I keep each months budget, bills paid, important letters in plastic bags labeled with month/year. I keep each year in one box. I have 20+ years of these boxes. So I went through the oldest and culled out power bills, water bills, normal monthly bills. Shredded them. Then went through what was left. Tax documents, receipts for things I still own, those I moved into a file cabinet. Now there are only three full years of all budgets/bills in 3 boxes. These will be easier to move, once my new home begins again to build.