@Taxachusetts I don't think the page orientation has anything to do with it. What we see visually on our screens is the data presented in a format we can understand. An electronic data file has fields and values in them and is pretty much in a compressed format that we would have a hard time reading or understanding. That same electronic data can be presented in any page size / orientation / font desired.
What I would venture to guess is that the IRS published the visual format for Form 1116 and its Schedule B (you can view and download the PDF forms from the IRS website) but it has not published the electronic format / data fields for the said Schedule B so that tax filing applications such as TurboTax to feed the relevant data into.
Based on what I've read in this thread, the IRS is prepared to accept a PDF of Form 1116 Schedule B but TT has (possibly) yet to figure out how to append a PDF (a visually formatted file) to a data file. If other tax filing applications such as Online Taxes (OLT) has figured that out, TT should too if they put resources to it.
