[Zenst]

Thank you, I grew up in the UK so the whole US invoices quirks and issues you mention are literal new to me and appreciate the perspective and experience. I do know that the Inland Revenue in the UK and TAX laws have always mandated VAT numbers have to be upon the invoice and other such stipulations. So do wonder how they handle UK invoicing with regards to VAT, but not had any dealing with them.

Did deal with few US companies in the 90's, Sprint and telco's and never an issue there, but then different times and corporate structure with those.

That said EU countries still vary and https://ec.europa.eu/taxation_customs/vat-invoicing-rules_en kinda shows how not having the VAT number can still be valid and legal as well.

Yet you still get country nuances within EU members.

In the UK, VAT invoices is kinda the rule of registered for VAT and the rules https://www.gov.uk/guidance/record-keeping-for-vat-notice-70...