Internal Audit DIY Guide: How to Test Controls Without an External Consultant

Introduction

Internal audits do not have to feel intimidating.

Many organizations assume they need an external consultant every time they want to test controls, review evidence, or prepare for ISO 27001, SOC 2, or broader security governance.

Sometimes external support is helpful. But not every internal audit has to be outsourced.

With a clear method, practical scope, and honest evidence review, a compliance lead, security manager, operations lead, or internal cross-functional reviewer can run a useful DIY internal audit without overwhelming the team.

Why Internal Audits Matter

An internal audit is not just a compliance formality. It helps answer important questions:

• Are policies being followed?
• Are controls operating as described?
• Is evidence complete and current?
• Do owners understand their responsibilities?
• Are findings being corrected?
• Are risks being reviewed?
• Are review cycles happening on time?

When a DIY Internal Audit Makes Sense

A DIY internal audit works well when:

• your scope is manageable
• your team understands the process
• you have enough independence internally
• you want to test readiness before an external review
• you are reviewing common controls like access, vendors, incidents, policies, and corrective actions

It may not be enough when:

• the audit is highly complex
• independence is required by a specific certification body
• the organization has serious unresolved control failures
• leadership needs external validation
• the audit covers technical areas your team cannot assess objectively

The Big Rule: Test Evidence, Not Intentions

This is the most important part. Do not only ask, “Do we have a process?” Ask, “Can we prove this process worked?”

Step 1: Define a Small, Clear Scope

Do not audit everything at once. Start with the areas most likely to affect compliance and security maturity.

A practical DIY audit scope might include:

• access control
• vendor management
• incident response
• risk register
• corrective actions
• policy review
• backup testing
• security awareness training

Step 2: Build a Simple Audit Plan

Your audit plan does not need to be complicated. It should include the audit objective, scope, controls being tested, audit dates, people to interview, evidence to review, expected output, and reporting format.

Step 3: Choose Controls to Test

Select controls that matter most. Good starter controls include access control, vendor management, incident response, policy governance, and corrective actions.

Step 4: Use Sampling

You do not need to test every record. Use samples to keep the audit manageable.

For example:

• 5 new hires
• 5 terminated users
• 3 critical vendors
• 3 incidents or near misses
• 5 corrective actions
• 3 policies due for review
• 2 backup restore tests

Step 5: Ask Short, Practical Questions

Internal audit interviews do not need to be long. Ask control owners practical questions like:

• What process do you own?
• How does it work in practice?
• Where is the evidence stored?
• What happens when something is overdue?
• What exceptions exist?
• What usually breaks?
• What changed since the last review?

Step 6: Review the Evidence

For each sample, check whether evidence is complete, current, linked to the right control, approved where needed, dated, attributable to an owner, stored in the right place, and strong enough to support the claim.

Step 7: Rate Your Findings

Not every issue is equal. Use simple categories so leadership knows what needs attention first.

Step 8: Create Corrective Actions

Every meaningful finding should become an action. A good corrective action includes the issue, root cause, action required, owner, due date, evidence needed, and verification method.

Step 9: Prepare a Simple Audit Report

Your report should be clear and useful. Include the objective, scope, dates, controls tested, evidence reviewed, summary of results, findings, observations, corrective actions, and overall readiness view.

Leadership should be able to understand what was tested, what worked, what did not, and what needs to happen next.

Step 10: Follow Up

This is where many DIY audits fail. They complete the report, then forget the follow-up.

Schedule a follow-up review to confirm:

• actions were completed
• evidence was attached
• closure was verified
• repeated issues were escalated
• management review receives the results

A Practical DIY Internal Audit Checklist

Common Mistakes to Avoid

1. Auditing too much at once: Start focused.
2. Only reviewing documents: Test actual evidence and samples.
3. Letting owners audit their own controls without review: Try to maintain some independence.
4. Writing vague findings: Findings should be specific and actionable.
5. Ignoring root cause: Fix the process, not just the symptom.
6. Skipping follow-up: Corrective action closure is part of the value.

What to Store in SharePoint

If you use SharePoint, create a clean audit workspace with:

• audit plan
• evidence request list
• evidence links
• interview notes
• findings register
• corrective action tracker
• final report
• follow-up evidence

Canadian Cyber’s Take

At Canadian Cyber, we often see organizations delay internal audits because they assume the process must be formal, expensive, or consultant-led.

It does not always have to be.

A useful DIY internal audit can be simple, focused, and practical. The key is to test the right things:

• evidence quality
• ownership
• consistency
• follow-up
• control operation

Takeaway

The value of internal audit is not the report. It is the improvement that follows.

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