While that's true, you COULD e-file your federal and state without the 1116 Schedule B, then on March 31 file an amended federal return via mail. If I did that, I don't think I would need to file an amended state return because the 1116 Schedule B doesn't affect my state taxes. So, that would save one mailed package, and also get the majority of my refund to me much faster (since only the portion affected by the Schedule B would be put on the IRS' 10 month backlog).
