DT13502 | Double Taxation Relief Manual: Morocco: source of income
From HM Revenue & Customs · Double Taxation Relief Manual
For the purposes of the Elimination of double taxation Article, profits, income, and capital gains derived by a United Kingdom resident which can be taxed in Morocco under the provisions of the agreement are deemed to have a source in Morocco (Article 22(4)).
Interest and royalties are deemed to arise in the country in which the payer is resident (Articles 11(5) and 12(5)).