If your aim is to pay 20% then that's quite easy. Countries like Estonia (20%), Latvia (15%), Romania offer this and the first two don't have any security issues. All countries have their peculiarities, which I'm not going to talk about, Deloitte's leaflets are available online and offer good (and reliable) information.
Probably, someone already had a similar issue before like us, e.g. http://www2.deloitte.com/global/en/services/tax.html?icid=bottom_tax
For comparison of income(CapGainTax) tax rates for each country, this consulting is helpful to SportsStar (soccer) with huge income.
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