TPG2017 Chapter III paragraph 3.28

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On the other hand, internal comparables are not always more reliable and it is not the case that any transaction between a taxpayer and an independent party can be regarded as a reliable comparable for controlled transactions carried on by the same taxpayer. Internal comparables where they exist must satisfy the five comparability factors in the same way as external comparables, see paragraphs 1.33-1.118. Guidance on comparability adjustments also applies to internal comparables, see paragraphs 3.47-3.54. Assume for instance that a taxpayer manufactures a particular product, sells a significant volume thereof to its foreign associated retailer and a marginal volume of the same product to an independent party. In such a case, the difference in volumes is likely to materially affect the comparability of the two transactions. If it is not possible to make a reasonably accurate adjustment to eliminate the effects of such difference, the transaction between the taxpayer and its independent customer is unlikely to be a reliable comparable.

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