It's not quite that simple.
If the customer is in the UK they are charged VAT.
If they're outside the EU they're not.
If they're inside the EU but outside the UK they're charged VAT unless they supply a valid VAT registration number.
VAT can be 17.5%, 0% or (if memory serves) 5% depending on the nature of the product. Fortunately for me all of my employer's products and services are at the standard rate; however we will likely be doing business with companies in the EU and will need to charge them 0% if they supply a valid VAT number.
Can nopCommerce handle this scenario out of the box or will I need to write some code?