Hong Kong operates three separate capital-deduction mechanisms under profits tax: the enhanced deduction for research and development under section 16B and Schedule 45 (300% on the first HK$2,000,000 and 200% above it), the deduction for capital expenditure on acquiring intellectual property rights under sections 16E and 16EA (100% in one year for patent rights and know-how, five equal instalments over five years for six named rights), and the deduction for environmental facilities under section 16I (100% in the year the expenditure is incurred). These are three distinct regimes with different conditions, different prohibitions and different clawback rules on disposal.