What if I cannot provide a VAT number? EcoVadis Support (BOA) January 15, 2018 12:37 Updated VAT number is mandatory for companies within the European Union. If your company doesn't have a VAT (Value Added Tax) number, you can indicate "NA". For European companies, please note that VAT will be charged to companies within the European Union who do not provide a valid VAT number. Related articles What if I cannot provide a DUNS number? Do I have to pay to register? Can I review the questionnaire before registering? How long does it take to register? What should I prepare to complete the questionnaire? Comments 0 comments Article is closed for comments.