If you are not sure whether you will file an extension the safe method is to select the checkbox and enter your form (1040). There is no harm if the return does get filed on time, it will still connect with your Form 3520.
Note. If a U.S. person is granted an extension of time to file an income tax return, the due date for filing Form 3520 is the 15th day of the 10th month (October 15) following the end of the U.S. person’s tax year.
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