It depends on the qualification date and user category. Under Constitutional Court Ruling C-384 of 2023 (conditional exequibility under legitimate expectations), industrial users qualified prior to December 13, 2022 retain the flat 20% income tax rate throughout their approved qualification period, without indefinite permanence via renewal terms absent ruling support. For newly qualified industrial users, the mixed formula of Art. 240-1 applies: 20% on income proportional to exports, and the general 35% rate on domestic TAN sales. Certain activities (offshore, ports, biofuels, logistics, and operators) retain a flat 20% rate. Commercial users are strictly taxed at the general 35% rate.