Internal vs external audit: when each is needed

A warehouse owner often faces a choice: give the audit job to one of their own people or bring in a specialist from outside. In practice it is not an either-or question. Each format solves the same problem from a different side, so knowing which is needed and when saves both money and time.

Internal audit: continuous and close to the process

An internal auditor is an employee of the company. They know the business, the goods and the people, so little time goes on explanations. They can visit the warehouse every week, oversee cycle counts and follow stock adjustment entries through the month. A problem is spotted as it appears, not at year-end. Reviewing stock adjustment entries at month-end, for instance, they may notice that one employee has "topped up" the same item several times.

The weak point is independence. The internal auditor is paid by the same manager as the people being checked, works alongside colleagues for years and goes "blind" to the familiar: a mess seen every day starts to look normal. It is also hard to write bluntly about a colleague's mistake.

External audit: independent and built for trust

An external auditor does not depend on the company, so a bank, partner, investor or new owner can rely on the conclusion. They have also seen several warehouses, which means they know what "normal" looks like and where the typical weak spots are. Relationships inside the company do not colour their view.

There are drawbacks. It takes time to learn the business, the service is usually one-off, and the fee looks higher than an internal auditor's salary. An external auditor is not in the warehouse every day, so cannot replace daily oversight.

When each one fits

Choose an external audit when:

• a storekeeper or manager is changing and stock must be handed over objectively;
• shortages keep recurring and internal checks cannot find the cause;
• the business is being sold, partners are changing, or asset values must be confirmed for a loan;
• clean balances are needed before moving to 1C or another system;
• the internal auditor has themselves become one of the people under review.

Choose an internal audit when:

• processes need constant monitoring, cycle counts and monthly variance reviews;
• you need to check that earlier recommendations are being carried out;
• you have many warehouses or branches and calling in an outside auditor for each would cost too much.

A mixed model: often the best answer

Many companies use a mixed model, combining both. An internal owner runs cycle counts and spot checks through the month. Once or twice a year an outside party independently reviews the whole process, assesses whether internal control works and points out what the internal auditor missed.

For example, take a warehouse with about 3,000 items. The internal team counts the 200 most valuable, fastest-moving items every month and keeps a variance summary in Excel. Before year-end an external auditor checks documents, access rights and the receiving and dispatch routine, and also judges how reliable the internal team's reports are. The manager ends up with both a daily and an independent picture.

What to weigh when choosing

Answer three questions. First, who will read the result: only you, or also a bank, a partner, a tax inspection? Second, how serious is the problem: if there are suspicions, you need an objective party. Third, how often do you need oversight: if monthly, you need an internal format. For most businesses the answer is "both, each in its place".

Both formats have typical mistakes. The internal auditor's role is handed to the warehouse manager or chief accountant as an extra duty, so they end up checking themselves. An external auditor is called only once the shortage has already grown, the data is in a mess and the work drags on. Finally, recommendations stay in the report: nobody tracks them, and the same findings reappear at the next review.

Conclusion

Internal audit is your own observer inside the warehouse; external audit is a view from the outside. OmborAudit works as an independent external party: a one-off review is possible, as is a periodic audit that complements an internal team.