Fawtara and e-invoicing Oman: Decision 189/2026 sets the legal dates
Muscat, 9 August 2026 – The Oman Tax Authority (OTA) has for the first time given mandatory e-invoicing Oman a legal basis, through Decision No. 189/2026. The decision amends the Executive Regulations of the Omani VAT Law and fixes two commencement dates: 1 April 2027 for taxable persons with annual supplies above OMR 5 million, and 1 October 2027 for all other VAT-registered businesses. Until this decision, the Fawtara programme had run for more than a year on announcements alone, with no regulation behind it.
What has changed since July
On 15 July, Peppol.nu reported on Oman opening ASP accreditation for Peppol Serviceproviders. That article covered the infrastructure: Release 2 of the Fawtara platform, the accreditation criteria for Peppol Serviceproviders and the Peppol 5-corner model. Three things have materially changed since then.
First, there is now a legal basis. Decision No. 189/2026 amends the Executive Regulations made by Decision No. 53/2021, under the VAT Law issued by Royal Decree 121/2020. The decision itself is short: Article 1 makes the amendments, Article 2 repeals anything that conflicts with it, and Article 3 provides for publication in the Official Gazette and sets the two commencement dates.
Second, the dates have moved. The July article still worked from Phase 1 on 1 August 2026, followed by February 2027 and August 2027. That schedule no longer carries legal effect.
Third, the nature of the scoping test has changed. The OTA no longer assigns cohorts. A business now reads its own date off its own figures.
The four-phase schedule has been replaced by a turnover test
The earlier schedule ran in four phases: roughly one hundred selected large taxpayers from August 2026, the remaining large taxpayers from February 2027, all other VAT-registered businesses from August 2027, and government entities in a fourth phase. One threshold and two dates now take their place:
- 1 April 2027 for taxable persons with annual supplies above OMR 5 million.
- 1 October 2027 for taxable persons with annual supplies of OMR 5 million or below.
The roughly one hundred selected companies still start at the end of August 2026, but now without any legal duty, because nothing is required before April 2027. That first group is effectively a voluntary pilot. Under the OTA FAQ, companies outside the group may also adopt early on a voluntary basis, with support from the authority.
Two caveats matter for planning. At the time of the first published analyses, the text of Decision No. 189/2026 had not appeared on the OTA portal, and the Fawtara FAQ still shows the old four-phase schedule with a last-updated date of 30 June 2026. Anyone building a project plan on that FAQ is working from superseded dates. Onboarding of government entities is not addressed in Decision No. 189/2026 and remains proposed for 2028.
E-invoicing Oman follows VAT registration, not establishment
This is the provision that makes the topic relevant well beyond the Gulf. The obligation follows VAT registration in Oman, not physical establishment. A Dutch or Belgian business with an Omani VAT registration is therefore in scope, and the turnover threshold only decides whether that happens in April or October 2027.
The reverse is equally important. Foreign suppliers without an Omani VAT registration fall outside Fawtara. The Omani buyer then self-accounts for VAT under the reverse charge and no Fawtara e-invoice needs to be exchanged. The practical question for finance and tax teams is therefore not whether they invoice into Oman, but whether their own entity is VAT-registered there.
What the amended articles require
The decision replaces two articles and adds three. Article 143, replaced, requires the taxable person to issue the invoice in an approved, secured electronic format with a unique number for each invoice. Paper invoices, PDF files and images emailed to a buyer stop counting as tax invoices once the duty applies. The obligation also covers supplies to persons not subject to tax, which places B2C inside the scope from day one rather than in a later phase. Article 146 brings the simplified tax invoice onto the same deadlines.
The three new articles provide that the OTA must publish the list of licensed service providers, that system security sits with the taxable person rather than the service provider, and that the Chairman may grant a temporary exemption on application.
Technically, nothing changes from what was already known in July. Invoices follow PINT OM Billing and travel through an accredited service provider to the Fawtara portal, within the Peppol 5-corner model in which the OTA is the fifth corner. Sending invoices directly from an ERP system to the OTA is not permitted.
Penalties and retention
Under Article 202 of the Executive Regulations of the VAT Law, penalties for non-compliance range from OMR 500 to OMR 5,000 per infraction, with business suspension as a possibility for serious or repeated offences. Electronic archiving remains mandatory for ten years. One nuance is worth stating plainly: the OTA has not published a penalty schedule specific to e-invoicing, and Decision No. 189/2026 attaches no fines of its own. Enforcement therefore runs through the existing VAT framework.
What Dutch and Belgian businesses should do now
- Check whether your organisation or a group entity holds an Omani VAT registration. That is the only test that decides whether you are in scope.
- Then use annual supplies to determine whether April 2027 or October 2027 is your date.
- Ask your Peppol Serviceprovider directly whether Fawtara accreditation in Oman is under way or complete. Existing Peppol certification gives a head start on the Oman Test Suite, but does not replace it.
- Budget separate configuration time for the country-specific PINT OM fields and the link to an accredited service provider.
- Build the ten-year electronic retention requirement into your archiving policy.
The pattern is becoming familiar: first a programme and a timeline, then the legal instrument that makes the dates binding. Slovakia took the same step towards 2027. With Decision No. 189/2026, e-invoicing Oman is no longer an announcement but a statutory deadline, and the first group has just over seven months of preparation left. Want to know which providers have international Peppol experience and work with mandates outside Europe? Compare the options in the Peppol.nu comparison tool.
Sources
- Oman Tax Authority, announcement of Decision No. 189/2026 (9 August 2026)
- Oman Tax Authority, VAT Law and Executive Regulations, including Decision No. 53/2021
- e-Invoice.app, Oman Puts Its e-Invoicing Dates in Law: 1 April and 1 October 2027 (10 August 2026)
- VAT IT, Oman’s e-Invoicing Rollout Just Changed: Updated Timeline for 2026 and 2027 (11 August 2026)
- VATupdate, Oman Mandates Nationwide E-Invoicing Under New VAT Decision (10 August 2026)
- VATupdate, Oman Sets 2027 E-Invoicing Deadlines for VAT Businesses (18 August 2026)
- Oman Tax Authority, Fawtara e-invoicing FAQ
