Amortisation of patent and copyright acquisition costs allowed annually, with sale, termination and transfer adjustments applicable. Capital expenditure on acquisition of patent rights or copyrights used in business is deductible by annual amortisation using an appropriate fraction (one over the number of relevant previous years), typically spread over fourteen years from the year of expenditure (or business commencement where applicable), with adjustments where rights are sold, end, or are transferred in amalgamation or demerger, including rules that limit deductions or treat excess sale proceeds as business income.