The Trade Competition Commission has issued a binding rule: large retail and wholesale firms (revenue of 500 million baht or more) must pay SME suppliers within 45 days, or 30 days for agricultural goods such as vegetables, fruit, chicken and eggs. Payment is counted from delivery, quality check and billing. It takes effect 3 November. Fines can reach 10% of revenue. If you supply a big retailer, check your payment terms now, keep delivery and billing proof, and file a complaint with evidence if payments run long. Anonymous complaints are allowed. Construction, steel and auto-parts supply chains may be next.