How do I register a Lithuanian company for VAT?

Through the Mano VMI portal, at least three working days before the date you want the registration to start. If the application lacks details, the tax inspectorate checks the information itself, which can take longer. The registration decision is posted in Mano VMI and applies from the date it states.

Source: Kaip įsiregistruoti PVM mokėtoju?, State Tax Inspectorate (VMI)