Document format and locale facts for Oman

Why these defaults?

The country code comes from ISO 3166. Unicode CLDR supplies presentation-oriented locale, currency, paper, date, language, calendar, numbering, and direction metadata. Defaults reduce setup time; they do not decide what a valid document must contain.

Recorded official or regional-official language tags: ar.

Selected national claims reviewed

Document vocabulary and checks

Oman's detailed VAT-invoice particulars, VAT registration-number vocabulary, baseline ten-year record retention, and current Fawtara five-corner rollout are reviewed from Tax Authority sources. This local document is not a Fawtara e-invoice and cannot select a provider, create an approved structured record, validate, exchange, report, certify or receive authority acknowledgment. Phase selection, simplified invoices, capital assets, sectors and transaction-specific VAT treatment remain conditional current-rule checks.

Evidence snapshot: 5 official sources · last reviewed 2026-07-19. This is scoped guidance, not a jurisdiction-wide compliance certification.

Tax labels: VAT. Business identifier labels: VAT Registration Number.

• Required when applicable: An Oman detailed VAT invoice identifies the supplier and VATIN, issue and supply dates, sequential number, customer, description and quantity, taxable amount, unit price, tax rate, and VAT charged in OMR. Simplified and special transaction rules require separate checks.Evidence OM_OTA_VAT_INFO · reviewed 2026-07-19 · review by 2027-01-19 · automation advisory only
• Required when applicable: Use the Tax Authority VAT registration number when the supplier is VAT registered. Registration produces a tax registration number and carries record and invoice obligations.Evidence OM_OTA_VAT_REGISTRATION · reviewed 2026-07-19 · review by 2027-01-19 · automation advisory only
• Required when applicable: Keep VAT records for at least ten years; official Tax Authority guidance identifies longer retention, up to fifteen years, for relevant capital-asset records.Evidence OM_OTA_VAT_RETENTION · reviewed 2026-07-19 · review by 2027-01-19 · automation advisory only
• Guidance: Fawtara uses a five-corner structured exchange through service providers with authority reporting. The current FAQ schedules selected phase-one participants from August 2026 and later VAT-taxpayer groups in phases. This local preview cannot create, validate, exchange, report, certify, or receive acknowledgment for a Fawtara e-invoice.Evidence OM_OTA_EINVOICING, OM_OTA_EINVOICING_FAQ · reviewed 2026-07-18 · review by 2027-01-18 · automation advisory only

Identifier format guidance: See the relevant authority.