Introducing Article 22, section 9b, item 1 into the Personal Income Tax Act of 26 July 1991 using terms that have not been defined in this Act and not specifying the provisions of other acts of law which would become the grounds for defining these terms, thereby creating a normative condition for applying 50% tax-deductible expenses to income arising from activities performed by IT employees, the lawmakers failed to observe the requirement of correct legislation determined by the Constitutional Tribunal in its judgements, creating a law that is vague and imprecise, and gives the entities applying it a sense of uncertainty about whether they apply the provisions of the Personal Income Tax Act correctly.