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VAT and German freelance working on international project
11 / 111 / 11111 looks like the (old) tax number: it is used by the tax office to know who you are, it isn't good at all for the spanish company. It would even change when you move inside Germany.  VAT IDs are not exclusive to GmbHs (but a GmbH always has one). As freelancers you can get at VAT ID but you don't always have to.  The tax office offers a "small business" treatment (§ 19 UStG) for freelancers, kind of an opt-out for the VAT ID. As you do not have a VAT ID, this is probably your case. It means So what to do? If I were you, I'd write them that according to §19 UStG and the European Council Directive 2006/112/EC of 28 November 2006 on the common system of value added tax, TITLE XII CHAPTER 1 "Special scheme for small enterprises" you were not assigned a VAT ID, and VAT is not applicable to your bill. The fact that VAT is not applicable in this case does not mean that they are allowed to refuse payment.  I heard a rumour (but don't really know) that a number similar to the VAT ID is planned also for freelancers (Wirtschafts-IDNr.). You could go to your tax office and ask them about. Maybe that yields a number that satisfies spanish burocracy. AFAIK, you can go to your tax office and ask them to give you a real VAT number.  But careful: that has the serious drawback that you have to do do an advance VAT estimate and pay that to the tax office at least quarterly (for bigger business monthly). And (AFAIK) you are not allowed to change back to the small business treatment for several years.