Pomatio adds a few extra taxing features that you might need for your store.
Extensions available for taxes:
This extension adds to your checkout a field to collect and validate a customer’s EU VAT number if they have one. Upon entering a valid VAT number, the business will not be charged VAT at your store. The validation is done using VIES. More info →
Add a special tax that can be enabled on a per-customer basis. For example, some of your customers might need an equivalence surcharge tax. With this tweak you can do just that: edit their customer profile, activate this tax for them, and they will be charged this extra tax at checkout. More info →