[charlesdm]

This depends highly on your country of citizenship, as well as country of residence.

Americans have it different than most others, because they are taxed globally.

A true 'digital nomad' without set residency somewhere might also encounter problems, because certain countries might challenge the tax treatment of certain transactions. (depends on if you're selling your own stuff, or doing consulting, for example)

Talk to a lawyer (or law firm), see legal500.com (-> tax) for some recommendations. A firm in the country you're currently residing in is a good starting point.