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GCC Tax & Policy Calendar
Future-dated tax implementation milestones, official compliance deadlines and announced policy targets—separated by legal status so a proposal is never presented as enacted law.
Only reviewed future milestones appear in the results. You can select any GCC jurisdiction; an empty result does not mean that no change will occur. Dates are never inferred from rumours, market commentary or unpublished expectations.
| Date | Jurisdiction | Topic | Status | Milestone | Who it affects | Source |
|---|---|---|---|---|---|---|
| 2027-04-01Effective date | Oman | E-invoicing | Effective date set | Electronic invoicing mandatory above OMR 5 million Decision 189/2026 mandatory commencement; distinguish the FAQ pilot timetable. | Taxable persons whose annual supplies exceed OMR 5 million. | Oman Official Gazette, issue 1660 Oman Official Gazette, issue 1660 · Tax Authority Decision No. 189/2026 (reproduced by Qanoon) |
| 2027-10-01Effective date | Oman | E-invoicing | Effective date set | Electronic invoicing mandatory at or below OMR 5 million Decision 189/2026 mandatory commencement; distinguish the FAQ pilot timetable. | Taxable persons whose annual supplies do not exceed OMR 5 million. | Oman Official Gazette, issue 1660 Oman Official Gazette, issue 1660 · Tax Authority Decision No. 189/2026 (reproduced by Qanoon) |
Calendar methodology
Dates with legal context, not just dates
Public sources only.
Entries are tied to official ministries, tax authorities or other public bodies. Secondary commentary is not used as the evidentiary source for a calendar row.
Status matters.
Effective dates, compliance deadlines, official rollout dates and target years are labelled separately. Proposed measures remain visibly proposed until the public legal record changes.
No forced symmetry.
The calendar does not manufacture one item per GCC country. Coverage expands when a future-dated public milestone is verified and reviewed.