[colejohnson66]

You can't renounce your US citizenship for quite a while after you leave. During that time you have to pay US taxes.

[int_19h]

Or without paying a fee. Which is currently $2,350.

(Ironically, you have to pay more to renounce US citizenship, then you have to pay in all the various filing fees etc when acquiring citizenship through naturalization.)

[cbd1984]

As a practical matter, you can evade US taxes if you have no financial contact with the US; the IRS can deem you liable for any amount of taxes and it won't have any effect on you if they're unable to collect them.

[colejohnson66]

But if you have family you left in the US, you're almost certainly gonna have financial contact with them.