After you file

You cannot.

 

If you or a dependent that you are entitled to claim has already been claimed by another taxpayer, your e-filed return will reject since the SSN has already been used (either intentionally or in error such as a mistyped SSN).

Your only recourse is to file a correct tax return, claiming what you are entitled to claim, then print and mail the return.

**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**