This is correct. Installment sale should be reported on Form 6252 and informational Form 8594 should be added to the return. However, the Form 4797 and Schedule D also need to be created to report gain and loss on the sale.
What is IRS Form 6252: Installment Sale Income
Installment Sales
Please, double check your return, and if you sure there is no such forms, contact TurboTax customer service before you file your return.
