AFAIK in US, you just treat affiliates like independent contractors. You collect W9 or W8-BEN, and there's no tax withholding or extra taxes. Most importantly most software help you automate admin workflow.

>And is EU law the issue or really 'local law'? A little bit of both. Basically different nationalities have different tax calculations and documentation required. Plus, there are extra taxes that'll eat up our margin significantly.

We are consulting professionals of course, just want to get some tips from those who might've dealt with it. (I'm also slightly worried that tax/legal professionals, especially outside of SV, don't always have full grasps of these practices.)