That's not the hard part of the VAT rules. If it was just asking the user what country they're in and then submitting sales figures by country, that'd be easy.
There are two hard parts to what the EU did, for businesses.
The first is you have to charge variable VAT rates and remit the collected tax. However VAT rates do vary not only by country but in some cases within countries too, and they do change, so you have to make sure you have a really up to date list of tax rates and geographies where they apply. Including varying rates down to the city levels.
But the real kicker is that you can't trust the user's claim about where they are. Users are financially incentivised to lie about their location because these are digital downloads. So if they claim to live in a low VAT region they pay less, but download the same files. Simple as that.
As a consequence the VAT regulations have a LOT of complicated edge cases and "guidance" in them about how to figure out where the user really is, not where they say they are. This is hard of course, the user may be using VPNs and so on. There is specific guidance on how to handle users who are on ships sailing between VAT regions, or planes that are in the air when a purchase is made. So you've got a really complex pile of logic to start with, and then you're also in an adversarial situation where the users are all trying to screw you over by forging their location. And if they succeed, you can suffer big fines.
Oh and finally of course, you can't use any technical tricks to figure out where the user actually is, because then you'd violate EU privacy laws ... have fun with all of this! In practice it has to all be outsourced, it is too much work to implement in house for all but the largest of firms.
There are two hard parts to what the EU did, for businesses.
The first is you have to charge variable VAT rates and remit the collected tax. However VAT rates do vary not only by country but in some cases within countries too, and they do change, so you have to make sure you have a really up to date list of tax rates and geographies where they apply. Including varying rates down to the city levels.
But the real kicker is that you can't trust the user's claim about where they are. Users are financially incentivised to lie about their location because these are digital downloads. So if they claim to live in a low VAT region they pay less, but download the same files. Simple as that.
As a consequence the VAT regulations have a LOT of complicated edge cases and "guidance" in them about how to figure out where the user really is, not where they say they are. This is hard of course, the user may be using VPNs and so on. There is specific guidance on how to handle users who are on ships sailing between VAT regions, or planes that are in the air when a purchase is made. So you've got a really complex pile of logic to start with, and then you're also in an adversarial situation where the users are all trying to screw you over by forging their location. And if they succeed, you can suffer big fines.
Oh and finally of course, you can't use any technical tricks to figure out where the user actually is, because then you'd violate EU privacy laws ... have fun with all of this! In practice it has to all be outsourced, it is too much work to implement in house for all but the largest of firms.