What is the tax identification number?
Published
The tax identification number is the identifier ZATCA issues to a taxpayer, used in every tax interaction: invoices, returns, correspondence, and the e-invoicing system. The VAT registration number shown on invoices is a 15-digit number.
Three numbers not to confuse
| Number | Issuer | Purpose |
|---|---|---|
| Commercial registration (CR) | Ministry of Commerce / Saudi Business Center | Proof the legal entity exists |
| Tax number / VAT registration number | ZATCA | Tax dealings and invoicing |
| GOSI establishment number | GOSI | Employees and contributions |
One business holds all three, each with its own use. Putting the CR number in the tax number field makes the invoice defective.
Where the tax number must appear
- Your invoices: your VAT number is a mandatory field on every tax invoice, and it sits inside the QR code data (tag 2).
- Your suppliers' invoices: the supplier's VAT number is a condition of the invoice you deduct input tax on, and your own number is required on a standard invoice if you are registered.
- Returns and correspondence with the authority.
- The shop and website, where requirements call for registration details to be displayed.
Why you verify a supplier's number before paying
The recurring scenario: an unregistered supplier adds "15% VAT" to the bill and keeps it. The effect on you is double:
You paid 15% extra ← to a supplier who remits nothingAnd deducted input VAT ← on an invalid invoice, disallowed at audit
On a SAR 23,000 "tax-inclusive" bill, the potential loss is SAR 3,000 overpaid plus SAR 3,000 of rejected deduction.
Verification is quick: scan the QR code on their invoice and compare the name and number, or use the verification tools available through the authority's channels. Make it a step in onboarding any new supplier before the first payment, not after the problem.
Frequently asked questions
Does my tax number change if I change activity or add branches?
The taxpayer's tax identity stays with the entity. Activity and branch updates are made in your file with the authority without invalidating prior invoices.
I lost my registration certificate - what now?
Your details and certificate are retrievable from your account on the authority's portal. What matters is never issuing invoices with a number typed from memory or an old template.
A customer refuses to pay until I provide my tax number - is that normal?
Normal and correct - they are protecting their deduction exactly as you should with your suppliers.