TPG2022 Chapter II paragraph 2.17

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In considering whether controlled and uncontrolled transactions are comparable, regard should be had to the effect on price of broader business functions other than just product comparability (i.e. factors relevant to determining comparability under Chapter I). Where differences exist between the controlled and uncontrolled transactions or between the enterprises undertaking those transactions, it may be difficult to determine reasonably accurate adjustments to eliminate the effect on price. The difficulties that arise in attempting to make reasonably accurate adjustments should not routinely preclude the possible application of the CUP method. Practical considerations dictate a more flexible approach to enable the CUP method to be used and to be supplemented as necessary by other appropriate methods, all of which should be evaluated according to their relative accuracy. Every effort should be made to adjust the data so that it may be used appropriately in a CUP method. As for any method, the relative reliability of the CUP method is affected by the degree of accuracy with which adjustments can be made to achieve comparability.

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