This will effect both State and Federal.
You will need to file a paper return because there is no way to get around the e-file system once your dependent has already filed and claimed themselves. Paper file your return with your dependent included.
This article will give instruction on how to print and mail your return.
Your dependent will need to amend their return to indicate someone else is claiming them.
See this TurboTax FAQ for help with amending.
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