A former employee can retain access to a shared mailbox, cloud folder or finance platform long after their last working day. A contractor may still have administrator rights because a temporary task became permanent in practice. These are common operational gaps, and they are precisely why businesses need to know how to audit user access in a structured, repeatable way.
An access audit is more than a security checklist. Done well, it protects critical business data, reduces operational disruption and gives decision-makers confidence that people can reach the systems they need without holding unnecessary privileges. For organisations using Microsoft 365, cloud applications and a mix of managed devices, it is a practical part of proactive IT management.
What a user access audit should establish
A user access audit compares who currently has access to systems and data with who should have access according to their role, employment status and business need. It should identify active accounts, privileged accounts, shared accounts, inactive users, external guests and access granted through groups or application roles.
The aim is not to remove access aggressively. Overly broad removals can interrupt payroll, customer service, project delivery or recovery procedures. Instead, the audit should establish clear ownership and a defensible reason for each level of access.
For a small business, this may begin with Microsoft 365, accounting software, file storage and remote access tools. A larger or more distributed organisation may also need to assess customer relationship management platforms, line-of-business applications, cloud infrastructure, source code repositories, backup consoles and third-party supplier portals.
Start with a complete inventory of identities and systems
You cannot audit access reliably if you do not know where identities exist. Begin by creating a system register that lists every business application, platform and administrative portal that stores company, employee or customer data. Include both approved services and tools that teams may have adopted independently.
For each system, record the system owner, technical administrator, type of data held, authentication method and the location of user access records. This makes the work manageable and exposes a common problem: applications with no nominated owner.
Next, collect identity data from your central directory, such as Microsoft Entra ID for Microsoft 365 environments, alongside user lists from standalone applications. Capture the user’s name, business email address, department, manager, employment type, account status, last sign-in and assigned roles or groups.
Pay close attention to accounts that do not map neatly to a person. These include service accounts used by applications, emergency administrator accounts, shared mailboxes, generic accounts used on shop floors or in reception areas, and accounts belonging to external suppliers. They may be legitimate, but each requires a documented purpose, owner and review process.
Define what appropriate access looks like
Access reviews become inconsistent when reviewers are asked only whether a person “needs access”. Set a practical access model before sending any review requests. The principle of least privilege is useful here: users should receive the minimum access needed to perform their approved responsibilities.
Role-based access control, often called RBAC, is the most sustainable approach. Rather than assigning permissions one user at a time, create access groups for defined job functions such as finance officer, sales manager, helpdesk analyst or project contractor. Assign access to the group, then add eligible users to it. This reduces administrative effort and makes future audits easier to interpret.
However, job titles alone are not always enough. A finance manager may need approval rights in one system but not full administrative control. An IT support provider may need time-limited access to troubleshoot an issue but should not retain it indefinitely. Your model should allow exceptions, but every exception should have an approver, a business justification and an expiry date where possible.
Prioritise privileged access first
Administrator accounts deserve the earliest and most detailed review because they can change configurations, create users, access sensitive content or disable security controls. Check global administrators, billing administrators, security administrators, cloud subscription owners, backup administrators and application super-users.
Where possible, separate standard and administrative accounts. An employee should use their standard account for email and daily work, then use a separate privileged account only for approved administrative tasks. Enforce multi-factor authentication (MFA) for privileged accounts and avoid relying on a single administrator account. This supports business continuity if one person is unavailable.
How to audit user access step by step
A practical audit works best in stages rather than as a single annual exercise. The following process can be adapted to your organisation’s size, systems and compliance obligations.
- Set the scope and review date. Decide which systems, data sets and user types are included. Begin with high-risk systems containing financial, customer, employee or operational data.
- Export current access data. Obtain user, group, role and guest-access reports from each platform. Keep the export date and source, as access can change during the review.
- Normalise the information. Match accounts to a reliable staff list from HR or management. Look for duplicate accounts, misspelt names, personal email addresses and accounts without a manager.
- Ask system owners and managers to attest access. Provide clear choices: retain, modify or remove. Require a short reason for high-privilege access and do not treat non-response as approval.
- Remediate and document decisions. Remove unnecessary access, disable accounts for departed users, reduce privileges and record who approved each action. Test important changes where access affects critical workflows.
- Review the control gaps. Identify why inappropriate access existed. The issue may be an incomplete offboarding process, informal sharing of accounts, poor group design or a lack of ownership for an application.
The audit is not complete when the spreadsheet is signed off. Confirm that the agreed changes were applied, then retain evidence of the review. This evidence is useful for governance, internal assurance and any regulatory or customer due diligence requirements that apply to your business.
Look for the access risks that reports can hide
A clean user list does not necessarily mean access is appropriate. Many risks sit in indirect permissions and overlooked collaboration features.
In Microsoft 365, for example, access may come from a Microsoft 365 group, security group, Teams membership, SharePoint site permissions, mailbox delegation or an external sharing link. A user removed from one group may still reach the same information through another path. Review sensitive SharePoint sites and Teams separately, particularly where confidential documents are shared with guests.
External users need similar scrutiny. Check whether guest accounts are still active, who sponsored them and whether their access has a defined end date. For ongoing partners, use named guest identities rather than shared credentials so activity remains attributable.
Also investigate dormant accounts. An account that has not signed in for a defined period may belong to a former employee, a duplicate identity or a service that requires special handling. Do not automatically delete it before confirming its function. Disabling the account first, monitoring for impact and following a documented change process can reduce the risk of unintended disruption.
Build access reviews into everyday operations
The strongest access controls are connected to staff lifecycle processes. When a person joins, changes role or leaves, access should be provisioned, amended or revoked through a documented workflow. HR, line managers and IT all have a role, but accountability must be clear.
Offboarding should be prompt and consistent. Disable sign-in access, revoke active sessions, remove group memberships, transfer ownership of business files and mailboxes where required, and review access to non-centralised systems. For high-risk departures, act before or at the time employment ends, in line with your organisation’s policies and legal obligations.
Review frequency depends on risk. Privileged access and sensitive systems may warrant monthly or quarterly review. Standard access to lower-risk platforms may be reviewed every six or 12 months. Fast-growing businesses, organisations with frequent contractors or those handling sensitive information may need more frequent checks.
Automation can help, especially when integrated with identity platforms and HR records. Automated joiner, mover and leaver workflows reduce manual errors, while conditional access policies can restrict sign-ins based on risk, device compliance or location. Automation still needs governance: poorly designed rules can replicate incorrect access at scale.
Measure the value of the audit
Track a small number of meaningful indicators after each review. These might include the number of inactive accounts disabled, privileged accounts reduced, guest users removed, applications with named owners and offboarding actions completed on time. The goal is not to chase a low number for its own sake. It is to show whether access management is becoming more accurate, accountable and efficient.
A well-run access audit strengthens your security posture without making technology harder to use. It creates a clearer picture of who can access what, gives managers ownership of business decisions and helps protect critical business data as your systems and workforce change. Treat it as an ongoing management discipline, and it will help build a resilient technology environment rather than becoming another annual administrative task.
