TPG2022 Chapter II paragraph 2.15

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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 CUP 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 could materially affect the price in the open market; or, b) reasonably accurate adjustments can be made to eliminate the material effects of such differences. Where it is possible to locate comparable uncontrolled transactions, the CUP method is the most direct and reliable way to apply the arm’s length principle. Consequently, in such cases the CUP method is preferable over all other methods.