[Denvercoder9]

> If they have to collect vat, they need separate transactions

At least in Europe that's not true. If I buy milk (6% VAT) and beer (19% VAT) in the supermarket here (The Netherlands), I don't have to split that in two transactions.

[LoSboccacc]

sure it's true for goods and services if sold to a single state, but if you sell across state boundaries you're required to register and pay your vat to each state where the sale happened and track those transactions along with the source