The IRS instructions for the form (Instructions for Form 8621) permit it to be filed as a stand-alone form only for taxpayers who are not required to file a tax return.
If you electronically file your tax return using TurboTax, and you do not include this form, you would need to attach it to an amended tax return, Form 1040X.
Alternately, you could attach it to a paper filed Form 1040 but if you have tax due, you would need to override calculations on your tax return since TurboTax does not support this form in the software.
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