Short answer: US citizens/green card holders keep FBAR, FATCA and related duties after a second nationality. Report foreign accounts over thresholds. A second passport is not an exit from the US tax net.
FBAR/FATCA for US Persons with a Second Citizenship
Written by Global Immigrate consultants · Reviewed by Oscar Yip, Founder & Managing Director
Summary
Second nationality does not end US reporting duties.
FAQ
Green card holders file FBAR?
Yes if account thresholds are met.
After dropping the green card?
Exit procedures and residual duties — ask a tax professional.
CBI bank accounts reportable?
Foreign accounts over thresholds may be.