This work analyzes the legal regulation of registering payers of the VAT, aiming to determine and solve problems, which arise for the payers of VAT when registering to become as such and for the State Tax Inspectorate when administering and controlling this process. Mostly the Lithuanian Republic Law on Value Added Tax and the EU Sixth Council Directive 77/388/EEC regulations are analyzed. By applying document analysis and other related methods, it was determined that registration as a VAT payer is actually the right of the persons, not the duty. However, the implementation of this right is burdened by ambiguous regulations in the law and its official commentary. Difficulties especially arise when identifying persons who could be registered as VAT payers. In addition, it was confirmed that many other aspects important to the registration as VAT payers, e.g. „economic activity“, „intention to do economic activity“, „random transaction“, lack definition, which may cause uncertainty for Lithuanian and foreign persons who are registering. Prevention of fraud, where the actions of registration as VAT payers control are aimed at, greatly depends on the freedom of actions granted to the State Tax Inspectorate by the legal acts. Therefore, the author draws attention to the risk, which is related to the choice of the proper methods of control and implementation without violating the interests of the state and the taxpayers. At the end of the thesis, together with conclusions, the... [to full text]