If your Efile is Rejected, you can open your return and make your changes and Efile again.
if your Efile is Accepted, you may need to mail in an Amended Return if the change makes a difference in your refund.
Here's how to Check your Efile Status.
Click the link for more info about Amended Returns.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"