A day's?
• Regular restore tests: A backup that hasn't been tested is not a reliable backup.

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6. Train Your Team — Regularly and Specifically

Technology controls are only as effective as the people operating them. Human error remains the leading cause of data breaches across all sectors.

Staff training for accountancy practices should cover:

• Recognising phishing and spear-phishing attempts (including those targeting HMRC or Companies House communications)
• Safe handling of sensitive client documents — both digital and physical
• Secure use of mobile devices and home working setups
• Clear reporting procedures when something looks suspicious

Training should not be an annual tick-box exercise. Short, regular sessions — even 10 minutes monthly — are significantly more effective at changing behaviour.

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7. Review Your IT Support Arrangement

Finally, consider whether your current IT support arrangement is genuinely equipped to meet the demands of a modern accountancy practice. Managed IT services for accountants should offer:

• Proactive monitoring rather than reactive break-fix support
• Clear SLAs with defined response times
• Experience with GDPR and FCA-adjacent compliance requirements
• Alignment with NCSC guidelines and support for frameworks like Cyber Essentials

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Take the Next Step

This checklist is a starting point — not a complete solution. Every firm has different systems, risk profiles, and compliance obligations. What matters is that you don't wait for an incident to trigger action.

If you'd like an honest conversation about where your practice stands on security and compliance, Coreitech works with accounting firms across London and the UK to put the right IT foundations in place.

Call us on 0203 834 9728 or email sales@coreitech.co.uk to arrange a no-obligation IT review. We'll help you identify the gaps and build a practical plan to address them — before they become a problem.