I really should have tested the report more thoroughly. Turns out "Vendor Credits" do not pull into the report. Also, if you divide your bills across multiple expense accounts (or even have the same expense account, but for a different description/class), the report also duplicates those lines. Some clean-up is necessary, even on this report. Ugh. I would have deleted my original post so I could post again some time later after further testing, but apparently I can't do that. More updates to come, I guess.