Not having a US passport doesn’t mean anything concerning your tax obligation. You can be a US citizen without having a passport. The tax obligation is purely based on your US citizenship. Check here what the rules are on citizenship through parents.
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Find out in 2 minutes whether the IRS considers you a “US Person” and whether you may be required to file a US tax return — even if you live outside the United States.
When are you considered a US person (and taxable)?