Following the issuing of Oman Sultani Decree No. 118/2020 amending Oman Sultani Decree No. 28/2009, the Sultanate’s Tax Authority has announced the dual tax return system has been abolished. It means taxpayers only have to file one tax return within four months of the end of the relevant tax year from the 1 January 2020. Previously, taxpayers had to file a provisional return of income within three months and an annual return of income within six months from the end of the accounting year. Despite the change being welcomed, tax professionals have advised taxpayers to be aware audits of financial statements will need to be carried out well in advance of the tax return filing deadline. Oman Sultani Decree No. 118/2020 was published in the Official Gazette on 20 September 2020. It also includes provisions to facilitate the Automatic Exchange of Information (AEOI) between tax jurisdictions, the introduction of tax residency provisions and changes in the proceedings for appeals.