7 effective cybersecurity strategies your accounting firm should prioritise
What would happen if a compromised login granted a cyberattacker access to tax returns, TFNs, payroll records and banking details across your firm? That risk matters because your accounting practice holds sensitive client information across email, cloud platforms, accounting software and shared systems. A phishing email, a weak password, or overly broad user permissions can quickly lead to a client data breach. The question is not whether your firm uses technology, but whether the right safeguards are protecting it. So, which cybersecurity strategies should your firm prioritise?
This blog explains the risks, practical controls and accounting outsourcing checks worth reviewing now.
Key takeaways
Use multi-factor authentication across critical email, accounting platforms, storage, and remote access.
Restrict client data access so staff see only the information they need.
Patch software promptly and test backups before a cyber breach disrupts work.
Document cyber breach responsibilities before an incident forces rushed decisions.
Assess outsourcing providers for security controls before sharing sensitive client information externally.
Why accounting cybersecurity deserves attention in Australian firms?
Your firm handles the kind of information cybercriminals are actively seeking. In 2025, the OAIC received a record 1,205 data breach notifications, including 81 from legal, accounting and management services.
That matters because your systems may hold:
- TFNs and identity documents
- Bank details and tax returns
- Payroll and superannuation records
If access to even one of these systems is compromised, the impact can quickly spread across multiple client files. The TPB also warns that tax practitioners can be targeted for identity fraud, ransomware and the theft of personal information.
That is why accounting cybersecurity needs to sit alongside your firm’s other risk controls. Australian Signals Directorate cyber security guidance outlines practical steps organisations can take to strengthen cyber resilience.
Worried one weak access point could expose sensitive client data?
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Cyber breach and data-security obligations for Australian accounting firms
The following are the key data-security and cyber breach obligations Australian accounting firms should understand:
- APP 11: If your firm is an APP entity, you must take reasonable technical and organisational steps to protect personal information from misuse, loss and unauthorised access, modification or disclosure. The OAIC says this can include access controls, staff training, ICT security and controls over third-party providers.
- Privacy (Tax File Number) Rule 2015: If your firm receives or controls TFN information, access must be limited to people who genuinely need it for taxation, superannuation or related authorised purposes. Reasonable steps must also be taken to protect TFNs from loss, misuse or unauthorised access.
- Notifiable Data Breaches scheme: If your firm is covered and suspects an eligible data breach, you must take reasonable steps to complete the assessment within 30 days. If serious harm is likely, the OAIC and affected individuals may need to be notified.
- TPB confidentiality obligations: Registered tax practitioners must not disclose information about a client’s affairs to a third party without the client’s permission, unless there is a legal duty to do so. The TPB specifically treats outsourced providers as third parties for this purpose.
- TPB significant breach reporting: If a registered tax practitioner has reasonable grounds to believe a significant Code breach has occurred, it must generally be reported to the TPB within 30 days.
These obligations matter before client data is shared outside your firm, not just after something goes wrong. Before appointing external accountants, check security controls, client permissions, access limits and breach procedures alongside technical capability. Our guide to choosing an outsourced accounting partner explains what to assess.
Pro Tip
Before sharing client data externally, document who can access it, how access is restricted and what happens if suspicious activity is detected.
5 common cyber threats behind accounting cybersecurity incidents
Cyber threats do not always start with a major system failure. Many start with everyday activities such as opening emails, making payments, sharing files, or giving staff access to client information.
For accounting firms, this adds risk because one compromised account may expose sensitive information such as TFNs, payroll records, tax returns, or banking details.
The table below explains five common cyber threats, what they could mean for your firm and the control that can help reduce the risk.
| Cyber threats Australian accounting firms should prepare for | ||
|---|---|---|
| Cyber threat | What it means for your firm | Priority control |
| Phishing or email compromise | A staff member may click a fake link or enter login details into a fraudulent website. An attacker could then access email accounts, steal information or redirect client payments. | Use multi-factor authentication and verify payment requests before changing bank details or transferring funds. |
| Ransomware | Malicious software can lock your systems or files, making client records unavailable when your team needs them. This can delay work and disrupt deadlines. | Keep software updated, apply security patches promptly and maintain tested backups that can be restored if needed. |
| Identity or tax-data theft | Stolen TFNs, identity documents or other personal details may be used for fraud or unauthorised activity. | Limit access to sensitive information and monitor who can view or use client data. |
| Excessive internal access | Staff may have access to more client information than they need for their role, increasing the risk of accidental or unauthorised disclosure. | Use role-based permissions, apply least-privilege access and remove access promptly when responsibilities change, or staff leave. |
| Third-party compromise | A software provider, contractor or external service provider may become another pathway into your systems or client information. | Review provider security controls, restrict the information they can access and regularly review permissions. |
Top 5 cybersecurity strategies for Australian accounting firms
The following are five cybersecurity strategies your accounting firm can prioritise to protect client data, reduce common security gaps and improve its response if an incident occurs.
1. Multi-factor authentication for critical accounting systems
Use multi-factor authentication on email, accounting software, document storage, remote access and privileged accounts. If a password is stolen, MFA adds another barrier before an attacker can gain access.
2. Essential Eight patching and software updates
The Essential Eight framework is a set of eight practical cybersecurity measures developed by the Australian Signals Directorate to help organisations reduce common cyber risks.
One of these measures is keeping software up to date. Your firm should regularly update operating systems, browsers, accounting software and remote-access tools so known security weaknesses are fixed before attackers can take advantage of them.
3. Cybersecurity tips for least-privilege access
Give each person only the access needed for their role. For example, a payroll accountant may need payroll records but not every client’s tax file. Junior staff should not automatically receive administrator access simply because it is convenient.
4. Tested backups for cyber breach recovery
Keep protected backups separate from your main systems and test that you can restore them. A backup that has never been tested may not help your firm when ransomware or a system failure interrupts access.
5. Accounting cybersecurity controls for client portals and systems
Use individual logins, encrypted file sharing, role-based permissions and activity monitoring across client portals and accounting systems. Avoid shared credentials and uncontrolled downloads so access to sensitive client information stays traceable and limited.
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Strategies we use to protect client data when you outsource accounting work
When accounting work moves outside your office, your firm still needs clear cyber security and data security controls around who can access client information, how that access is managed and what safeguards are in place.
At AccountGlobal, our framework includes:
- ISO 27001 certification: documented information-security controls.
- Role-based permissions: access limited to assigned responsibilities.
- Multi-factor authentication: added verification on supported systems.
- Client-managed access: your firm controls the information made available.
- Restricted local storage: controls designed to limit unauthorised copying.
- Backups, monitoring and patching: systems are maintained for security and recovery.
- Staff security procedures: confidentiality and data-handling requirements apply.
These cybersecurity strategies support the way our accountants handle bookkeeping, reconciliations, payroll, BAS preparation, financial statements, and draft tax returns within agreed access and review procedures.
Also, see how offshore accounting can support client growth while your firm retains final review and oversight.
Data security should remain a key consideration when extending accounting work beyond your internal team.
Contact us today to discuss suitable tasks, access controls and the security measures you want built into your workflow.
FAQs about cybersecurity strategies for accounting firms
1. What are the ATO’s data security requirements for accountants?
The ATO’s Operational Security Framework applies to in-scope digital service providers, not every accounting firm. Covered services must meet requirements for authentication, audit logging, encryption, monitoring and related controls, with multi-factor authentication required in specified environments only.
2. Is the Essential Eight mandatory for accounting firms?
No. The Essential Eight is recommended, not generally mandatory for private accounting firms. ASD says Maturity Level One may suit small to medium enterprises, while firms should select a maturity target that reflects their systems, environment and cyber-risk exposure.
3. Is multi-factor authentication mandatory for accountants in Australia?
MFA is mandatory in some ATO-connected environments, but not across every system accountants use. ACSC recommends MFA for important accounts, so firms should enable it across email, accounting platforms, cloud storage and remote access wherever the technology supports it.
4. How does an accounting firm comply with the NDB scheme?
If the NDB scheme applies and you suspect an eligible breach, assess it and take reasonable steps to complete that assessment within 30 days. If serious harm is likely, notify the OAIC and affected individuals as soon as practicable.
5. Which client data should an accounting firm protect first?
Prioritise TFNs, identity documents, bank details, tax returns, payroll records and account credentials. Restrict access by role, protect information during storage and transfer, monitor unusual activity, and securely remove data when your firm no longer needs to retain it.
Final thoughts on cybersecurity strategies for accounting firms
Cybersecurity for accounting firms depends on how well your people, systems and external partners work together. When your internal team is stretched, moving suitable preparation work to a trusted provider can help separate routine tasks from higher-risk review and decision-making.
AccountGlobal supports bookkeeping, BAS, payroll and tax preparation within structured workflows that use clear access limits, agreed processes and your firm’s existing controls. Your team keeps visibility and final review while routine work is handled consistently.
If outsourcing could ease your workload, what data security checks would you want in place before sharing client data with an external team?
Book a call with AccountGlobal to discuss secure outsourced accounting workflows, access controls and the data security measures you want built into them.
