Your clients trust you with their most sensitive financial information.
Accounting firms hold client tax file numbers, superannuation details, business financials, and personal income data. That responsibility carries real obligations — under the Tax Agent Services Act, the Privacy Act, and the ATO's data security requirements for registered tax agents. Your technology has to hold up to that responsibility without interrupting the work your clients pay you for.
IT challenges in accounting practices
Practice software fragmentation
Xero, MYOB, BGL Simple Fund 360, HandiSoft, and Class Super all run alongside Microsoft 365 — but they were not designed to integrate with each other. Managing identity, access, and data across multiple systems creates gaps that attackers exploit. Most accounting firms have no single source of truth for who has access to what.
ATO and TPB compliance obligations
The Tax Practitioners Board requires registered tax agents to maintain reasonable data security arrangements under APP 11 of the Privacy Act. The ATO's data-matching program means accounting firms are a direct target for credential theft — attackers who compromise a tax agent's system gain access to every client's tax affairs. Meeting ATO security guidance is no longer optional for registered agents.
Ransomware and business email compromise
Accounting firms are among the most targeted professional services businesses in Australia for ransomware. Access to client bank accounts, superannuation funds, and tax refund destinations makes a compromised accounting firm immediately monetisable. BEC attacks targeting accounting firms typically impersonate clients requesting changes to bank account details — a single successful attack can result in a six-figure loss.
Cyber insurance requirements at renewal
Professional indemnity and cyber insurance policies for accounting firms increasingly require evidence of Essential Eight Maturity Level 2 controls at renewal. Firms that cannot demonstrate MFA, patching compliance, and application control face premium increases or coverage exclusions. Insurers are asking for documented evidence — not just a declaration.
Legacy file servers and document chaos
Many accounting practices still run on-premise file servers with shared drives, inconsistent folder structures, and no version control. Client workpapers, correspondence, and tax returns are spread across email, shared drives, and practice management systems with no audit trail. When a staff member leaves, their access is rarely reviewed systematically.
Staff turnover and access management
Accounting firms experience high staff turnover, particularly at junior levels. Without a centralised identity platform, onboarding and offboarding is manual and inconsistent. A former employee whose Microsoft 365 account was not deprovisioned retains access to client files, Xero integrations, and email indefinitely.
What success looks like
When IT is done right for an accounting practice, your team works the way they need to — from the office, from home, and from client sites — without security incidents, compliance gaps, or technology disruptions getting in the way.
- Client data protected and access controlled
- ATO and TPB compliance evidence ready at any time
- Xero, MYOB, and BGL running on a secure managed platform
- Ransomware and BEC protections in place
- Insurance renewal evidence available without scrambling
- Staff onboarded and offboarded cleanly and completely
A simple plan to get there
Understand
We assess your Microsoft 365 environment, practice software integrations, and security posture against ATO and TPB requirements — and produce a plain-language gap report.
Fix
We resolve the underlying problems — identity, access control, backup, endpoint security, and practice software integration — and establish a secure modern foundation.
Improve
We manage, monitor, and continuously improve your technology environment on a fixed monthly fee — with a named account manager and unlimited helpdesk.
Microsoft 365 for accounting practices
Australian accounting firms run a specific stack of practice management software alongside Microsoft 365 — Xero (client portal, Practice Manager, Workpapers), MYOB Practice and AccountRight, BGL Simple Fund 360 for SMSF administration, Reckon Accounts, and HandiSoft. All of these integrate with or sit alongside Microsoft 365 Outlook, Teams, SharePoint, and OneDrive. Mycelium 365 manages the underlying Microsoft 365 platform — identity (Entra ID), device management (Intune), email, and file storage — so practice management software runs on a secure, compliant foundation. Key compliance drivers include TPB (Tax Practitioners Board) obligations for registered tax agents, Privacy Act APP 11 (client financial data security), and the ATO's data security requirements for tax agents.
Microsoft Defender and managed cybersecurity
Enterprise-grade threat protection across all endpoints, email, and cloud apps — with built-in compliance tools covering DLP, retention, and audit for ATO and TPB obligations.
- Endpoint detection and response
- Business email compromise protection
- Data loss prevention (DLP) for client financial data
- Ransomware detection and automated isolation
Microsoft Entra identity security
Centralised identity management with Conditional Access, MFA, and lifecycle workflows — ensuring only the right people access Xero, MYOB, and client workpapers, and that departing staff are offboarded completely.
- Conditional Access policies for practice software
- Multi-factor authentication for all staff
- Automated offboarding via Entra ID lifecycle workflows
- Risk-based sign-in detection
Microsoft Intune device management
Managed device compliance for all firm-owned and BYOD devices — ensuring staff accessing Xero and client files from home or client sites meet the firm's security baseline.
- Device compliance policies
- Remote wipe for lost or stolen devices
- Application deployment and patching
- BYOD separation of personal and firm data
SharePoint and OneDrive document management
Replace legacy file servers with SharePoint Online — purpose-built for client workpaper management with version control, granular permissions, and a full audit trail.
- Client-centric site structure in SharePoint
- Granular permissions and external sharing controls
- Version history and audit trails
- Integration with Xero and MYOB Practice
Azure Backup and disaster recovery
Immutable, geo-redundant backup of all Microsoft 365 data — Exchange Online, SharePoint, OneDrive, and Teams — with a tested recovery plan so a ransomware event does not become a practice-ending event.
- Microsoft 365 backup independent of Microsoft's native retention
- Azure Backup with Australian data residency
- Recovery time objective (RTO) tested and documented
- Ransomware-resilient immutable backup storage
Cyber security for accounting firms
Accounting firms hold client tax file numbers, bank account details, and superannuation information — making them high-value ransomware and business email compromise targets. The ATO requires tax agents to maintain a cyber security standard consistent with Essential Eight Maturity Level 1 minimum. Most professional indemnity and cyber insurance policies for accounting firms now require Essential Eight Maturity Level 2 at renewal. Mycelium 365 delivers Essential Eight gap assessments and remediation tailored to accounting firm environments running Xero and MYOB on Microsoft 365. Review your cyber insurance controls and check your Essential Eight baseline.
Managed IT pricing for accounting firms
Mycelium 365's Secure Essentials package starts at $95/user/month and covers managed Microsoft 365, unlimited helpdesk, Defender security monitoring, and Azure Backup. For sole-practitioner accountants and small bookkeeping firms, there is no minimum user count above 5 users. All packages are month-to-month with no lock-in contracts. View pricing packages or contact us.
Real-world use cases for accounting firms
Sole-practitioner accountant — Xero on Microsoft 365, Essential Eight ML1
A sole-practitioner accountant in Melbourne running Xero Practice Manager and MYOB AccountRight needed to meet ATO security guidance and pass a professional indemnity cyber insurance renewal requiring MFA and endpoint protection. Mycelium 365 deployed Microsoft 365 Business Premium with Entra ID MFA, Intune device compliance, and Defender for Business — achieving Essential Eight Maturity Level 1 within four weeks. The accountant now has a cyber insurance renewal evidence pack generated automatically from Microsoft Secure Score.
Mid-size accounting firm — BGL Simple Fund 360, SharePoint migration, staff offboarding
A 22-staff Melbourne accounting firm running BGL Simple Fund 360 for SMSF administration had client workpapers scattered across a legacy on-premise file server, individual Dropbox accounts, and email attachments. Mycelium 365 migrated all client workpapers to SharePoint with a client-centric folder structure, replaced the file server with Azure infrastructure for BGL, and implemented Entra ID lifecycle workflows to automate offboarding. Staff turnover no longer creates lingering access risks and the firm passed its next audit without remediation.
Boutique tax agent — TPB compliance, ransomware response plan
A boutique tax agent with 8 staff experienced a phishing attack that compromised one staff member's Microsoft 365 account — giving an attacker access to all client tax correspondence for 11 days before detection. Mycelium 365 deployed Conditional Access with MFA, Defender for Office 365 with anti-phishing policies, and 24/7 SOC monitoring via Huntress. A full incident response plan was documented and tested. The firm now meets ATO data security requirements and has TPB compliance evidence on demand.
Why accounting firms choose Mycelium 365
- Microsoft Solutions Partner — verified at partner.microsoft.com — not self-declared expertise
- Fixed-price, month-to-month — from $95/user/month, no lock-in contracts, written proposals before any work begins
- Australian data residency — all Microsoft 365 data hosted in Microsoft's Sydney and Melbourne datacentres under Australian law