Mereguemeringue My paperwork used to be everywhere, often in piles on all surfaces. During kondoing I slung a lot, went through the dozen or notebooks I found and tore out old pages and stashed now clear ones in a drawer for future use and organized the rest of my paperwork like this...
First, I use a 5 subject file in a basket (actually it's 3 plastic basket nested together, but the 5 subject file is in the top one), you may need more or less files, any accordion or drop down file as having it all together really helps me. My 'subjects' are sentimental, money coming in, money going out, legal paperwork, and medical. A separate file elsewhere has the housing paperwork.
In front of the file is paperwork that needs to be dealt with and my planning notebooks and organizer, behind the file is copies of DP and mine's wills which don't fit in the file and currently two binders I'm dealing with. In the second basket underneath is all my writings and notes and leaflets on my current project, third basket I keep general business and future idea stuff and extra empty files. The basket is wide enough that in the top file next to the nice vertical pile 
of paperwork, files, and binders is room for pencils, tape, a spare reporter notebook for scrap paper and notes, post-it notes, and similar.
Never has my paperwork been neater, more contained, or easier to deal with!