Judgment of the Court (First Chamber) of 20 May 2021.#„ALTI“ OOD v Direktor na Direktsia „Obzhalvane i danachno-osiguritelna praktika“ Plovdiv pri Tsentralno upravlenie na Natsionalnata agentsia za prihodite.#Request for a preliminary ruling from the Varhoven administrativen sad.#Reference for a preliminary ruling – Taxation – Common system of value added tax (VAT) – Directive 2006/112/EC – Article 205 – Persons liable for payment of VAT to the public exchequer – Joint and several liability of the recipient of a taxable supply which has exercised its right to deduct VAT knowing that the person liable for payment of that tax would not pay it – Obligation of such a recipient to pay the VAT not paid by the person liable for payment and the default interest due on account of that person’s failure to pay the VAT.#Case C-4/20.