TPG2022 Chapter II paragraph 2.52

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Another important aspect of comparability is accounting consistency. Where the accounting practices differ in the controlled transaction and the uncontrolled transaction, appropriate adjustments should be made to the data used to ensure that the same type of costs are used in each case to ensure consistency. The gross profit mark ups must be measured consistently between the associated enterprise and the independent enterprise. In addition, there may be differences across enterprises in the treatment of costs that affect gross profit mark ups that would need to be accounted for in order to achieve reliable comparability. In some cases it may be necessary to take into account certain operating expenses in order to achieve consistency and comparability; in these circumstances the cost plus method starts to approach a net rather than gross profit analysis. To the extent that the analysis takes into account operating expenses, its reliability may be adversely affected for the reasons set forth in paragraphs 2.702.73. Thus, the safeguards described in paragraphs 2.742.81 may be relevant in assessing the reliability of such analyses.