Tills and invoices in Oman — the law regulates one of them

Oman regulates the invoice, not the till. There is no fiscal-device regime, no cash-register certification, no sealed-till rule and no instrument that requires you to own a point-of-sale system at all — a shop in Oman can lawfully write a receipt by hand. And that window now has a closing date, because on 9 August 2026 the Tax Authority issued Decision 189/2026, amending the VAT Executive Regulations to mandate electronic invoicing.

What changed on 9 August 2026

Decision 189/2026 does what nothing before it did: it puts electronic invoicing into the VAT Executive Regulations, with dates and a published threshold. It replaces Article 143, inserts three new articles — 143 bis, 143 bis 1 and 143 bis 2 — and replaces the second paragraph of Article 146. Once your phase lands, paper invoices, plain PDFs and emailed images stop being valid tax invoices. Invoices must be issued in an approved, secure structured format through a system connected to an accredited service provider, each with a unique number.

Two provisions matter specifically at a counter. A QR code becomes mandatory on the human-readable invoice for every B2C transaction — that is, on the customer's copy of an ordinary retail sale. And consolidated B2C invoices are prohibited: you cannot batch a day's till sales into one document. Reporting is real time for B2B and within 24 hours for B2C.

This supersedes what we published a week ago, and we would rather say so than quietly diverge. Our e-invoicing guide reported — correctly at the time — that there was no enabling regulation, no published threshold, no QR-code requirement, and phases in August 2026, February 2027 and August 2027. All three of those findings have now moved. The programme architecture described there still holds; the dates and the legal basis do not. We are updating that page.

No Omani law requires you to own a till

This is worth stating flatly, because it is the opposite of what a shop owner is told when buying one. We searched taxoman.gov.om, cbo.gov.om and qanoon.om. We found no fiscal-device regime in Oman: no certification scheme for cash registers, no approved-till list, no sealed fiscal memory, no requirement that a till be registered with any authority, and no rule that a retail business must operate one.

What must appear on a tax invoice

This is the spine of the whole subject. The contents of a tax invoice are set by Article 144 of the VAT Executive Regulations, Decision 53/2021 — confirmed as the operative article by a primary source, the Tax Authority's own VAT Taxpayer Guide — Electronic Commerce of June 2023, which refers a reader to "the same details as the tax invoice provided for in Article (144) of the Regulations".

1. The term "Tax Invoice"
2. The date of issue, the date of supply, and the date of payment
3. The sequential number of the invoice
4. The supplier's full name, address and tax identification number
5. The customer's full name, address and tax identification number
6. A description of the goods and services supplied
7. The quantity of goods
8. The date of any advance payment, if there was one
9. The total consideration excluding tax
10. The applied tax rate
11. Any price discount or reduction granted to the customer
12. The taxable value
13. The value of the tax due

Now the provenance, because it matters. We could not read Article 144's verbatim text on any government page. The Tax Authority's own Arabic PDF of the Regulations truncates for us at Article 39; qanoon.om truncates at Article 69; decree.om is behind a subscription. The list above is a convergence of three independent reconstructions that agree almost word for word, anchored to an article number we verified from a government document. Treat it as reliable and check the Arabic text if a specific line is load-bearing. There is exactly one point on which the three disagree: whether the customer's tax identification number is mandatory or optional. We do not resolve it — put it on the invoice where you have it.

The simplified tax invoice, and the approval almost nobody has

A till receipt is, in Omani terms, a simplified tax invoice. Its contents sit in Article 147:

• The phrase "Simplified Tax Invoice"
• The date of issue, the date of supply and the date of payment
• The supplier's full name, address and tax identification number
• A description of the goods and services, and the quantity of goods
• The total consideration excluding tax, and the applied tax rate
• Any discount, the taxable value, and the tax due

Compare that against the list above and the difference is exactly two things: the customer's details and the sequential number. Everything else survives, including the supplier's tax identification number, which is the field most often missing from a receipt printed by a system configured for another country. A simplified invoice is allowed where the value of the supply is less than OMR 500 excluding tax, or in any other case the Authority specifies — that limit comes from two Tax Authority taxpayer guides, so it is primary.

When the invoice has to exist

The Tax Authority's Input Tax guide is explicit: "The Tax invoice must be issued at the latest within fifteen (15) days following the date on which any of the events requiring the taxable person to issue a tax invoice occurred." A summary invoice covering a month's supplies to a single customer follows the same rule, running from month-end. Note that Decision 189/2026 replaces the second paragraph of Article 146 to hold simplified invoices to the same deadlines.

There is a counterweight worth knowing, from the same guide: input tax deduction "will not be disallowed for minor errors or omissions in the Tax Invoice, provided that the invoice clearly identifies the supplier, customer, nature of supply and it is clear that VAT was charged correctly". A misaligned template is not automatically fatal to your customer's deduction. A missing tax identification number or a wrong tax amount is a different matter — see the penalty below.

Four rules that sit in the Law, not the Regulation

Article 67 of the VAT Law, Royal Decree 121/2020, sets when an invoice is required: on a supply of goods or services, on a deemed supply, and on receiving consideration in whole or part before the date of supply. Article 68 then deals with currency, and it is the rule most likely to leave a small business issuing technically defective invoices. An invoice may be issued in Omani Rial or any other currency, but where it is in a foreign currency, the tax value is to be calculated in Omani Rial at the average purchase and sale rate published by the Central Bank of Oman at the tax due date. So a dollar invoice is fine; a dollar invoice that shows the VAT only in dollars is not.

Article 69 requires regular accounting records that capture imports, exports and supplies in a timely manner. Article 70 sets retention at 10 years from the end of the tax year for tax invoices, accounting records and books and customs documents, extended to 15 years for those relating to real estate.

On that fifteen, two official sources disagree and we are not going to pick one. The Law says 15 years for records relating to real estate. Two Tax Authority taxpayer guides — the Input Tax guide and the Real Estate guide — both say the longer period applies to records relating to capital assets, "and this can be up to 15 years". Those are not the same category. If you hold capital assets but no real estate, you cannot tell from the published sources which period applies to you.

Article 100 is the only invoice penalty in force today. Refusing to issue a tax invoice when required, or issuing an invoice showing an incorrect amount of tax, carries imprisonment of two months to one year and/or a fine of OMR 1,000 to OMR 10,000, and the court may double it on repetition. Note what is not there: no published penalty yet attaches to failing to e-invoice, because the penalty provisions have not been published.

Cards, cash and the counter

Accepting cards is not optional for most shops, and this is separate from tax. The Ministry of Commerce, Industry and Investment Promotion phased in mandatory electronic-payment acceptance from January 2022, and it is enforced — the ministry publicised 40 violations in Al Dhahirah governorate against businesses that had not provided an electronic payment service. The first phase covered:

• Shopping malls and commercial centres
• Cafés and restaurants
• Jewellery stores, gift markets and electronics shops
• Groceries, and vegetable and fruit sellers
• Building-material shops and outlets in industrial areas

Reported alongside the mandate, and label this secondary: transaction fees capped at 1.5% for credit cards and 0.75% for mobile wallets, with terminals provided at no cost to the business through the Central Bank and the banks. Since then the Central Bank has launched Maal, Oman's national payment card, soft-launched on 20 November 2025 with an approved fee structure said to cut payment-acceptance costs by up to half. One primary rule governs what your terminal must do: OmanNet Operating Rules, Book 1, section 3.4.4 — "For all financial transactions, a transaction receipt should be generated and provided to the customer."

Three things Omani law does not say

• Nothing published permits or forbids a card surcharge. We found no Omani rule on passing the merchant fee to the customer. The OmanNet rules do not address it.
• Nothing published says whether you may refuse cash. No rule either way. The electronic-payment mandate requires you to accept cards; it does not say anything about declining notes.
• VAT-inclusive shelf pricing in general retail is unpublished. The Tax Authority's own VAT FAQ page does not address price display at all.

The one traceable price-display rule is narrower than the argument you will have with a supplier about it. Under the Consumer Protection Law, Royal Decree 66/2014, and its Executive Regulation as amended by Consumer Protection Authority Decision 1/2023, the selling price must be written on the product itself, its packaging or its container, clearly and legibly, in Arabic, with other languages permitted alongside. And for restaurants and similar establishments, displayed prices must be inclusive of applicable tax, if any. That restaurant rule is the only VAT-inclusive display obligation we could trace, and we have it from a secondary source rather than from the regulation text.

Choosing a till, as a compliance question

Feature lists are not much use here, because the features that decide the outcome are boring ones. These are the questions we would ask a vendor, in this order, and we would ask for a printed sample rather than a demonstration on a screen.

1. Does the receipt carry every Article 147 particular — including the phrase "Simplified Tax Invoice" and your own tax identification number? Ask to see one printed.
2. Can it produce a full Article 144 invoice too, with customer details and a sequential number, for the business customer who asks for one at the counter?
3. Can it show VAT in Omani Rial to three decimal places, including on a sale priced in another currency?
4. Can it produce Arabic output — not just an Arabic menu for your staff, but an Arabic invoice template?
5. Can it export structured data, and to what format? This is now the question that matters most. When your phase under Decision 189/2026 lands you will be handing invoice data to an accredited service provider, and a system that only produces PDFs is a system you will replace.
6. Can it print a QR code on the customer's copy? Not required today, and required for B2C once your phase starts.

The base-currency trap

Connectivity and hardware in Muscat

Two practical points. First, ask what the system does when the internet drops: a cloud till that cannot take a sale offline and sync later is a real operational risk in parts of Muscat and a serious one outside it. Second, thermal receipt printers, cash drawers, barcode scanners and card terminals are widely available here and are largely generic — the constraint is rarely the hardware, it is whether the software driving it can be made to print the particulars above. Bank-supplied card terminals are a separate device from your till unless you specifically buy an integrated setup, and unintegrated terminals mean somebody keys the amount in twice.

What is actually sold in Oman

The market here divides into four groups. Local integrators in Muscat selling and configuring retail and restaurant POS packages, usually on-premise or hybrid, usually with an installation and support relationship attached. Bank-supplied card terminals from the Omani banks, which handle payment but are not tills. Cloud tills sold internationally, most of which have no Omani localisation at all. And generic hardware from local electronics retailers.

Two findings about this market, both of them plain. The first: most off-the-shelf tills sold in this region are built for another country's tax rules — usually the UAE's or Saudi Arabia's — and a receipt template that satisfies one of those does not satisfy Article 147. The second: no vendor in Oman publishes a price. Focus Softnet's Oman page states that cost varies with business size, terminals, customisation and deployment model and that "you will get a detailed quote from us". Oman Arab Bank advertises ADSL and GSM/4G terminals at "competitive discount rates" without publishing a rate. We looked for a published Omani Rial price for a POS package and did not find one, so we quote none. Expect to negotiate, and expect the quotes you receive to be difficult to compare.

What to do now

1. Work out which side of OMR 5 million in annual supplies you sit on. That decides whether your date is 1 April 2027 or 1 October 2027 — and re-check it against the instrument once the Gazette publishes.
2. Print one of your current receipts and one of your current invoices and check them line by line against Articles 147 and 144 above. Most failures we would expect are a missing tax identification number, a missing "Tax Invoice" or "Simplified Tax Invoice" label, and VAT shown to two decimals rather than three.
3. If you issue till receipts, deal with the Article 148 approval.
4. Fix the base currency before anything else if you are setting a system up.
5. Ask any prospective vendor the structured-export question in writing, and keep the answer.

If you want the Article 148 application dealt with, or a receipt template checked against Articles 144 and 147 before you commit to a system, that is ordinary counter work and our office in Al Ghubra can do it.