2019 Form 1040X is available now.
When you file an amended return, be sure that you select Amend this return before you add the missing 1099-R. Without clicking to amend first, your starting point will change. Then, you would have the beginning and ending be the same, and the change will not be properly captured on Form 1040X.
The links for amending 2019 walk through this procedure and depending on if you originally filed online or with desktop, you can click what is applicable to you.
You will need to file an amended state return to capture the additional Form 1099-R which could affect the refund you have already received.
The amendment is mailed in. It takes 16 weeks to process.
To track the amendment, go to Where's My Amended Return?
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