Can I attach a supplementary schedule to a return I plan on E filing?

[dennisgiuffre]

I am trying to attach a stock basis calculation for a S-Corporation shareholder with respect to unallowed business loss from Sub S corp for 2019

[Critter-3]

That  is not part of the tax return ... supply that information directly to the shareholder with the  K-1. 

[Anonymous_]

You will not be able to e-file; you will have to print and mail your return.

[Anonymous]

you can use form 6198 at risk. if the S-corp losses and deductions exceed basis. then no supplement should be needed. 

[dennisgiuffre]

Thanks for the info!

Dennis