Oman sets mandatory e-invoicing dates for 2027

Oman’s Tax Authority (OTA) has taken a significant step towards the introduction of mandatory e-invoicingElectronic invoicing - widely referred to as e-invoicing - is the exchange of a digital document between a supplier and a buyer. E-invoices are issued, transmitted and received in a structured data format that enabled automatic and electronic processing. They contain data in a machine-readable format so that an AP system can read an invoice without manual data entry, leading to faster and more efficient invoicing., with Decision No. 189/2026 establishing the legal framework for electronic tax invoices and setting two mandatory implementation dates in 2027.

Under the new timetable, around 100 large VAT-registered businesses have signed up for the pilot phase starting in August 2026. The OTA have encouraged these taxpayers to go-live by October 2026 instead of the mandatory implementation timelines announced by the Decision. They have also clarified that there would be no penal implications for taxpayers that were part of the pilot phase for non-compliance with e-invoicing requirements up to 31^st March 2027.

Any VAT-registered businesses with annual supplies exceeding OMR 5 million will need to comply from 1^st April 2027, while all other VAT-registered businesses will come into scope from 1^st October 2027.

With the deadlines now established in legislation, businesses should be moving beyond monitoring developments and towards assessing what they need to do to prepare.

What does the new requirement mean for businesses?

The move to e-invoicing is about more than changing the format of an invoice.

Businesses will need to consider how invoice data is generated within their ERPEnterprise resource planning (ERP) is a type of software that organisations use to manage main business processes. and finance systems, how it is validated, how it is exchanged with customers and how the required information is reported to the Tax Authority.

This makes data quality and ERP readiness particularly important.

The OTA highlights benefits including improved data accuracy, reduced errors, easier auditing, secure archiving, integration with business systems and real-time reporting.

For businesses preparing for Fawtara, these same areas can become potential challenges if existing master data, tax configuration or invoice processes are not ready.

Key areas to assess include:

ERP and finance systems

Can your existing ERP generate the information required for an Oman-compliant structured invoice? Does your current configuration support the required tax and invoice data?

Tax determination

Are VAT rates, tax codes, exemptions and other tax rules correctly configured and consistently applied?

Master data

Is customer and supplier information accurate and complete? E-invoicing places greater importance on the quality and consistency of the data flowing into invoices.

Integration

How will your ERP connect to an accredited service provider and the Fawtara network? What changes will be required to your existing architecture?

Invoice processes

Businesses should consider both outgoing and incoming invoices, including how invoices will be generated, exchanged, received, validated and stored.

Reporting and controls

With tax authorities receiving increasingly detailed transactional data, businesses should also consider how they will monitor exceptions, reconcile invoice data and identify errors before they become compliance issues.

Why businesses should start preparing now

For businesses falling into the April 2027 deadline, the timeline is already relatively short.

Implementation is unlikely to be as simple as selecting an e-invoicing provider and switching it on. Businesses first need to understand their current systems and processes, identify gaps and determine what needs to change.

The move towards structured e-invoicing can expose issues that may have previously been hidden within existing processes – from inconsistent customer information to incorrect tax treatment or incomplete invoice data.

This is why e-invoicing readiness should be considered as part of a wider tax technology and data strategy, rather than simply an invoicing project.

Our e-invoicing readiness workshops help you assess your current landscape, understand the requirements and build a practical roadmap towards compliance. You can find out more about them here.