Oman: Implementation of e-invoicing from August 2026

Selected taxpayers notified of first phase of implementation of e-invoicing effective August 2026.

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October 6, 2025

The Oman Tax Authority (OTA) notified the taxpayers selected to begin the first phase of implementation of electronic invoicing (e-invoicing) effective August 2026, and as part of the process, to complete a survey form by October 12, 2025.

The OTA’s notification also outlined tentative implementation timelines:

Timeline

Activity planned

November 2025

Publication of e-invoicing specifications on the OTA website

December 2025

Announcement of accredited service provider (ASP) standards

December 2025

Commencement of workshops (with the selected taxpayers)

February 2026

Launch of the developer/test portal for ASPs

May 2026

Commencement of ASP registration and accreditation

August 2026

Phase 1 go live

August 2028

Completion of all phases of e-invoicing implementation


Based on these timelines and the OTA’s previous communication regarding the implementation of e-invoicing (read TaxNewsFlash), it is expected that:

  • Phase 2: Remaining large taxpayers that do not go live in phase 1 will be required to implement e-invoicing within six months of phase 1 (by February 2027).
  • Phase 3: Remaining taxpayers will be required to implement within six months of phase 2 (by August 2027).
  • Phase 4: Government entities will be required to implement within one year of phase 3 (by August 2028).

Read an October 2025 report prepared by the KPMG member firm in Oman

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