"How often should we audit Microsoft 365?" sounds like a compliance question with a tidy answer. It is not. The right cadence depends on how fast your tenant changes — and for almost every organization, the honest answer is "more often than once a year."
Here is a practical way to decide.
Why annual is not enough
An annual audit verifies the tenant on one day out of 365. Everything that happens in the other 364 days is a blind spot:
- A Conditional Access policy gets disabled during an incident and never re-enabled.
- A new app is consented to with broad permissions.
- A guest is invited for a project and left in the directory.
- External sharing is loosened for a deadline and never tightened.
None of these need to be malicious. They are just the normal churn of a live tenant. A yearly review cannot see them, and by the time the next audit comes around, the configuration is a different thing entirely.
There is also the evidence problem: auditors and clients increasingly ask about the period, not the day. A single annual report does not evidence monitoring across a year.
What determines your cadence
Three factors should drive the interval:
1. Rate of change. A tenant with active projects, frequent admin turnover, or a Copilot rollout changes fast and needs frequent audits. A small, static tenant changes slowly.
2. Compliance obligations. If you are measured against a framework that expects continuous monitoring, annual will not satisfy it. CISA's BOD 25-01, for example, directs agencies to monitor implemented baselines continuously.
3. Blast radius. The more sensitive the data and the more external collaboration, the shorter the interval should be.
A practical starting cadence
- Monthly — identity-heavy or fast-changing tenants, or anyone under active migration or Copilot rollout. Identity drift is the fastest-moving risk.
- Quarterly — a solid default for most organizations. It matches the rhythm many frameworks and insurers expect, and it is frequent enough to catch meaningful drift.
- Annually — only as a minimum for a small, static tenant with low external collaboration, and ideally paired with event-driven audits.
On top of the schedule, add event-driven audits when something material changes: a major migration, an admin change, a big external-sharing decision, a Copilot rollout, or any time a policy is touched under pressure.
Make the cadence realistic
The most common failure mode is a cadence that is technically correct and practically abandoned. Running PowerShell by hand every month is a chore; chores stop.
What makes a cadence stick:
- Low effort per run. A read-only audit you trigger, not a project you schedule.
- A consistent report. Same format every time, so you can compare the series.
- Somewhere to keep them. A history of dated reports is the actual asset — it shows what changed and when.
That is what scheduled audits are for: connect a tenant once, run on a cadence, keep every report. See pricing for how credits work, and the sample report for the output.
The short version
Annual audits miss most of the year. Pick a cadence that matches how fast your tenant changes — monthly for fast-moving or identity-heavy environments, quarterly as a default — and add an audit whenever something material changes. Keep the reports; the history is the evidence.
Run an audit now, then schedule the next one.