IVA intracomunitario is how IVA works on operations with companies in other EU countries. If you're registered in the ROI and have a NIF-IVA, B2B services are invoiced without IVA (the client accounts for it) and the operation is declared in the modelo 349.
IVA intracomunitario is how IVA works when you invoice companies in other EU countries. For business-to-business services, the general rule is that the invoice goes without IVA: the client declares it in their own country (reverse charge).
To do it correctly you need to be registered in the ROI (Register of Intracommunity Operators), which assigns you a NIF-IVA (your NIF with ES in front). That registration must be active on the day you issue the invoice, and the operation is reported in the modelo 349.
Invoicing the EU without IVA is legal and common, but only if your ROI is active and the client's NIF-IVA is verified. Without that, you'd have to charge Spanish IVA. It's worth setting up the ROI before issuing the first invoice.
You have to be registered in the ROI and have a NIF-IVA, with the registration active on the invoice date. For B2B services the invoice goes without IVA (the client accounts for it) and the operation is declared in the modelo 349. You can verify your number and the client's in the EU's VIES system.
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