The MyCRM eTax solution is a tax calculation add-on for Microsoft Dynamics CRM.
It really does help when you get the numbers right...
eTax is an extension to the way Opportunity, Quote, Order and Invoice records calculate sales tax or VAT and allows an end user to select a VAT or Tax Rate for the particular Opportunity, Quote, Order or Invoice record as it is being created.
The only change to the Opportunity, Quote, Order or Invoice screen is the addition of a look up field for the appropriate VAT or Tax Rate.