# UAE TRN check: is this TRN number valid?

> A UAE Tax Registration Number (TRN) has exactly 15 digits and begins with 100. This checker confirms the format and catches typos. To confirm that a TRN is actually registered and belongs to the supplier, use the TRN verification tool on the FTA website (tax.gov.ae).

Interactive calculator: https://www.countify.ae/tools/trn-validator · Updated 2026-10-14 · Countify UAE

## What the format check catches

Sample inputs (not real TRNs).

| Input | Digits entered | Format looks valid |
| --- | --- | --- |
| 100123456700003 | 15 | Yes |
| 100 1234 5670 0003 | 15 | Yes |
| 10012345670000 | 14 | No |
| 200123456700003 | 15 | No |

Only the FTA's own verification confirms that a TRN is live and belongs to the business named on the invoice.

## Why check a TRN?

You can only recover input VAT on a valid tax invoice from a registered supplier. If the TRN on an invoice is mistyped, belongs to another company or has been cancelled, the FTA can deny your input VAT claim in an audit. A quick format check catches most typos before the invoice is booked.

Our [TRN verification guide](https://www.countify.ae/blog/trn-verification-uae) walks through the FTA's official checker step by step, explains what each result means and covers how to find your own TRN.

## What a TRN looks like

Every UAE TRN is a 15-digit number, and current TRNs start with 100. It is the same number for VAT and corporate tax for most businesses. TRNs contain no letters, so an O instead of a 0 is a common invoice mistake.

- Exactly 15 digits
- Starts with 100
- Digits only: no letters or symbols

## Legal basis

- Cabinet Decision No. 52 of 2017 (VAT Executive Regulation), as amended (https://tax.gov.ae/en/legislation.aspx)

## Frequently asked questions

### How many digits is a UAE TRN?

15 digits, starting with 100.

### Does a valid format mean the TRN is registered?

No. The format check only catches typos. Use the FTA's TRN verification tool on tax.gov.ae to confirm it is live and matches the company name.

### How do I find a company's TRN?

It must be printed on every tax invoice the company issues. The FTA tool verifies a TRN you already have; it does not search by company name. Our [TRN guide](https://www.countify.ae/blog/trn-verification-uae) explains the options.

### Is the corporate tax TRN different from the VAT TRN?

For most businesses it is the same 15-digit number. Businesses that registered for corporate tax but not VAT receive a TRN at corporate tax registration.