TPG2022 Chapter III paragraph 3.51

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It bears emphasis that comparability adjustments are only appropriate for differences that will have a material effect on the comparison. Some differences will invariably exist between the taxpayer’s controlled transactions and the third party comparables. A comparison may be appropriate despite an unadjusted difference, provided that the difference does not have a material effect on the reliability of the comparison. On the other hand, the need to perform numerous or substantial adjustments to key comparability factors may indicate that the third party transactions are in fact not sufficiently comparable.

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