How does my son complete the 1040X to amend that he can be claimed as a dependent? He did not check the box on his original return. 1040X is confusing for this situation.

[VolvoGirl]

By the way, did your return reject because he claimed himself?  Just checking, you know you will have to mail your return this year.

[MinhT]

To indicate that your son can be claimed as a dependent when amending his return. visit the My Info section by clicking on My Info in the left-hand column. On the Personal Info summary page, click Edit next to his name and change the check boxes in question 3. A few other things we need to know as in the attached screenshot.

This is all you have to do if you do not have any other changes.