Abstract
The article deals with the institute of interest in tax administration, its types, amount and method of imposition under the Tax Code (Act No. 280/2009 Coll.), as amended, in a broader context. The aim of the article is to answer the question whether the institute of interest has changed, or in what way, as well as to confirm or refute the hypothesis that the institute of interest is a traditional instrument in tax administration, that it is sufficiently regulated by legislation, and that the incentive function of tax can be found in this institute.