( Guide · Custom software · Oman )
E-invoicing in Oman (Fawtara): deadlines, requirements and how to get your systems ready
By OGB Labs · Published
Fawtara deadlines: who must comply and when
The dates below come from Decision No. 189/2026, which amended Oman's VAT Executive Regulations in August 2026 and replaced the earlier timetable of August 2026, February 2027 and August 2027. Check the current position on the Oman Tax Authority's Fawtara portal before you plan: dates and technical rules can change. This guide was checked in October 2026 and is not tax advice.
| Phase | Who | From |
|---|---|---|
| Pilot | About 100 large taxpayers notified by the Tax Authority | August 2026 |
| Phase 1 | VAT-registered businesses with annual supplies above OMR 5 million | 1 April 2027 |
| Phase 2 | All other VAT-registered businesses, at or below OMR 5 million | 1 October 2027 |
| Government entities | Government bodies | Not yet announced |
What counts as an e-invoice in Oman
An e-invoice is not a PDF. It is a structured data file that the buyer's and the Tax Authority's systems can read without a person retyping it. Under the amended regulations an e-invoice must:
- Be issued in an approved XML format that systems can read, analyse and process automatically. Service providers and published technical guidance describe the format as UBL 2.1 XML under Oman's PINT OM specification.
- Carry a unique invoice number and be issued from a secure electronic system, protected against unauthorised access and able to recover lost data.
- Stay readable, intact and verifiable for the whole retention period.
- Be issued within 15 days of the event that triggers the invoice, for both tax invoices and simplified invoices.
How Fawtara works: the five-corner model
Fawtara follows the Peppol five-corner model. You do not send invoices to the Tax Authority directly. Your system sends them to an accredited service provider, which validates and delivers them.
Corner 1, the supplier. Your accounting, ERP or point-of-sale system creates the invoice data.
Corner 2, the supplier's accredited service provider. It checks the invoice against the rules and converts or forwards it in the approved format.
Corner 3, the buyer's service provider. It receives the invoice over the network.
Corner 4, the buyer. The invoice lands in the buyer's system as data, ready to post.
Corner 5, the Oman Tax Authority. It receives the tax data for reporting and checks.
What to do now: a readiness checklist
Most of the work is not the e-invoice itself. It is clean master data and a reliable link between your systems and your provider. Businesses in Phase 2 have until October 2027, but integration and testing take months, not days.
Confirm your phase. Use your annual supplies to see whether you fall above or below OMR 5 million, and whether you received a notice for the pilot.
List every system that issues invoices
Accounting software, ERP, point of sale, ecommerce store, a booking or billing app, and any invoices still written by hand.
Ask each software vendor in writing whether and when their product will produce Fawtara-compliant XML and connect to an accredited provider.
Choose an accredited service provider through the Fawtara portal, and check that it supports the systems you use.
Clean your data
Your VAT number, customers' VAT numbers and addresses, product tax categories and VAT rates. Wrong master data is the most common reason an invoice fails validation.
Build or configure the integration, then test it in the provider's test environment with real invoice types: standard, simplified, credit notes and debit notes.
Plan storage. Keep e-invoices readable and verifiable for the full retention period, in your own systems as well as your provider's.
Train finance and sales staff on what changes: no more editing a PDF after it is sent, and corrections go through credit or debit notes.
Common systems and the work each one needs
The effort depends on what issues your invoices today. This table is how we scope the work with clients.
| Your setup | Usual route | Main risk |
|---|---|---|
| Cloud accounting software | Vendor's own Fawtara update, linked to a provider | Vendor not ready before your phase |
| ERP (SAP, Oracle, Microsoft Dynamics, Odoo) | Vendor module or a provider connector, configured to your data | Custom fields and old data that fail validation |
| Custom or in-house system | Custom integration to the provider's API | No one left who knows the code |
| Point of sale for retail | POS vendor update or a provider connector | High volumes of simplified invoices |
| Ecommerce store | Order data sent from the store to the provider | Refunds and partial returns mapped wrongly |
| Spreadsheets or Word invoices | Move to compliant accounting software first | Little time left to change how you work |
Is anyone exempt?
- Businesses not registered for VAT are outside Fawtara. In Oman, VAT registration is mandatory once annual taxable supplies exceed OMR 38,500.
- The regulations allow limited exemptions granted by the Chairman of the Tax Authority, on application with acceptable documents, for businesses that file and pay VAT on time.
- Government entities come later, on a date not yet announced.
How OGB Labs helps
OGB Labs builds the software side of Fawtara readiness: mapping your invoice data, connecting your ERP, point of sale, ecommerce store or in-house system to an accredited service provider, testing every invoice type and monitoring the link after go-live. We work alongside your accountant or tax adviser, who owns the tax decisions. See custom software development in Oman and our custom software service, or message us on WhatsApp at +968 7111 0727. For payments on your store, read our guide to payment gateways in Oman. If Fawtara has you questioning your ERP, our guide to ERP vs custom software in Oman helps you decide what to keep and what to build. Trading in Saudi Arabia too? Read our guide to ZATCA e-invoicing Phase 2. In the UAE, see UAE e-invoicing.
Fawtara applies only to VAT-registered businesses. If you are not sure whether your store or app has to register, read our guide to Oman VAT registration for online sellers.
( FAQ )
Questions people ask.
When does e-invoicing become mandatory in Oman?
From 1 April 2027 for VAT-registered businesses with annual supplies above OMR 5 million, and from 1 October 2027 for all other VAT-registered businesses, under Oman Tax Authority Decision No. 189/2026. A pilot with about 100 large taxpayers began in August 2026.
What is Fawtara?
Fawtara, Arabic for invoice, is the name of the Oman Tax Authority's e-invoicing system. Invoices are issued as structured XML and exchanged through accredited service providers on the Peppol five-corner model.
Is a PDF invoice still valid in Oman after the deadline?
No. Once your phase starts, paper invoices, PDFs and scanned images sent by email no longer count as tax invoices. The invoice must be issued in the approved XML format through an accredited provider.
Do small businesses in Oman need e-invoicing?
Yes, if they are registered for VAT. Businesses at or below OMR 5 million in annual supplies must comply from 1 October 2027. Businesses that are not VAT-registered are outside the system.
Do I send e-invoices to the Tax Authority myself?
No. Your system sends each invoice to a service provider accredited by the Tax Authority, which validates it, delivers it to the buyer's provider and reports the tax data to the Authority.
Does my accounting software already support Fawtara?
Ask your vendor in writing. Many vendors are adding support, but the date matters: it must be ready, tested and connected to an accredited provider before your phase starts.
How long does it take to get ready?
It depends on your systems. A cloud accounting package with a vendor update can be quick. An ERP with custom fields, or an in-house system, needs data mapping, integration and testing, which takes months. Start well before your deadline.
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