VAT tax already included in product price!!

[Nandani]

With reference to discussions on  Tax in ML group, i learned that different
tax percentages can be applied on different products but that too based on
categories and GeoId and TaxAuthPartyId is specified in store.
I want to display in invoice  VAT TAX on different products with different
tax percentages and tax is already included in price.
Any idea how it can be done?

Any help will be appreciated..

Thanks
Nandani