Yes, you need to file an amended tax return for 2017 by filing form 1040X. As you have double-counted the deduction,. you would have to pay additional taxes. With your amended return, you need to enclose a check for the amount indicated on the form 1040X. In the explanation for the amendment, state that you did it by error. The IRS may waive penalty and interest if this is a small amount.
Please see the
following TurboTax FAQ for
instructions on how to amend your 2017 tax return in TurboTax.
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
