Problem #

While collecting Value-Added Tax (VAT) for the United Kingdom, you see the following error:

The supplied VAT number is not valid

Cause #

HMRC shut down a required API endpoint on 2025-02-17. As a result, your current WHMCS version cannot validate UK VAT numbers.

Solution #

To address this problem, WHMCS 8.13 and later include new UK VAT validation options that allow you to validate UK VAT numbers using official UK tax authority records or manually.

To resume validating UK VAT numbers, update to WHMCS 8.13 or later.

Last modified: 2025 May 8