If you are operating in the EU then we are required by European regulation to charge VAT. The VAT charged depends on the location of the buyer. 

If you have a valid VAT number, the VAT may be reverse-charged. This also depends on your location. 

During checkout, enter your company name, country, and VAT number. The price will automatically update to show the correct amount. If applicable, the notice "EU VAT reverse charged" will be printed on the invoice.