If you are a german tax subject (and received thaaaat number) you will be liable to german taxes - unless taxed otherwhere. The "perpetual traveller construction" doesn`t work anymore. ANd if you are switching residence all the time, you are considered to be just that - travelling. The "Steufa" only will let you get off the hook, if you have migrated for good - with no intense to return, no keys for your parent`s home etc... You need a proper tax residency (more than 6 mths, otherwise brokers/banks...won`t be reliable partners ( money laundry, patriots act..). Even if you own that big "customers yacht" - it won`t be an acceptable residency for brokers or banks - not to speak of health insurers etc. Taxwise there are many countries within the EU with low or zero taxation on trading / capital gains profits. And a last warning: The devil is always in the small print, especially at tax evasion. And life ain`t easy for a german expat, even in Switzerland or Austria - not to speak of SG , HK or Dubai. Regards Hittfeld