UAE TRN Explained: What It Is and How to Check It
A Tax Registration Number is your business's VAT identity in the UAE. Here's what it looks like, where it must appear, and how to check its format.
What a TRN is
A Tax Registration Number (TRN) is a unique 15-digit number the UAE Federal Tax Authority (FTA) issues to VAT-registered businesses. It's your VAT identity, and it must appear on every tax invoice you issue. The free UAE TRN Validator checks that a TRN is in the correct format.
Where the TRN must appear
A valid TRN is required on tax invoices, credit notes, and VAT-related documents. A customer needs your TRN to reclaim input VAT, and you need theirs for B2B invoices — so an incorrect or missing TRN can hold up their VAT claim.
Format check vs verification
The validator confirms a TRN is a well-formed 15-digit number, which catches typos before invoices go out. To confirm a TRN is genuinely registered and active, use the FTA's official "TRN Verification" service on tax.gov.ae.
Get it right automatically
Pyalm Books stores your TRN and your customers' details so every UAE tax invoice carries the right numbers, and you can decode a Saudi counterpart QR with the ZATCA QR Decoder.