If you have already filed and received an "Accepted" notice. Then, you can amend your tax return. Select Yes you will need to amend Federal return.
You will have to wait to make any change If you are still waiting for the notification of your filed tax return status either "Accepted" or "Rejected.
If your return is Rejected, you can just go in and fix the issue and update the mortgage information. Then, e-file it again.
See helpful information on how to amend your tax return below. https://ttlc.intuit.com/replies/6603004
