For every customer from a country inside the EU we are obligated to add the VAT tax. The VAT is different for each client based on the one from his/her home country.
For orders from Countries outside the EU we are not obligated to add the VAT tax.

If you are an EU Company read this article.

If you are an Italian Company you will receive an electronic invoice. Based on Italian law we are obligated to add the VAT tax.
If you are a Company Outside the EU we are not obligated to add the VAT tax.