Article 4
1. The euro equivalent in national currency which shall apply for the implementation of this Directive shall be fixed once a year. The rates applicable shall be those obtaining on the first working day of October with effect from 1 January of the following year. 2. Member States may round off the amounts in national currency resulting from the conversion of the amounts in euros provided for in Article 1(2), provided such rounding-off does not exceed EUR 2. 3. Member States may maintain the amount of the exemption in force at the time of the annual adjustment provided for in paragraph 1 if, prior to the rounding-off provided for in paragraph 2, conversion of the amount of the exemption expressed in euros would result in a change of less than 5 % in the exemption expressed in national currency.