Internal comparables under the transactional net margin method...

Internal comparables under the transactional net margin method should generally be preferred to external comparables where audited segmental accounts reliably distinguish associated-enterprise and non-associated-enterprise transactions. Segmental financials extracted from audited accounts may support arm's length price determination where a chartered accountant certifies both their mathematical accuracy and allocation on a generally accepted rational basis. A claim that segmental data were not maintained is unsustainable when the relevant segmental figures are demonstrably derived from audited accounts.