There are countries like the Bahamas and Bermuda which are genuinely tax-free for trading income (and a few others - a Google search will produce them easily enough). The Bahamas is very hot and accommodation-costs in Bermuda are almost unbelievably high!
In Malta (mentioned above), the tax department has recently confirmed that it regards trading income as arising within Malta for income tax purposes if the "actual trading work" is done within Malta, regardless of where the accounts are held and from where the funds/profits are remitted. Income taxes in Malta are significantly lower (and offsettable allowances typically more generous) than in most of the Europe, but it's by no means tax-free.
The position in Portugal (also mentioned above) may be similar and the point hasn't yet been tested in court. (In theory, new immigrants' incomes remitted from overseas are income-tax-free for the first 10 years, but that's perhaps not intended to cover income arising from work done within Portugal, similarly to the situation in Malta.)
What all of these considerations illustrate is how essential it is to take proper, up-to-date, professional advice from someone both qualified and licensed to give it.
In Malta (mentioned above), the tax department has recently confirmed that it regards trading income as arising within Malta for income tax purposes if the "actual trading work" is done within Malta, regardless of where the accounts are held and from where the funds/profits are remitted. Income taxes in Malta are significantly lower (and offsettable allowances typically more generous) than in most of the Europe, but it's by no means tax-free.
The position in Portugal (also mentioned above) may be similar and the point hasn't yet been tested in court. (In theory, new immigrants' incomes remitted from overseas are income-tax-free for the first 10 years, but that's perhaps not intended to cover income arising from work done within Portugal, similarly to the situation in Malta.)
What all of these considerations illustrate is how essential it is to take proper, up-to-date, professional advice from someone both qualified and licensed to give it.