http://www.legislation.gov.uk/ukpga/2005/5/section/51/2014-07-18Income Tax (Trading and Other Income) Act 2005An Act to restate, with minor changes, certain enactments relating to income tax on trading income, property income, savings and investment income and certain other income; and for connected purposes.texttext/xmlenStatute Law Database2024-05-30Expert Participation2014-07-18Part 2Trading incomeChapter 4Trade profits: rules restricting deductionsPatent royalties51Patent royaltiesF1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .