My thoughts are this,although its technically possible l guess to travel the world use a computer for work and pay no tax etc......what about were you are going to get medical care,your pension in old age.....welfare if ever needed and other stuff.
The reason l say this is because although you travel you ususally have a home base ...and thats the place that will be asking questions.
I did simlar ,I spent a few years in asia travelling ,using my pc etc.....but once l was back in the UK and started to work there ,l was asked questions like ..what have you done for the last 5 yrs...it didnt impress the tax office when l told them l had just hung out in asia etc......
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