TPguidelines

The arm’s length result of a controlled transaction must be determined under the method that, under the facts and circumstances, provides the most reliable measure of an arm’s length result. Thus, there is no strict priority of methods, and no method will invariably be considered to be more reliable than others. An arm’s length result may be determined under any method without establishing the inapplicability of another method, but if another method subsequently is shown to produce a more reliable measure of an arm’s length result, such other method must be used. Similarly, if two or more applications of a single method provide inconsistent results, the arm’s length result must be determined under the application that, under the facts and circumstances, provides the most reliable measure of an arm’s length result. See § 1.482-8 for examples of the application of the best method rule. See § 1.482-7 for the applicable methods in the case of a cost sharing arrangement.