UAE TRN Validator

UAE TRN format primer

The UAE Federal Tax Authority issues a Tax Registration Number (TRN) to every VAT-registered business under Federal Decree-Law 8/2017. A valid TRN has the following characteristics:

Structure

• Exactly 15 digits, no letters, no special characters
• First digit indicates entity type: 1 = corporate / legal entity · 2 = individual taxpayer
• First three digits are the FTA-issued prefix. Most UAE company TRNs start with 100 to 103 (FTA's primary corporate range).
• Remaining 12 digits are the sequential identifier — FTA's internal numbering, not a public sequence.

Common formatting variants you'll see

Different sources present TRNs differently — all are equivalent once normalized:

• Continuous: 100123456789012 (FTA's official format)
• Space-grouped: 100 1234 5678 9012 (some invoices use this)
• Hyphenated: 100-1234-5678-9012 (less common)

This validator strips spaces, hyphens, dots, and parentheses before checking — so all three above produce the same result.

Why your customer's TRN matters

Federal Decree-Law 8/2017 Article 67 requires every B2B tax invoice to include both the supplier's TRN and the customer's TRN if the customer is VAT-registered. Issuing an invoice with an invalid customer TRN can cost your customer their right to recover input VAT — and triggers FTA-audit attention for both parties.

Validate every new customer and supplier's TRN on creation. Most ERPs (including HIBR ERP) do this automatically on customer-master entry.