Certainty and clarity in the tax base.. mandatory determined by the central authorities of the law in terms of the tax increase and landmarks its container and collected and exemptions own schedule determines tax

You must be a tax or part of the required everyone to pay them, to be uncertain and not random, the fact that a mandatory tax determined by the central authorities of the law in which the tax parameters in terms of percentage identifies and its container and collected and exemptions their own schedules so as to be in charge of the familiar full legal by texts this does not come unless the legislative texts stable and fixed and not subject to switch and change without leaving it to the discretion of administrators.