If a taxable dealer exercises the option under Article 316, the taxable amount shall be determined in accordance with Article 315.

In respect of the supply of works of art, collectors' items or antiques which the taxable dealer has imported himself, the purchase price to be taken into account in calculating the profit margin shall be equal to the taxable amount on importation, determined in accordance with Articles 85 to 89, plus the VAT due or paid on importation.