How can I generate Form 8866 and how many forms can I e-file in a return?
Form 8866 – Interest Computation Under the Look-Back Method for Property Depreciated Under the Income Forecast Method is available in 1040, 1120, 1120-S, and 1065 returns.
To generate the form, go to the Other Forms tab > 8866 screen. Form 8866 cannot be e-filed if it has a refund (note 339), or if otherwise choosing to file separately from the main return. Only one Form 8866 can be generated and e-filed for each return.