You don't include any of the Roth amounts as part of the conversion. That amount is considered a Roth contribution effective 2017. The original contribution has a basis of $1000; the growth on that amount does not increase the basis. The conversion of the other IRA amounts in 2018 add to the $1000 basis. Those amounts do include the growth, because the growth is taxable at the time of the conversion.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
