I have used input sheets as a sorta kinda organizer for my very less than organized S-Corp, Partnership & Corporation. It has last year's numbers and a place for them to put their less than creative this year numbers. At least they were not my numbers. 

Back in the day - Input sheets were cut & pasted for the K-1 input on the 1040's. A very organized Lacertian from Sebastopol California submitted them to Larry & his cohorts and it showed up as an input sheet the next year. 

Oh boy, does that bring back memories. CP/M, 5.25 inch DS/DD floppy disks, Kaypro, Printronix Line Printer, 3 part pin fed carbon printer paper, a machine to separate the carbon paper out, with later NCR paper we had a burster, to separate the sheets, a huge table to collate the 3 copies of the tax return (praying Mike didn't get Beatrice's Schedule A, since not everyone got every form), leaving at 2 in the morning to be back at 8, ... Ah! the memories. It did beat the cost and time lag of a service bureau (send UPS on Monday, get it back on Wednesday, send corrections on Thursday, ...)