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Technology

Cybersecurity Risks in Tax Technology and How Nigerian Firms Can Stay Protected

January 11, 2026
The digital transformation of the accounting industry has brought unprecedented efficiency, especially in tax preparation and filing. However, this reliance on tax technology from cloud-based software to secure client portals also introduces a critical set of cybersecurity challenges. For organizations handling highly sensitive financial and personal data, protecting these digital assets is no longer optional; it's the foundation of client trust and regulatory compliance.
Tax season, in particular, has become peak hunting season for cybercriminals, with attacks on accounting firms surging as workloads increase and vigilance drops.

The Top Cybersecurity Risks in Tax Technology

Cybercriminals are sophisticated, targeting both large and small firms with a variety of attack vectors. Here are the most prominent risks your firm must actively defend against:

  1. Phishing and Social Engineering

This is overwhelmingly the initial entry point for most breaches. Threat actors send deceptive emails (phishing) or use voice calls (vishing) that mimic trusted entities like the IRS, QuickBooks, or a firm executive. Their goal is to trick employees into:
  • Clicking on malicious links that download malware or ransomware.
  • Revealing login credentials or two-factor authentication codes.

  1. Ransomware and Malware

Once an attacker gains access, often via a phishing link or an unpatched vulnerability, they can deploy ransomware. This malicious software encrypts your files and systems, holding critical client data hostage until a ransom is paid. The disruption, downtime, and cost of recovery can be catastrophic. Malware can also be installed to steal usernames, passwords, and other confidential data over time.

  1. Third-Party and Cloud Vulnerabilities

Modern tax practices rely on a network of external services: cloud-based tax software, e-signature platforms, and managed IT services. If one of your vendors a third-party partner suffers a breach due to an unpatched system or weak security, your firm's data can be exposed. Furthermore, misconfigurations in cloud environments remain a significant security gap.

  1. Insider Threats

Not all threats come from outside. Insider threats stem from employees, contractors, or other personnel. This can be malicious (intentionally leaking data) or, more commonly, accidental (negligently clicking a link, using an unsafe mobile connection, or mishandling sensitive files). Given that 95% of cybersecurity breaches are reportedly due to human error, staff training is paramount.

  1. Outdated Software and Weak Access Controls

Failing to regularly update tax software, operating systems, and network hardware leaves systems vulnerable to known exploits. Equally dangerous is a lack of strict access controls and reliance on weak passwords, which are easily guessed or compromised, giving attackers an effortless entry into your sensitive systems.
Read more: Cybersecurity as a Boardroom Priority: Moving from IT to Strategic Risk

How Firms Can Stay Protected: Best Practices

Protecting client data requires a multi-layered, proactive security strategy. A single firewall or antivirus won't cut it.

  1. Establish an Unbreakable Digital Foundation

  • Mandatory Multi-Factor Authentication (MFA): This is the single most effective defense against unauthorized access. Make MFA mandatory for all systems email, tax software, client portals, and VPNs. It requires users to verify their identity using a second factor (like a mobile code or authenticator app) in addition to a password.
  • Encrypt Everything: Ensure all sensitive data is encrypted at rest (on your servers or cloud storage) and in transit (when being sent to a client or vendor).
  • Strong Password Protocols: Enforce the use of complex, unique passwords (at least 12 characters with a mix of types) and require the use of a secure password manager for all staff.

  1. Prioritize Data and System Resilience

The 3-2-1 Backup Rule: To mitigate the damage of a ransomware attack, you must be able to restore your data.
  • Keep 3 copies of your data (the primary and two backups).
  • Store them on 2 different types of media (e.g., local server and cloud).
  • Ensure 1 copy is kept off-site or offline (air-gapped).
Keep Software Patched and Updated: Implement a policy for automatic, timely patching of all operating systems, antivirus software, and tax-specific applications to close known security gaps. Implement Role-Based Access Control (RBAC): Limit employee access to only the specific data and systems absolutely necessary for their job function. This minimizes the scope of a breach if an account is compromised.

  1. Invest in People and Processes

  • Continuous Cybersecurity Training: Since human error is the top vulnerability, frequent, mandatory training is essential. Teach employees to spot phishing, recognize social engineering tactics, and report suspicious activity immediately.
  • Due Diligence on Vendors: All third-party software and IT providers must adhere to your firm’s security standards. Conduct regular security assessments of your vendors to manage supply chain risks.
  • Develop an Incident Response Plan: No system is impenetrable. Have a comprehensive, documented plan detailing the immediate steps to take in the event of a breach, including roles, communication protocols, data recovery steps, and client notification procedures. Test this plan regularly.

  1. Maintain Compliance and Oversight

  • Security Audits and Penetration Testing: Hire third-party experts to conduct annual security audits, vulnerability scans, and simulated attacks (penetration tests) to identify and address weaknesses before criminals exploit them.
  • Formal Written Information Security Plan (WISP): Create a formal document outlining all security policies and procedures, as this is often required for compliance with industry regulations and standards.
  • By treating cybersecurity as a year-round, top-tier priority, not just a tax-season concern, your firm can build the resilience needed to protect client data, maintain trust, and safeguard your reputation in the digital age.
  • Read more: One Law, Two Scripts: Navigating the Material Discrepancies in the Nigeria Tax Act 2025 - Eben Joels
  • Conclusion
  • The stakes are too high to leave your firm’s security to chance. At Stransact Chartered Accountants, we provide specialized cybersecurity and tax technology services designed to protect your most sensitive assets. From implementing Multi-Factor Authentication and robust encryption to developing Written Information Security Plans (WISP) and conducting staff training, we ensure your firm is defended against the latest threats.
  • Do not wait for a breach to take action. Contact us today at [email protected] to schedule a security assessment and let us help you build a secure, resilient digital environment for your tax operations.

Get in touch

image of Eben Joels, principal partner in stransact, wearing a bright colored shirt and tie.

Eben Joels

Partner | Stransact

[email protected] +1 (978) 501-7900

Victor Athe wearing a suit with his two hands supporting his chin.

Victor Athe

Partner | Stransact

[email protected] +234 803 598 0250