Tax authorities audit transfer pricing arrangements by examining whether transactions between related entities are conducted at arm’s length. The audit typically begins with a risk assessment, using tax returns, financial statements, country-by-country reports, and comparables data to identify potential profit shifting. Authorities then request transfer pricing documentation, including local and master files, to review pricing methods, functional analyses, and economic justifications. Auditors compare related-party prices to market benchmarks, assess profit allocation, and scrutinize intangibles, services, and intercompany financing. Interviews with management may follow. If inconsistencies are found, authorities can propose adjustments, impose penalties, or initiate mutual agreement procedures to resolve double taxation.