Audit preparation should not be a last-minute scramble. The organizations that pass audits consistently are the ones that prepare systematically. This checklist gives you the timeline and tasks to make audit season predictable instead of painful.

The 90-Day Audit Preparation Timeline

90 Days Before

Foundation

Confirm audit dates and scope with your auditor

Review previous audit findings and verify all remediation is complete

Update your asset inventory and data flow diagrams

Verify all policies have been reviewed within the last 12 months

Confirm risk assessment is current and documented

Review and update your control matrix or control descriptions

Identify all personnel who will interact with auditors

Begin collecting any evidence that requires long lead times

60 Days Before

Evidence Collection

Start systematic evidence collection for all in-scope controls

Verify access reviews have been conducted and documented

Confirm vulnerability scans are up to date (quarterly for PCI-DSS)

Ensure penetration test report is current (annual requirement)

Collect training completion records for all personnel

Gather change management records covering the audit period

Document incident response activities (or lack thereof) during the period

Verify vendor assessments and BAAs are current

Collect system configuration evidence (screenshots, exports)

Ensure all evidence is properly dated and attributed

30 Days Before

Quality Review

Conduct internal evidence review against all control requirements

Identify and fill any evidence gaps discovered during review

Perform a mock audit walkthrough with key personnel

Verify evidence covers the entire audit period (not just current state)

Review evidence naming conventions and organization for clarity

Confirm all system-generated reports are from authoritative sources

Test that all evidence repositories are accessible and organized

Prepare answers for common auditor questions in each control area

14 Days Before

Team Preparation

Brief all interview participants on what to expect and how to respond

Assign a single point of contact for auditor evidence requests

Prepare a shared workspace or portal for evidence delivery

Schedule rooms and resources for auditor on-site visits (if applicable)

Ensure all relevant personnel have cleared their calendars for audit days

Distribute the audit scope and timeline to all participants

Review and finalize any remediation items from self-assessment

Day Of

Execution

Welcome auditors and provide orientation (access, contacts, logistics)

Have evidence packages organized and ready for each control area

Ensure the audit coordinator is available throughout the engagement

Respond to evidence requests promptly -- delays extend timelines

Take notes on all auditor questions and observations

Escalate any issues or unexpected requests to management immediately

Maintain professional composure -- auditors are evaluators, not adversaries

Audit Day Tips

Be Honest

If you do not know the answer, say so and commit to following up. Guessing or misleading auditors creates bigger problems.

Stay Organized

Have evidence indexed and ready. Auditors appreciate well-organized evidence packages that show you take compliance seriously.

Answer What Was Asked

Provide the evidence requested. Volunteering extra information can open new areas of inquiry that extend the audit.

Document Everything

Take notes on every auditor request and question. This helps you prepare for future audits and track any follow-up items.

Common Preparation Mistakes

Starting preparation too late

90 days is the minimum. Organizations that start 30 days out consistently have worse outcomes.

Not assigning a dedicated audit coordinator

Someone must own the audit process end-to-end. Distributed ownership leads to dropped balls.

Preparing only current-state evidence

Audits (especially SOC 2 Type II) cover a period. Evidence must span the entire review period.

Not briefing interview participants

Unprepared employees can inadvertently disclose issues or give inconsistent answers.

Key Takeaways

Start preparation 90 days before the audit -- minimum

Systematic evidence collection eliminates the last-minute scramble

Quality review at 30 days catches gaps while there is time to fix them

Team preparation is as important as evidence preparation

On audit day, be honest, organized, and responsive

Post-audit, document lessons learned for next year

Audit Preparation Checklist