[_delirium]

The main thing the EU did to simplify that is require one set of VAT rules per country. They can differ. For example, Denmark charges VAT on books, while the UK doesn't. And, like with the proposed US legislation, it's based on destination: if you order from amazon.co.uk to a Danish address, you pay VAT based on Danish rules.

But what can't happen is a situation where Herning, Ishøj, and Copenhagen charge different rates for different products. That simplifies the system considerably.