The fact that US income tax is lower than those in most other countries means that such people will almost never paying any actual tax -- and, believe it or not, are even entitled to a tax refund from the US government.
So yes, it's a pain that the US makes me file tax forms every year. Or more realistically, the US makes me pay an accountant to handle this for me. But the odds of my having to pay income tax to the US are pretty slim, until/unless I'm making a ton of money, in which case I'm sure that my accountant will think of new clever ways to avoid doing so.
Not to the US, at least, but to the other country, yes. So going abroad is not a way to save money on taxes.
After you exhaust the foreign-earned income credit (which is roughly 90K), you're basically paying the higher of US and local tax. And it's not always lower e.g. Americans in Hong Kong will end up paying tax.
I've never heard of anyone getting a refund from this.
From the IRS website:
> Your foreign tax credit cannot be more than your total U.S. tax liability multiplied by a fraction. The numerator of the fraction is your taxable income from sources outside the United States. The denominator is your total taxable income from U.S. and foreign sources.
So no, one is not entitled to a tax refund, because the credit cannot be more than the total U.S. tax liability.
http://travel.state.gov/content/passports/english/abroad/leg...
I don't know the details for people who have never lived in the US, but they are entitled to vote, being citizens.
Being forced to pay taxes is an unwelcome burden with few benefits, but you can vote if you live abroad.
Apparently even in the US the Democratic National Convention gives state-level recognition to Democrats Abroad, an organization for overseas Democrat voters.
Back on topic, I generally feel a little uneasy with the question of the migrant vote. Denying the vote to emigrants? Not good. Denying the vote to immigrants? Not good. Migrants (with inherently less commitment to a single state) effectively getting more votes per capita than non-migrants? Not good either! This is certainly just a highly abstract problem that probably deserves quotes ("problem"), but it should not be completely ignored in a world of ever-increasing international mobility.