SolvedDT15902 | Double Taxation Relief Manual: Qatar: services
From HM Revenue & Customs · Double Taxation Relief Manual
Under paragraph 4 of Article 5 of the agreement, Qatar can tax UK residents who provide services in Qatar if the UK resident is an individual who is present in Qatar for more than 183 days or if the services relate to a project (including any connected project) that lasts for more than 183 days.