I don’t think there’s an easy way to do what you’re asking–I tried playing around with different reports, dummy Fills, etc. but none of the solutions seemed any easier than just doing the math by hand. The “Spending vs. Budget” report is a nice way to visualize the data, but 1) it doesn’t total them by +/- and 2) it only reports the last complete budget period.
“Spending by Envelope” comes close and may be more helpful for future budgeting in the long run, but it’s tedious to extrapolate just the most meaningful envelopes since there doesn’t seem to be a way to either exclude some or include several selected ones.
In the “ideal” world of budgeting, you’d move money from your overfilled envelopes to your underfilled ones as soon as they went red but I work the way you do–some of my envelopes always go negative (I’m looking at you, Dining Out) and I just clean them up at the start of the next budget period. It’s a luxury to be able to do that, I know, but it’s easier for me that way.
I can see how this would be a nice feature to include, and if you want to suggest it the Goodbudget Admins are great about reading our emails and adding things to the queue for consideration. You can find instructions for that here.
Sorry that’s not more helpful though!