Strengthening Internal Controls in a Growing Business
As a business grows, the owner can no longer see every payment, invoice and stock movement personally. Internal controls are the simple, repeatable checks that keep money and records safe, reduce errors and make financial information reliable enough to base decisions on.
A framework you can use: the five components
The COSO Internal Control – Integrated Framework (2013), which Thailand’s SEC also uses as the basis of its internal control assessment form, describes internal control in five components:
Control environment: the tone set by owners and management, clear responsibilities and a commitment to honest reporting.
Risk assessment: identifying what could go wrong, such as errors, fraud or missed deadlines, and how serious it would be.
Control activities: the actual checks, such as approvals, reconciliations and separation of duties.
Information and communication: making sure the right people receive accurate information on time.
Monitoring activities: reviewing whether controls work in practice and fixing gaps.
You do not need a large compliance team to apply these ideas. Small, consistent steps are usually enough for an SME.
Practical controls for SMEs
Cash and payments
Require a second approval for payments above an agreed amount.
Separate the person who records payments from the person who approves them where possible.
Reconcile every bank account monthly and have the reconciliation reviewed.
Sales and receivables
Issue invoices from a numbered sequence and investigate gaps.
Review aged receivables monthly and follow up overdue balances.
Approve credit notes and discounts before they are issued.
Purchases and expenses
Use purchase orders or written approval for significant purchases.
Match supplier invoices to orders and delivery records before payment.
Keep valid tax invoices and receipts for every claim.
Inventory and assets
Count stock regularly and investigate differences.
Keep a fixed asset register and check that assets still exist.
Systems and access
Give each user their own login to the accounting system, with access limited to their role.
Back up financial data and review who can change master data such as supplier bank details.
Example (illustrative only, not a client case): a distributor finds that one employee both sets up new suppliers and releases payments. Splitting these two tasks between two people, and reviewing changes to supplier bank details each month, closes a common route for payment fraud at very little cost.
Efficiency, not bureaucracy
Good controls should make work smoother, not slower. Focus first on the areas with the most money or the highest risk, automate checks where your accounting software allows, and review controls once a year as the business changes.
How YP can help
Our team can review your current processes, identify the most important gaps and recommend practical improvements. If your company is audited, strong controls also make the statutory audit smoother. Reliable monthly records from our Accounting & Tax Compliance service support effective monitoring. Book a consultation to discuss your processes.
Related reading: How to Prepare Your Business for an External Audit in Thailand and Tax Planning for Growing Companies in Thailand.
Sources
Information checked on 26 October 2026. This article is general information, not professional advice for your specific situation.
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