This thesis is analyzing revenue dynamics of Lithuanian Republic budget of 2000 – 2006 years with direct aspect of taxes and the reasons which influed changes. In the beginning of thesis there was hypothesis, that incomes to national budget of population revenue taxes is the biggest part of budget revenue. The experiment was based on needs to value results of population revenue taxes decrease for budget. Objective conclusions about budget revenue, influed by 2006 years reform, can be done only by the end of this year. In despite of, this thesis is analyzing changes of budget already first months after reform. Also is analyzing other direct taxes structural parts in Lithuanian Republic national budget, taxes specification in countries of EU and the principles of processes of EU taxes harmonization, which are important for Lithuania in EU economic area.