Was this an installment sale? You do not include the interest on Form 6252. Include it on Schedule B like any other interest.
Enter the amount of interest received into TurboTax as if you received a 1099-INT under the "Personal Income" tab. Enter the name of the party that the interest was received from in the "Received from" field, and the dollar amount of the interest in the "Box 1 - Interest Income" field.
This will correctly report the interest income on your Schedule B.
@cturnquist
