On: How does Google pay 2.4%?

[mahyarm]

I also want to note that the USA is the only country in the world to base income taxation on citizenship/green card and residency, vs residency only for the rest of the world. Be a citizen of anywhere else and you can be really tax free/low tax.

[travisp → mahyarm]

Not only does the US tax its citizens who live and work abroad, it will also do so for 10 years after one renounces citizenship.

[Jach → travisp]

How do they enforce that one, or even get a hold of your income to know how much they're missing out? Or is it just a general "set foot on this country again and it's prison time for you"?

[mahyarm → Jach]

You have to submit accurate tax returns with possible audits resulting extraditions and criminal charges if you don't. And there is FBAR.