Oman E-Invoicing (Fawtara): 2027 Dates and How to Prepare

Oman e-invoicing is mandatory from 1 April 2027 for VAT-registered businesses whose annual supplies exceed OMR 5 million, and from 1 October 2027 for other covered taxpayers. The programme is called Fawtara. Invoices are exchanged as structured data through accredited service providers in a five-corner model, with the Oman Tax Authority receiving the data.

The timeline has moved during 2026, so this guide sets out the latest dates, explains what changed, and gives small and mid-sized businesses a practical plan. It is based on the Oman Tax Authority's published e-invoicing FAQ and dated adviser reports at the time of writing. It is not legal or tax advice, so confirm your own position with the Tax Authority or a qualified adviser.

Oman e-invoicing at a glance

Item	Position at the time of writing
Programme name	Fawtara
Authority	Oman Tax Authority (OTA)
Legal basis	Decision No. 189/2026 amending the VAT Executive Regulations, published in August 2026
First mandatory date	1 April 2027, for taxpayers with annual supplies above OMR 5 million
Second mandatory date	1 October 2027, for other covered taxpayers
Model	Five-corner exchange via accredited service providers, reported to the OTA
VAT rate	5% standard rate
Voluntary early adoption	Possible, according to the OTA's FAQ

For context on how Oman fits into the wider wave of 2027 mandates, see our overview of e-invoicing mandates in 2027.

The latest Fawtara timeline

The Oman e-invoicing timeline has changed twice in public guidance, which is why many articles online still show different dates.

The earlier phased plan

Through the first half of 2026, the Oman Tax Authority's FAQ described a first rollout in August 2026 covering around 100 large VAT-registered companies selected by the authority. Later rollouts were to follow according to legislation that had not yet been issued. Several advisers filled in later phases for February 2027 and August 2027, but those dates were not confirmed by a legal instrument.

The revised schedule under Decision No. 189/2026

In August 2026, Decision No. 189/2026 was published in the Official Gazette, amending the VAT Executive Regulations. Reported by several advisers and the Oman Observer, it replaced the phased plan with two dates:

1. 1 April 2027: taxpayers whose annual supplies exceed OMR 5 million.
2. 1 October 2027: other taxpayers within scope.

The Oman Tax Authority's e-invoicing FAQ now reflects the April and October 2027 dates. In places it still talks about phases and says SMEs join in a later phase, so read the latest version carefully and treat the authority's direct notifications as the final word on your own date.

Who must comply and how the threshold works

Oman e-invoicing is part of the VAT system, so it applies to VAT-registered taxpayers. Oman's mandatory VAT registration threshold is OMR 38,500 in annual taxable supplies, with voluntary registration available from OMR 19,250. If you are not VAT registered, the e-invoicing rules generally do not reach you yet.

The OMR 5 million figure decides when you start, not whether you are covered. According to the OTA's FAQ:

• You start on 1 April 2027 if your annual supplies from 1 April 2026 to 31 March 2027 exceed OMR 5 million, or if your expected supplies from 1 April 2027 to 31 March 2028 exceed it.
• If neither test is met, you start on 1 October 2027.
• VAT groups are assessed at group level.
• Non-resident taxpayers count only supplies made in Oman.
• The supplies counted include taxable supplies (excluding capital assets), reverse-charge supplies and intra-GCC supplies of goods and services.

Worked example

A Muscat building supplies distributor had supplies of OMR 4.6 million in the year to 31 March 2027, so it fails the backward-looking test. But it has signed a framework contract that will lift supplies to about OMR 5.4 million in the year from 1 April 2027. On the forward-looking test it exceeds OMR 5 million, so it should plan for the 1 April 2027 start. A neighbouring retailer with OMR 900,000 of supplies is VAT registered but well under the threshold, so its date is 1 October 2027.

How the five-corner model works

Oman e-invoicing uses a five-corner model, which is similar in shape to the Peppol networks used in Europe and Asia. Our guide to what Peppol is explains the network idea in plain English.

1. Supplier creates the invoice in its accounting or ERP system.
2. Supplier's accredited service provider validates the data and sends it on.
3. Buyer's accredited service provider receives it.
4. Buyer receives the structured invoice in its own system.
5. Oman Tax Authority receives the invoice data for tax purposes.

The OTA describes e-invoices as electronically certified, with a unique verification code, and exchanged instantly between seller, buyer and the authority. Advisers report an Oman-specific Peppol specification, often referred to as PINT OM, and some guidance says B2C invoice data must reach the authority within 24 hours. Treat these technical points as items to confirm in the OTA's published specifications. If you want to understand how this differs from a central platform such as Saudi Arabia's, read our comparison of Peppol and clearance models.

What changes for invoice content

The fields on an Oman VAT invoice do not disappear. What changes is the format. Today, an invoice is a document a person reads. Under Oman e-invoicing it becomes structured data that systems read. In practice this means:

• Your VAT number and your customer's VAT number must be accurate, because systems will validate them.
• Invoice numbers must be unique and sequential. Our invoice numbering system guide explains good practice.
• Credit notes and corrections must reference the original invoice. Ad hoc fixes on a PDF will not work.
• Amounts, tax rates and totals must reconcile exactly, line by line.
• Customer names and addresses should be held in clean master data, not typed fresh on each invoice.

A useful way to see the difference is to compare a PDF and a structured invoice side by side, which our article on e-invoices vs PDF invoices does.

A preparation plan for 2027

Whether your date is April or October 2027, the work is similar. A small business can usually prepare in three to six months if it starts early.

1. Confirm your status. Check your VAT registration, calculate supplies for both threshold periods and note your start date.
2. Map your invoice flows. List every place an invoice or credit note is created: accounting software, point of sale, spreadsheets, manual books.
3. Pick an accredited service provider. Use the Tax Authority's list of accredited providers, and ask about pricing per invoice, integration options and support in Arabic and English.
4. Check your software. Ask your accounting or ERP vendor when it will support Oman e-invoicing and how it connects to your provider.
5. Clean master data. Verify customer VAT numbers, legal names and addresses.
6. Test. Send test invoices, credit notes and cross-border cases before go-live.
7. Train staff. Make sure the people who raise and correct invoices understand the new rules.

Budgeting example

A trading company issues 1,500 invoices a month. If a provider charged, say, OMR 0.050 per invoice, that would be OMR 75 a month, or OMR 900 a year, before any setup fee. Prices vary widely, so get quotes from more than one accredited provider and compare the total cost, not just the per-invoice fee.

Common preparation mistakes

• Waiting for the October date to start work. Service providers and software vendors will be busy in the months before each go-live. Book onboarding early.
• Forgetting minor invoice sources. A branch that still writes invoices by hand, or a sales team that sends spreadsheet invoices, can break compliance even when the main system is ready.
• Ignoring incoming invoices. Oman e-invoicing affects what you receive as well as what you send. Your accounts payable team needs to receive, check and record structured invoices from suppliers.
• Testing only simple invoices. Credit notes, partial payments, advance payments, discounts and foreign currency invoices are where errors show up. Test them all.
• Assuming the threshold test is a one-off. If your supplies jump, the forward-looking test can bring your date forward. Recheck your figures before the first date.

Oman VAT invoices until your go-live date

Until Oman e-invoicing applies to you, the existing VAT invoice rules still apply. A full tax invoice normally needs the words "Tax Invoice", your name, address and VAT number, the customer's details and VAT number where they are registered, a sequential number, the issue date and supply date, a description of the goods or services, the taxable amount, the 5% rate, the VAT amount in Omani rials and the total. Simplified invoices are allowed in some cases, such as certain sales to consumers.

A worked example: a Muscat marketing agency bills a VAT-registered client OMR 2,400 for a campaign. VAT at 5% is OMR 120, so the total due is OMR 2,520. If the agency invoices in US dollars, the VAT amount should still be shown in Omani rials, using an acceptable exchange rate. Our guide to a foreign currency invoice covers how to show both amounts clearly. Getting these basics right now makes the switch to structured data much easier, because the same fields will be checked automatically later.

Penalties and risk

At publication, advisers noted that Decision No. 189/2026 did not include a separate penalty schedule for e-invoicing. Do not read that as a free pass. Oman's VAT Law already penalises failures to issue proper tax invoices and to keep records, and the authority can issue more rules before go-live. The practical risk is also commercial: large customers that are already live may refuse to pay invoices they cannot receive through the network.

Where PDF invoices still fit

PDF invoices are not going away overnight. Until your Oman e-invoicing start date, you can keep issuing VAT invoices that meet the current rules. After it, PDFs remain useful for quotes, pro forma invoices, non-VAT documents and human-readable copies.

Businesses that sell outside Oman are also in a mixed position. A Muscat consultancy may need structured e-invoices for Omani clients from 2027 while still sending PDF invoices to clients in countries without a mandate. Keep both workflows documented so staff know which route each customer needs, and record which invoices went through the network and which did not.

Our free invoice generator creates PDF invoices in the browser with one tax rate, so you can set Oman's 5% VAT, add your logo and choose a currency. It does not create Fawtara e-invoices, does not connect to a service provider and does not report anything to the Tax Authority. When your mandate begins, use an accredited provider for covered invoices. For a clean layout in the meantime, try the corporate invoice template.

Conclusion

Oman e-invoicing now has firm dates: 1 April 2027 if your annual supplies exceed OMR 5 million and 1 October 2027 for other covered taxpayers. Confirm your date, pick an accredited service provider, clean your data and test early. Keep an eye on the Oman Tax Authority's FAQ, because the guidance has moved during 2026. Until then, our invoice generator can handle quotes and current PDF invoices, and you can browse more country guides in our tax compliance section.