BIM45960 | Specific deductions: patents and royalties: costs of registering, or extending the life of, trade marks and designs

From HM Revenue & Customs · Business Income Manual

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Expenses incurred in obtaining the registration of a design or a trade mark for the purposes of the trade are allowable deductions. Costs of obtaining the extension of the period of a design right or the renewal of registration of a trade mark for the purposes of the trade are also allowable.