At least one applicable VAT rate for each of the 27 EU countries is simple enough to implement yourself. The US has a mess of thousands of jurisdictions with th

At least one applicable VAT rate for each of the 27 EU countries is simple enough to implement yourself. The US has a mess of thousands of jurisdictions with their own taxes, where it's difficult to even tell in which jurisdiction an address falls, so you're pretty much forced to use a service like Avalara.