Hello and thank you for your feedback regarding the VAT validation feature. We understand the importance of this functionality for EU-based businesses. Currently, SellKit does not include a built-in VAT validator.
We encourage you to submit your feature request on our dedicated platform: https://sellkit.canny.io/feature-requests/p/vat-validator
We prioritize feature development based on user interest, and your input is invaluable in this process.