EN
In the following article the author presented issues concerning the active part of a taxpayer in jurisdictional appeal proceedings. The obligation of insuring a party the active part in the proceedings encumbers tax authority from the moment of its instigation until its completion. In other words the principle of an active part is of tremendous significance for the taxpayer, as it guarantees him participation in shaping the course of the whole tax proceedings including the resolution. All breaching of the abovementioned principle constitute a basis for turning down the decision in an appeal proceedings or a legal disability resulting in resumption of proceedings.