If you have not filed your return, you can go in and change it before filing.
If you have already filed your return, you will need to amend.
You can track your refund from the original return at Where's my refund.
Once your return is accepted and the finances are settled, you can file an amended return. See how to file an amended return.
Three weeks after you mail your amended return securely with tracking, visit track an amended return
See also, I need to amend my state return.
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