> For example, in the EU I believe you need to register your business and collect VAT. There's also inquiries from Taiwan, Canada, and Australia If it's a SaaS

> For example, in the EU I believe you need to register your business and collect VAT. There's also inquiries from Taiwan, Canada, and Australia If it's a SaaS this applies. For mere licensing of software I don't believe it is clear cut, and maybe if it's not "mandatory" they might want it for tax streamlining. For EU you certainly don't have to register it on every country, an invoice from one country is accepted in all countries. Easiest way? Sell it through a 'store' like Windows Store, Mac Store etc. Not sure there's something like Steam for 'serious software'.