I filed withyou and forgot a 1099-int

 

After you file

If you haven't filed yet, you can add it to your return before you file. See the following:

https://ttlc.intuit.com/replies/3300478

If already e-filed and pending, you need to wait until it is either accepted, or rejected.

If rejected, you can update your return and re-file.

If accepted please see the following regarding amending a return: