Rule 10B of the Income-tax Rules, 1962, provides the methodology for determining the arm's length price in international transactions or specified domestic transactions. It outlines various methods such as the Comparable Uncontrolled Price Method, Resale Price Method, Cost Plus Method, Profit Split Method, and Transactional Net Margin Method. Each method has specific criteria and applicability, ensuring that the transactions between associated enterprises are conducted as if they were between unrelated parties. This rule is significant as it helps prevent profit shifting and tax avoidance by ensuring fair pricing in cross-border transactions. The burden of proof lies with the taxpayer to justify the method chosen and the arm's length nature of the transaction. In practice, this rule is crucial for multinational companies operating in India, as it directly impacts their tax liabilities and compliance requirements.