Without prejudice to the taxation of interest unduly exempted under 7° of Article 157, natural persons who have knowingly opened a Livret A in contravention of the provisions of the third paragraph of Article L. 221-3 of the Monetary and Financial Code are liable to a tax fine equal to 2% of the outstanding balance of the supernumerary passbook account.The fine is not recovered if its amount is less than €50.