I. – The tax provided for in article 300 bis is based on the difference between the following amounts, assessed exclusive of value added tax during the calendar year in which the tax becomes due, insofar as the amounts in question relate to the provision of the matchmaking service mentioned in the same article 300 bis, to the transactions mentioned in 1° of the said article 300 bis or to the elements that form part of the same economic transaction within the meaning of I and II of article 257 ter:
1° The sum of the amounts collected by the taxpayer during the calendar year;
2° The sum of the amounts paid by the taxpayer, during the same calendar year, to the users of the matchmaking service.
II. – The amount of the tax is calculated by applying to the base defined in I of this article a rate determined each year by a joint order of the ministers responsible for the budget, transport and labour. This rate may not exceed 0.5%.