Article 81
Member States which, at 1 January 1993, were not availing themselves of the option under Article 98 of applying a reduced rate may, if they avail themselves of the option under Article 89, provide that in respect of the supply of works of art, as referred to in Article 103(2), the taxable amount is to be equal to a fraction of the amount determined in accordance with Articles 73, 74, 76, 78 and 79. The fraction referred to in the first paragraph shall be determined in such a way that the VAT thus due is equal to at least 5 % of the amount determined in accordance with Articles 73, 74, 76, 78 and 79.