supermaria

Hi, I am based in the UK and own a small design agency (also registered in the UK). I am currently not registered for VAT as my turnover is way below the threshold. I am offering digital design services (website design, graphic design, design consultancy, illustrations) and my designs are personalized (so I assume they don't qualify as digital products such as ebooks). I have two questions: 1. I would like to know more about selling these services to the EU based business customers - who's responsible for VAT? Are there any other taxes or rules I should be aware of in this case? 2. Same question, but what about US based business customers? Anything I should be aware of? Kind regards, Maria