SolvedDT14807 | Double Taxation Relief Manual: Oman: relief from Omani tax
From HM Revenue & Customs · Double Taxation Relief Manual
No special forms are available in this country for the purpose of claiming relief from Omani tax under the terms of the Agreement.
Claimants should write to the Secretary General for Taxation, Ministry of Finance, PO Box 285, PC113 Muscat, Sultanate of Oman.
A residence certificate (see INTM162030) will be required in support of the claim.