In some cases, a significant issue for the reliability of cost-based splitting factors is the determination of the relevant period of time from which the elements of determination of the profit splitting factor(s) (e.g. assets, costs, or others) should be taken into account. A difficulty arises because there can be a lag between the time when expenses are incurred and the time when value is created, and it is sometimes difficult to decide which period’s expenses should be used. For example, in the case of a cost-based factor, using the expenditure on a single-year basis may be suitable for some cases, while in some other cases it may be more suitable to use accumulated expenditure (net of depreciation or amortisation, where appropriate in the circumstances) incurred in the previous as well as the current years. Depending on the facts and circumstances of the case, this determination may have a significant effect on the allocation of profits amongst the parties. As noted in Section C.5.1 above, the selection of the profit splitting factor should be appropriate to the particular circumstances of the case and provide a reliable approximation of the division of profits that would have been agreed between independent parties. The principles of this section are illustrated by Example 16 in Annex II to Chapter II of this guidance ...

A profit splitting factor based on expenses may be appropriate where it is possible to identify a strong correlation between relative expenses incurred and relative value contributed. For example, marketing expenses may be an appropriate factor for distributors-marketers if advertising generates unique and valuable marketing intangibles, e.g. in consumer goods where the value of marketing intangibles is affected by advertising. Research and development expenses may be suitable for manufacturers if they relate to the development of unique and valuable intangibles such as patents. However, if, for instance, each party contributes different valuable intangibles, then it is not appropriate to use a costbased factor unless cost is a reliable measure of the relative value of those intangibles or costs can be risk-weighted to achieve a reliable measure of relative value. Even where each party contributes the same kind of intangibles, risk-weighting will be an appropriate consideration. For example, where the risk of failure at an early stage of development is several times higher than the risk of failure at a later stage or in the development of incremental improvements to an already proven concept, then the costs incurred in that early stage will have a higher risk weighting than the costs incurred at a later stage or on incremental improvements. Employee remuneration may be relevant in situations where functions relating to the skills and experience of staff are the primary factor in generating the relevant profits ...