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When a business is small, the owner sees everything. As it grows — more staff, branches, suppliers and customers — that visibility fades, and losses through error and fraud quietly rise. Internal controls restore visibility without the owner having to approve every voucher.
The COSO view in one paragraph
The COSO Internal Control framework, used worldwide, has five components: the control environment (tone at the top), risk assessment, control activities, information and communication, and monitoring. In practice: decide what could go wrong, put sensible checks in place, make sure people know them, and verify they work.
Ten controls that prevent most losses
- An approvals matrix — who can approve purchases, payments, discounts and write-offs, and up to what amount.
- Segregation of duties — the person who records a payment should not approve it or reconcile the bank.
- Monthly bank reconciliations, reviewed and signed by someone other than the preparer.
- Vendor master controls — changes to supplier bank details verified independently before any payment.
- Inventory counts — regular cycle counts and a full year-end count, with differences investigated.
- Payroll checks — joiners and leavers approved by HR, and payroll changes reviewed each month.
- Cash handling — daily cash-up, deposits and surprise counts at branches.
- IT access rights — individual logins, least privilege and prompt removal of leavers' access.
- A disciplined month-end close with reconciled control accounts and management review.
- A whistle-blowing channel — most frauds are found through tips.
Signs you have outgrown your controls
- Stock or cash differences nobody can explain.
- Month-end takes weeks, or management accounts are not trusted.
- Key processes depend on one person who never takes leave.
- The auditor's management letter repeats the same points every year.
How to start
Begin with a short risk assessment of your main cycles — purchasing, sales, inventory, payroll and treasury. Fix the highest risks first, document simple procedures, and then test that they work. An outsourced internal audit can do this for you at a fraction of the cost of an in-house team.
Our corporate advisory practice carries out internal audit, risk and controls reviews, and our IT consulting practice reviews IT access and system controls.
This guide is general information based on the law as we understand it on the date shown, not advice for your situation. Tax rules change often — please speak to us before acting on it. See our disclaimer.