EInvoicing in Oman

Mandatory Electronic Invoicing in Oman

Learn how to get your company ready to exchange documents in accordance with Oman requirements with the support of Comarch

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Oman is on the Road to E‑invoicing

B2B and B2G e-invoicing is currently in the pre-implementation phase in Oman. The Oman Tax Authority (OTA) has confirmed plans to restart its electronic invoicing system initiatives, with the first phase of mandatory B2B adoption scheduled for August 2026.

The initiative, previously delayed, will begin with the 100 largest taxpaying companies in the country, initiating a gradual rollout that will continue into 2028.

E-Invoicing Implementation timeline

Implementation timeline

The system will be implemented in four phases, each targeting a specific group as follows:

  • Phase 1: One hundred large VAT-registered companies, implementation begins in August 2026.
  • Phase 2: All large VAT-registered companies, implementation begins in February 2027.
  • Phase 3: All remaining VAT-registered companies, implementation begins in August 2027.
  • Phase 4: Government institutions and entities, implementation begins in February (year to be announced).

A company that is not targeted in the first Phase can apply the system voluntarily.

E-invoicing process description

E-invoicing process description

OTA has adopted a Peppol-based 5-corner model. This framework ensures real-time reporting to the tax authority (the 5th corner) while maintaining seamless interoperability between business partners, aligning Oman with international standards used in the UAE and Singapore.

Who is obliged to use e‑Invoicing in Oman

E-invoicing is currently voluntary in Oman, with phased mandatory obligations for B2B starting in August 2026 and broader B2G requirements to follow in 2028.

Archiving Requirements for e‑Invoicing in Oman

The required storage period is 10 years (5 years in the system and 5 years in an electronic archive).

How Can We Help

As an experienced Peppol Service Provider, Comarch ensures seamless integration with the OTA’s 5-corner model, enabling our clients to meet Omani regulations efficiently.

Why is Comarch the best choice?

We have 20+ years of experience in carrying out various EDI, e-invoicing, and other document exchange projects around the world. In those years, we have successfully connected more than 130,000 entities from over 60 countries.

  • 1. Legal compliance

    Full compliance with the latest data exchange regulations and modern data transfer standards

  • 2. Digitization

    Applying new technologies and IT solutions in order to streamline workflows and automate activities and procedures

  • 3. Individual approach

    Tailor-made solutions based on processes specific to each company – own road map and a suitable pace of changes

  • 4.Security

    Highest level of security for all sensitive and important company data

    Read more about Comarch e-invoicing

    Legal regulation changes in Oman

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