It is very complex material. All depends of your specific situation and your specific wishes. There is no overall solution that fits for all.
There are possibilities to first get confirmation that you can get citizenship in country A before giving it up in country B. So risks are very limited in that case.
Both are very limiting. Roth's have very low max income thresholds. SEP's need big DECLARED taxable self employed income to make them worthwhile.
You should all consider that this thread is monitored by the IRS, before you get a $99.99 tax penalty, that you could not pay anyway.
I don't think they monitor it, they already know the reputation of the ET members. Maybe they caught Marketsurfer??? Might explain his disappearance. Besides I don't live in the US.
Shore Leave / For 'anchor-outs,' home has no rent, no mortgage . . . and no frills http://www.sfgate.com/bayarea/article/Shore-Leave-For-anchor-outs-home-has-no-3302454.php
Oh, I get it. The real advantage to living on a boat would to enjoy an ocean front living lifestyle without dealing with the real estate costs - indeed the advantages are obvious on the coast of California or many parts of Florida. It would have to be a clime where the harbor didn't ice over. Again, you are still going to have to pay taxes if you are a US citizen. If you renounce your citizenship and choose to remain - well, that would catch up to you as well. This is a silly conversation frankly.