It's possible that this could cause the government to reject your return, but you won't know for certain until after they process it. The IRS begins processing 2020 returns on February 12, 2021. At this time, they will either accept or reject the return.
If accepted, you can amend your tax return to include the correct Defense Accounting Finance Service 1099-R FIN number. You'll find assistance with amending a return here: How to amend (change or correct) a return you already filed
If rejected, you'll be able to revisit your return to add this number. Refer to the following Help Article for help with fixing a rejected return: How do I fix a rejected return?
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