In this context, our contribution allows not only to confront the usual WACC computation to a more progressive and less synthetic one, but also to help firms to adapt the WACC approach to any chosen tax shield valuation model. In this sense, the WACC appears as a powerful and very adaptable concept. Nevertheless, several firms' peculiarities as intermediated credit, bankruptcy costs, international financial engineering projects, etc., are still easier to value separately rather than through a WACC. Therefore, the generalization of this paper to such complex situations remains a challenging issue.