Article 308
The taxable amount and the price exclusive of VAT, within the meaning of point (8) of Article 226, in respect of the single service provided by the travel agent shall be the travel agent's margin, that is to say, the difference between the total amount, exclusive of VAT, to be paid by the traveller and the actual cost to the travel agent of supplies of goods or services provided by other taxable persons, where those transactions are for the direct benefit of the traveller.