Validate VAT on the checkout page to enhance the checkout experience. Allow your customers to add VAT number while registration, on checkout, shipping and billing pages. It will restrict the user if the VAT number is invalid. The easiest way for customers, to calculate the total price of the product including VAT before hitting the final purchase button.
Admin has an option to mark the field as required OR optional. The VAT validator field will only appear if it is set so via back-end by admin.