TPG2022 Chapter II paragraph 2.47

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Following the principles in Chapter I, an uncontrolled transaction is comparable to a controlled transaction (i.e. it is a comparable uncontrolled transaction) for purposes of the cost plus method if one of two conditions is met: a) none of the differences (if any) between the transactions being compared or between the enterprises undertaking those transactions materially affect the cost plus mark up in the open market; or, b) reasonably accurate adjustments can be made to eliminate the material effects of such differences. In determining whether a transaction is a comparable uncontrolled transaction for the purposes of the cost plus method, the same principles apply as described in paragraphs 2.29-2.34 for the resale price method. Thus, fewer adjustments may be necessary to account for product differences under the cost plus method than the CUP method, and it may be appropriate to give more weight to other factors of comparability described in Chapter I, some of which may have a more significant effect on the cost plus mark-up than they do on price. As under the resale price method (see paragraph 2.34), where there are differences that materially affect the cost plus mark ups earned in the controlled and uncontrolled transactions (for example in the nature of the functions performed by the parties to the transactions), reasonably accurate adjustments should be made to account for such differences. The extent and reliability of those adjustments will affect the relative reliability of the analysis under the cost plus method in particular cases.