One of the features of the tax regime which applies to oil and energy products is the fact that, in relation to motor fuels, the amounts of the special duty - known as "ISP" - are set by a ministerial order issued by the members of government responsible for finance and the economy, at the intervals stipulated by the Parliament and set down in Article 92 of the Special Excise Duties Code (IEC Code) enacted by Decree-Law 73/2010, of 21 June.