With further review of your follow-up question, Form 8938 won't be available until 2/4/2021. Therefore, it was not attached to your tax return when it was e-filed. It is possible that the IRS will reject your return. If it is not, you can amend your return as long as it accepted by the IRS; in other words, the e-file cannot be pending. Since Form 8938 is an informational form, it will not effect your tax calculation and as long as you amend the return before the deadline, there will be no penalty. Lastly, amendments are free in TurboTax.
To amend your 2020 return, please follow the directions on the How do I amend my 2020 return?
To see IRS form availability, please go to IRS forms availability.
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