Countries want to avoid that a foreign supplier who delivers from abroad does not pay VAT at all.
The foreign supplier must issue his invoice without VAT, and the importer declares and pays the VAT (no matter if the importer is registered for VAT). If the importer is registered for VAT, he can deduct the amount as input VAT.
Therefore, in an international context, a tax-free delivery of goods or services should only be done to enterprises. The entrepreneur (contractor) status in the EU is defined by an international VAT number which can be verified at the VAT Information Exchange System (VIES). Companies in countries outside the EU may submit other evidence of entrepreneurship instead of an international VAT number.
Some countries have thresholds for purchases of services, so a private recipient, a company that is not registered for VAT purposes or a company that is partially exempt for VAT purposes can receive services below this threshold without declaring and paying local VAT.
If there is a national delivery from another country to a destination in the same country, a national VAT number of that country is required.
Ancillary services receive the same VAT treatment as the main supply.
Suppliers of goods or services with “Reverse Charge” system are required to submit a periodical “Recapitulative Statement” with a breakdown of all customers, their VAT numbers and the total amount of goods or services provided to them within the last quarter. These data are collected for all member states in the VIES system for control purposes.