Does Your Growing Company Need Internal Audit? Signs, Benefits, and How to Start
By Kevin Black, CPA, CIA, CISA | EC Barrett | October 2026
Most growing companies reach a point where the owner or CFO can no longer see every process firsthand. That is usually the moment internal audit starts paying for itself.
In the early years, oversight is personal. Leadership approves the big payments, knows every customer, and can spot a problem by walking the floor. As the company adds locations, systems, employees, and lenders, that informal oversight stops scaling. Problems surface later, cost more to fix, and often show up first as an audit adjustment or a surprised lender.
Internal audit gives leadership an independent, structured look at how the business is really running. And for most private companies, it does not require hiring a full department.
Seven signs it's time
No single revenue figure triggers the need. These signs matter more than size:
1. Your external auditors keep finding things. Recurring audit adjustments, a growing management letter, or a control deficiency that comes back year after year all point to process gaps that internal audit can trace to the root cause.
2. Month-end close keeps getting longer. A slow, error-prone close usually means reconciliations, reviews, or handoffs are breaking down somewhere.
3. A few people hold all the knowledge. When one controller or office manager is the only person who understands a process, you have both a continuity risk and a fraud risk.
4. Lenders, investors, or a board are asking harder questions. New covenants, a private equity investor, or an outside board often bring expectations for formal risk oversight.
5. You are acquiring, merging, or expanding. New entities and locations bring new processes, systems, and cultures that need to be brought under consistent controls.
6. You just implemented, or are about to implement, a new system. ERP and accounting system changes are a common source of control breakdowns, access problems, and data errors.
7. You have had a scare. A fraud, a near miss, a cyber incident, or a compliance issue is often the clearest signal that oversight has not kept pace.
What internal audit actually does
Internal audit is not a second external audit, and it is not just about catching mistakes. A well-run function covers three areas:
• Controls and risk. Testing whether key controls over cash, payroll, purchasing, revenue, and financial reporting work as designed, and flagging gaps before they become losses or audit findings.
• Operations. Finding inefficiencies, such as duplicate payments, manual workarounds, and approval bottlenecks, that quietly erode margins.
• Compliance. Confirming the company meets its lender covenants, contracts, and regulatory requirements.
The best internal audit work leaves processes better than it found them. Recommendations should be practical, sized to the company, and agreed with the managers who will carry them out. Done well, internal audit becomes a resource managers call on, not a function they avoid.
You don't need a department to start
Most private companies start with an outside provider rather than full-time hires. The right model depends on whether you have anyone in-house today.
Model | How it works | Best fit |
Outsourced | An outside firm runs the whole function: risk assessment, audit plan, fieldwork, and reporting to leadership or the board. | Companies with no internal audit staff that want results without adding headcount. |
Co-sourced | Your internal team leads, and an outside firm adds specialists or capacity for specific audits. | Companies with one or two internal auditors who need extra hands or specific expertise, such as IT or fraud. |
In-house | Full-time employees run the function. | Larger organizations with steady, year-round audit needs. |
An outside provider also brings what an internal hire cannot easily offer on day one: an independent view, and lessons learned at other companies in your industry.
How to get started
A practical first year looks like this:
1. Get the owner or CEO behind it. Internal audit only works when leadership backs it publicly and makes clear it is there to help, not to police.
2. Set the reporting line. Internal audit should report to the board, an audit committee, or the owner, not to the people whose areas it reviews.
3. Run a risk assessment. Interview key managers and review financial data to rank where the biggest risks and inefficiencies sit.
4. Build a short audit plan. Pick two to four high-value areas for year one. Cash disbursements, payroll, and system access are common starting points.
5. Report findings with solutions. Each report should name the issue, why it matters in dollars or risk, and a practical fix that management agrees to.
6. Follow up. Track whether agreed fixes were made. A finding that is never closed has no value.
Expect some early resistance. Managers may see internal audit as extra work or as someone looking over their shoulder. The fastest way past that is an early win: a first audit that saves money or removes a headache shows the function's value better than any memo.
About the author
Kevin Black, CPA, CIA, CISA, leads the internal audit practice at EC Barrett, an Atlanta-based, PCAOB-registered CPA firm. Kevin has more than 11 years of experience in audit and risk advisory, including:
• Internal audit, internal control testing, and SOX support
• IT audit and IT general controls
• Financial statement audits for public and private companies
Contact: kevin.black@ecbllc.com | 404-250-4570
If your organization is weighing internal audit, I'm happy to talk through whether it fits and where to start.
Disclaimer: This blog is for informational purposes only and does not constitute legal or audit advice. Please consult with a qualified professional for personalized guidance.