Comment 11 for bug 121510

I use the Balance report for just this purpose; I have my scheduled transactions automatically post a year in advance so I can see them in the register, so maybe that's a workaround.

If you want your scheduled transactions to sit in the bottom window until you're ready to post them, and if that affects the Budget report's ability to see the effect they have, then this won't work for you. YMMV. :)