You may need one, the other, or both. FBAR is filed with the Financial Crimes Enforcement Network (and is based on calendar year), whereas Form 8938 goes to the IRS as part of your federal tax filing (and is based on your chosen tax year). FBAR is judged based on foreign balances controlled by your US entity's foreign accounts or its controlled entities foreign accounts, whereas Form 8938 is judged based on a threshold of specified passive income. See here for more details: https://www.irs.gov/businesses/comparison-of-form-8938-and-fbar-requirements
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