In practice, you need to learn the tax code to find most suitable form of conducting business. For example, in the UK if you know what you're doing, you'll pay

In practice, you need to learn the tax code to find most suitable form of conducting business. For example, in the UK if you know what you're doing, you'll pay ~20% tax on your income as a contractor. If you don't, you can easily end up paying something like 30+%. Also, there are perpetual costs of having a company registered (such as monthly payments to an accounting company which handles paperwork, health care contributions etc.), so if you move around regularly between a couple different countries, you'll probably need to maintain a legal presence in each one, and thus have these costs multiplied.