Here's the gist of it for UK startups as I understand it: 1) If you're already VAT registered, this isn't really adding much work. Just track IP address and c

Here's the gist of it for UK startups as I understand it: 1) If you're already VAT registered, this isn't really adding much work. Just track IP address and credit card address for the sale (you probably are anyway). Your accountant can take care of the rest. 2) App store sales are unaffected as long as they are collecting the VAT for you. As far as I know, both Google and Apple do this. 3) If you are not VAT registered and are under the threshold of £81k/yr. You have two choices: Register and go through all the compliance (this is a pain). Or don't register, then block all non-UK EU countries from buying. You can still accept UK and other countries such as the USA, but the moment you make a cross-border transaction into the EU, you will have to register for VAT, start charging VAT and filing quarterly reports. I assume that other countries with VAT thresholds will be similar, don't sell to EU countries other than your own and you should be fine. Although obviously check with your accountant first!