I think (self-employed, not from the US) that it needs to be a registered business entity (e.g. LLC) to give out invoices. Most of it has to do with taxes and r

I think (self-employed, not from the US) that it needs to be a registered business entity (e.g. LLC) to give out invoices. Most of it has to do with taxes and regulations surrounding embezzlement/money laundering, Anytime you spend money as a business, that transaction needs to be accounted for, usually by more than two entities (you and your bank). And yes, the invoice needs to have the information needed to identify both parties (business id/tax number).