If you're running EU-registered business there are some strict tax rules to follow, but with HostBill its easy to fulfill them.
Go to Settings->Tax Settings and configure general tax config to match image below:

Next you need to add tax rate for each EU-Member countryto do so in Settings->Tax settings use option "Add new tax" (note: set up your country vat rate for each country). Faster way to add all rules is to use sql - invoke this queryon your HostBill db (make sure to update tax rates in query to match your requirements first)

Go to Clients->Registration Fields and from "Premade field profiles" select "European Business" profile. This will automatically add VAT-EU field. You can also manually add VAT-EU to your registration fields, just make sure that this field applies to Company and set variable name in Advanced tab to vateu

Go to Extras->Plugins->Inactive and activate "VIES VAT number validation".
Set field variable name used in Clients->Registration Fields (vateu in most cases).
Enter your country iso code (use GB instead of UK if you're located in Great Britain).
