You have to file your US income taxes regar

You have to file your US income taxes regardless if you retire, live, or work abroad. US citizens must always file their taxes. Living abroad does not make a difference. You still have to file your income tax without exceptions.
 
For our US taxes, we use an accountant who is still in the US and who is familiar with international law. We also have a Panamanian accountant who is familiar with international law who helps us file our Panamanian income taxes.
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