Can I make 2 suggestions:

1. That an additional field is added to the Company Information - VAT/Tax #:  Legally the VAT number needs to appear on every invoice in the UK. At present the only way to do this is use one of the Company Information fields - in our case the address field. We then use the city, state and post code fields for the address.  Another field for Company Registration #: would be helpful as well as this again is a requirement for display.  Perhaps 2 "Additional Custom Fields" ?

2. Allow for cross tax charges across multiple countries.  i.e. If a product is sold in the UK then 17.5% VAT is chargeable.  If a sale is made to another company in a country in the European Union and they provide a VAT number then NO VAT is chargeable, if they do not provide a VAT number, or it is a consumer purchase then VAT is chargeable and in some cases at the local country rate. The local country rate can vary - 10% - 25% depending on the country and their rates of VAT for that particular product or products.  Every sale OUTSIDE the EU does NOT incur VAT. For example - a customer wishes to make a purchase from the USA and have delivered to the USA - VAT is NOT chargeable on that order to that customer.