A bank performs both exempt and taxed services. Costs have been incurred for both services (the so-called ‘general costs’). The bank wishes to determine the degree of VAT deduction on the basis of actual use by connecting to a business economic analysis of the ‘profit and loss’ per product. The mixed costs were then allocated to the different product and turnover categories on the basis of three allocation keys. The dispute is whether the distribution keys used by the bank to determine the degree of VAT deduction with regard to general costs are correct.