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As long as you keep your greencard, you still need to declare your income worldwide.

Depending on your home country, having US passport opens up a lot of other possibilities for travel too.

Furthermore if you have held* a green card for the last 8 (of 15 years) i.e. you hold permanent resident status you also become in-scope for the tax expatriation law that apply to US Citizens, and possible ongoing declaration requirements: https://www.expatriationattorneys.com/green-card-u-s-exit-ta...

I've never been US-resident; the reason I know about this is talking to someone who relinquished theirs when I asked if they could keep it.

*from the U.S. Government's point of view.

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